CRSI_ Reinforced Concrete Terminology
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CRSI: Reinforced Concrete Terminology
Reinforced Concrete Terminology
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A
AASHTO—American Association of State Highway and Transportation Ofcials.
ABUTMENT—Supporting subsructure at ends of bridges.
ACI—American Concrete Insitute
ANCHORAGE—The securing of reinforcing seel in concrete either by sraight embedment, hooks, or headed bar
ANSI— American National Standards Insitute
ARC WELDING—A process by which the two pieces of seel to be joined are heated by an arc formed between an electrode and the seel. As
the electrode melts, it supplies weld material which fuses the pieces of seel together.
ARCHITECT—A person or frm who prepares the architectural drawings that determine the design and form of buildings. The Architect is
usually employed by and represents the Owner.
ARCHITECTURAL DRAWINGS—Drawings which show the general design and form of sructures by means of elevations, plans and sections;
show the various materials such as brick, concrete, glass, masonry, seel, sone and wood and their dimensions; show fxtures and fnishes for
ceilings, foor surfaces and walls.
ASTM—American Society for Tesing and Materials.
AWS—American Welding Society.
AXLE-STEEL REINFORCING BARS—Deformed reinforcing bars rolled from seel axles for railroad cars.
B
BACK UP BARS—See GRILLAGE BARS.
BAND—Group of reinforcing bars disributed in a slab or wall or footing. See STRIPS.
BANDED TENDONS—Presressing tendons which are grouped into a narrow “band” 3 to 4 feet wide over the columns. Tendons in the
perpendicular direction are spaced uniformly.
BAR—Steel bar used to reinforce concrete. See REINFORCEMENT.
BAR-END CHECK—Check of the ends of reinforcing bars to determine whether they ft the devices intended for mechanically splicing the
bars.
BAR LIST—Bill of materials, where all quantities, sizes, lengths and bending dimensions of the reinforcing bars are shown.
BAR NUMBER—A number, approximately the bar diameter in eighths of an inch [whole millimeters], used to designate the reinforcing bar size.
For example: A #5 [#16] bar is approximately 5/8 inch [16 millimeters] in diameter: a #9 [#29] bar is approximately 9/8 inches [29 millimeters]
in diameter. Bar numbers are rolled onto the bar for easy identifcation.
BAR OFF—Unloading reinforcing bars from a truck bed by levering individual bundles over the side with pinch bars.
BAR PLACER or PLACER—Worker who handles and places reinforcing seel and bar supports. See IRONWORKERS and METAL LATHER.
BAR PLACING SUBCONTRACTOR—A contractor or subcontractor who handles and places reinforcement and bar supports often colloquially
referred to as a “bar placer” or “placer.”
BAR SPACING—Disance between parallel reinforcing bars measured from center-to-center of the bars perpendicular to their longitudinal
axes.
BAR SUPPORTS—Devices of formed wire, plasic or precas concrete, to support, hold, and space reinforcing bars.
BASKET—Wire assembly to support and space dowel bars along the expansion joints in concrete pavement.
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CRSI: Reinforced Concrete Terminology
BEAM—A horizontal sructural member supporting loads from a foor or roof sysem to columns, girders or walls.
BEAM AND SLAB FLOOR CONSTRUCTION—A reinforced concrete foor sysem in which a solid slab is supported by beams or girders of
reinforced concrete.
BEAM BOLSTER—Continuous bar support used to support the reinforcing bars in the bottom of beams.
BEAM BOLSTER UPPER—Continuous bar support for the upper layer of bottom reinforcing bars in beams and top reinforcing bars in bridge
deck slabs.
BEAM SCHEDULE—Table on a placing drawing giving the quantity, size and mark number of beams; the quantity, size, length and mark
numbers of reinforcing bars and sirrups (including sirrup spacing), and, where specifed, the sirrup support bars and beam bolsers.
BELLED—Having a butt or bottom end shaped like a bell, often used on concrete piers or caissons.
BENT—A self-supporting reinforced concrete frame with one or more columns, usually at right angles to the length of the sructure it supports.
Example: The columns and cap supporting the spans of a bridge is called a bent.
BENT BAR—A reinforcing bar bent to a prescribed shape such as a truss bar, sraight bar with end hook, sirrup, or column tie.
BENT CAP—A reinforced concrete beam or block, extending across and encasing the heads of columns, comprising the top of a bent for the
bridge span above.
BILL OF LADING—A lis that gives each part or mark number, quantity, length of material, total weight, or other description of each piece of
material that is shipped to a jobsite.
BILLET—Piece of semi-fnished seel, nearly square in section, formed by hot-rolling an ingot or bloom, from which reinforcing bars are rolled.
BOLT CUTTER—A tool used to cut reinforcing bars on the job-site. Smaller (wire) mesh cutters are used to cut welded wire reinforcement or
bundle wires.
BOND—Holding or gripping force between reinforcing seel and concrete.
BOX CULVERT—A tunnel-like reinforced concrete sructure consising of single or multiple openings, usually square or rectangular in cross
section.
BOX GIRDER—A bridge having a top and bottom slab with two or more walls forming one or more rectangular bays. The wall heights may be
variable in order to provide an arched bottom slab.
BRACKET—An overhanging member projecting from a wall, column, girder, or beam to support the weight of a sructural member.
BREAK (A SPIRAL)—Opening a spiral to the round shape and forcing it toward the opposite direction that it was folded (collapsed) so that it
will remain circular for placing.
BUILDING CODE—Laws or regulations set up by building departments of cities, sates and Federal Government, for uniformity in design and
consruction practices.
BULKHEAD—Partition placed in a form to hold fresh concrete, earth, or water.
BUNDLE OF BARS—A bundle consiss of one size, length or mark (bent) of reinforcing bars tied together, with the following exceptions; (1)
very small quantities may be bundled together for convenience, and (2) groups of varying bar lengths or marks (bent) that will be placed
adjacent may be bundled together. Maximum weight of bundles is dependent on regional practices and site conditions. See LIFT.
BUNDLED BARS—A group of not more than four parallel reinforcing bars in contact with each other, usually tied together.
BURNING REINFORCEMENT—Cutting reinforcing bars with an oxy-acetylene torch.
BUTT-WELDED SPLICE—Reinforcing bar splice made by welding the butted ends.
C
CAISSONS—Piers usually extending through water or soft soil to solid earth or rock. Also cas-in-place, drilled-hole piles.
CAISSON—See DRILLED PIER.
CANTILEVER BEAM—Beam which extends beyond the supports in an overhanging position with the extended end unsupported. Similarly
such a slab is called a cantilever slab.
CARBON-STEEL REINFORCING BARS—Reinforcing bars rolled from seel billets in contras to rail or axle seel.
CAT-HEAD—A light frame and a sheave at the top of a material tower through which the lifting cable is operated.
CERTIFIED MILL TEST REPORT—A report from the producing seel mill lising the chemical analysis, physical properties, heat or lot number,
and specifcation used to manufacture the material.
CHAMFER—A beveled outside corner or edge on a beam or column, or a triangular wooden srip placed in the corner of a form to create a
beveled corner.
CHOKER—A sling hitch that is self-tightening.
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COLD JOINT—Consruction joint in concrete occurring at a place where the continuous casing has been interrupted.
COLUMN—Vertical sructural member supporting a foor beam, girder, or other member, and supporting primarily vertical loads.
COLUMN CAPITAL—Upper fared cone-shaped section (mushroom head) on circular columns; pyramid-shaped section on square columns.
COLUMN HORSE—Wood or metal supports, used in groups of two or more, to hold longitudinal reinforcing bars in a convenient position for
placing ties while prefabricating column, beam or pile cages.
COLUMN SCHEDULE—Table on a placing drawing giving the mark number and size for the column, number of pieces and size of vertical
bars, ties or spirals and any bar mark numbers required.
COLUMN TIES—Reinforcing bars bent into square, rectangular, U-shaped, circular or other shapes for the purpose of holding column vertical
bars in place.
COMPRESSION BARS—Reinforcing bars used to resis compression forces.
COMPRESSIVE STRENGTH-Maximum sress a material is capable of resising under axial compression loading.
CONCRETE BLOCK BAR SUPPORTS—Precas concrete blocks, with or without tie wires, used to support reinforcing bars above the ground
or to space bars of vertical forms and above horizontal forms. Also known as “dobies.”
CONCRETE COVER—The disance from the face of the concrete to the reinforcing seel, also referred to as “Fireproofng,” “Clearance,” or
“Concrete Protection.”
CONSTRUCTION JOINT—Separation between two placements of concrete; a means for keying two sections together.
CONTACT SPLICE—A means of splicing reinforcing bars by lap splicing in direct contact. See LAP SPLICE.
CONTINUOUS BEAM—A beam which extends over three or more supports (including end supports).
CONTINUOUS HIGH CHAIRS—Bar supports consising of a continuous longitudinal upper member with evenly spaced legs used to support
reinforcing bars near the top of slabs. See SUPPORT BARS and INDIVIDUAL HIGH CHAIRS.
CONTINUOUSLY REINFORCED CONCRETE PAVEMENT— A pavement without transverse contraction or expansion joints and with
sufcient reinforcement to keep transverse cracks tightly closed.
CONTRACT DOCUMENTS—Documents covering the required Work and including the Project Drawings and Project Specifcations.
CONTRACTION JOINT—Saw-cut, formed, or grooved joint to allow for shrinkage in a concrete slab.
CONTRACTOR—The person, frm, or corporation with whom the Owner enters into an agreement for consruction of the Work.
COUPLER—Threaded device for joining reinforcing bars for the purpose of providing transfer of either axial compression or axial tension or
both from one bar to the other.
COUPLING SLEEVE—Non-threaded device ftting over the ends of two reinforcing bars for the eventual purpose of providing transfer of either
axial compression or axial tension or both from one bar to the other.
CRIBBING (Also known as DUNNAGE)—Wooden blocks or boards used in a horizontal or vertical position to separate bundles of reinforcing
bars.
CRSI—Concrete Reinforcing Steel Insitute.
CULVERT—Any sructure, not classifed as a bridge, which provides a waterway or other opening under a road or highway.
CURTAIN—A single layer of vertical and horizontal reinforcing bars in a wall. If a wall has a layer of reinforcement at each face, it would be
called a “double curtain” wall.
CUT-OFF SAW—A powered saw used to cut reinforcing bars at the job-site.
D
DEFORMED BAR—A reinforcing bar manufactured with deformations (protrusions) to provide a locking anchorage with the surrounding
concrete.
DESIGN DRAWINGS—See STRUCTURAL DRAWINGS.
DESIGNING—Preparation of sructural drawings to show general arrangement of the sructure, size and reinforcement of members, and other
information for consruction and for the preparation of placing drawings.
DETAILERS—Draftsmen who prepare reinforcing bar placing drawings.
DOLLY—Small, heavy, wheeled platform used for moving heavy objects. Colloquially, any wheeled cart or carrier.
DOBIES—See CONCRETE BLOCK BAR SUPPORTS.
DOG-LEG—See OFFSET BEND.
DOWEL—A bar connecting two separately cas sections of concrete. A bar extending from one concrete section into another is said to be
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CRSI: Reinforced Concrete Terminology
doweled into the adjoining section. Examples: column dowels into a column or horizontal wall bars doweled into an adjacent wall section.
DOWEL SLEEVE—Cap of light metal or cardboard on one end of a dowel bar to allow free movement of an expansion joint.
DOWEL TEMPLATE—Frame which outlines the dimensions for setting dowel bars into footings for columns and walls.
DRAFTSMAN—One who prepares drawings. See DETAILERS.
DRILLED PIER-A drilled shaft usually extending through water or soft soil to solid earth or rock. Sometimes called a “caisson”.
DROP PANEL—The sructural portion of a fat slab which is thickened (by “dropping” the form) throughout an area surrounding a column,
column capital or bracket.
E
END-BEARING SLEEVE—Device ftting over the abutting ends of two reinforcing bars for the purpose of ensuring transfer of only axial
compression from one bar to the other.
ENDO—The dimension from the end of a reinforcing bar to a point of reference along its longitudinal axis; i.e., any bar is positioned in the
forms transversely by “cover” or “spacing” and longitudinally by “cover” or “endo.”
ENGINEER—A licensed professional or sructural engineer, responsible for the design of reinforced concrete, sructural seel, and other
materials which make up the complete sructure.
ENGINEERING DRAWINGS—See STRUCTURAL DRAWINGS.
EPOXY COATING—An organic, non-metallic coating applied to reinforcing seel by electrosatic spray to prevent corrosion.
EXPANSION JOINT—A separation between two sections of concrete which is provided to allow for free movement due to temperature
changes. The sections are usually divided by a srip of metal or bituminous material and are sometimes tied together with dowels, using
sleeves or coatings at one end.
F
FABRICATED HIGH CHAIR-See STANDEE.
FABRICATION—Actual work on the reinforcing bars such as cutting, bending, bundling, and tagging.
FABRICATOR—A company that is capable of preparing placing drawings, bar liss, and soring, shearing, bending, bundling, tagging, and
delivering reinforcing bars.
FAR FACE (OF A WALL)—Face farthes from the viewer, which may be the outside or inside face, depending on whether one is inside looking
out or outside looking in.
FILLET—Beveled inside corner usually at 45° to avoid a sharp 90° change in direction at the intersection of two reinforced concrete members.
Also refers to a triangular-shaped weld.
FIREPROOFING—See CONCRETE COVER. Also refers to encasement of reinforcing seel for fre protection.
FLAT PLATE SLAB—A fat slab without drop panels or column capitals.
FLAT SLAB—A concrete slab reinforced in two or more directions, with drop panels and with or without column capitals.
FOOTINGS—That part of the foundation of a sructure which ress on earth.
FORMS—A temporary sructures or molds, usually made of wood, fberglass, metal or plasic, for the support of concrete while it is setting and
gaining sufcient srength to be self-supporting.
FOUNDATION—Subsructure through which the loads are carried to the earth or rock.
G
GALVANIZE—To dip seel into molten zinc, which is termed “hot-dip galvanizing”; or to electroplate with zinc.
GENERAL CONTRACTOR—An individual or company that bids and executes the contract for actual consruction, coordinates and supervises
the work of the Subcontractors and is responsible for the completion of the Work in accordance with the project drawings and project
specifcations.
GIN POLES—Single vertical guyed pole for supporting lifting tackle.
GIRDER—Principal beam supporting other beams.
GRADE BEAM—A low foundation wall or a beam usually at ground level, which provides support for the walls of a sructure.
GRADE MARKS—Markings rolled onto the surface of reinforcing bar to identify the grade of seel.
GRADE OF REINFORCING BARS—The means by which an Engineer specifes the srength properties of the reinforcing bar required in each
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part of a sructure.
GRILLAGE BARS-Reinforcement placed around pos-tensioning anchors. Also known as “back-up bars”.
GROOVE WELD—Arc weld used to join two reinforcing bars, or a reinforcing bar to a seel plate or an angle to make a lap splice.
GROUT—A concrete which contains no coarse aggregate.
H
HAIRPIN BARS—Bars, usually small sizes, bent to a hair pin shape and used for such purposes as short hooked spacer bars in columns and
walls, and for special dowels.
HAUNCH—Portion of a beam that increases in depth towards the support.
HEADER—A short reinforced beam, jois or slab edge generally used at foor openings to support other similar members terminating at the
opening.
HEAVY BENDING—Reinforcing bar sizes #4 through #18 [#13 through #57], which are bent at not more than six points in one plane (unless
classifed as “Light Bending” or “Special Bending”) and single radius bending.
HICKEY—Hand tool with side opening jaw used in developing leverage for making bends on reinforcing bars at the jobsite.
HIGH CHAIR—See INDIVIDUAL HIGH CHAIRS and CONTINUOUS HIGH CHAIRS.
HOOK—A semi-circular (180°) or a 90° turn at the free end of a reinforcing bar to provide anchorage in concrete. For sirrups and column ties
only, turns of either 90° or 135° are used.
HOOK ON and/or HOOK OFF—The act of placing or removing chokers or slings on or of a bundle of reinforcing bars and connecting or
disconnecting the crane hook.
HORIZONTALS—Reinforcing bars running horizontally.
HONEYCOMB—Voids left in concrete due to loss or shortage of mortar or inadequate consolidation of the concrete.
I
INDIVIDUAL HIGH CHAIRS—Bar support used under a support bar, to provide support for top reinforcing bars in slabs, joiss or beams; also
used to support upper mats of bars in slabs without support bars.
INSERTS—Devices embedded in concrete to receive a bolt or screw to support shelf angles and machinery.
INSPECTOR—A person who examines the Work in progress at the jobsite to see that it conforms to the project drawings and project
specifcations.
INTEGRAL—Elements which act together as a unit, such as concrete joiss and top slab. Reinforced concrete members may be made integral
by bond, dowels, or being cas in one piece.
INTEGRALLY-CAST—Elements (such as reinforced concrete joiss and top slab) cas in one piece. See MONOLITHIC.
IRONWORKERS—Workers who handle and place seel and ornamental iron, including reinforcing seel and bar supports. Also, in the
Metropolitan Area of New York City, depending on local union jurisdiction, these workers are called LATHERS. Colloquial terms frequently
used include rod-setter, rodbuser; bar-setter, and bar placer.
J
JACK ROD—Plain rod, usually 7/8 or 1 inch in diameter, with square-cut or threaded ends to support sliding forms in conjunction with a jack.
In some cases, these jack rods are also used as a portion of the vertical reinforcement required.
JACK ROD SLEEVE—Piece of pipe which joins two jack rods for an end-to-end butt connection.
JOINTED REINFORCED CONCRETE PAVEMENT—A reinforced pavement with transverse joints typically spaced at 30 feet or more.
JOIST—T-shaped beam used in a parallel series in reinforced concrete jois foor consruction.
JOIST CHAIRS—Bar supports which hold and space the two reinforcing bars in the bottom of a jois.
JOIST SCHEDULE—Table on a placing drawing giving the quantity and mark of the joiss, the quantity, size, length, bending details of
reinforcing bars and usually the quantity of jois chairs in each jois.
K
KEYS—Slotted joints in concrete, such as tongue and groove.
ksi—Abbreviation of kips (1,000 pounds) per square inch, used in measuring load or sress.
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L
LAP SPLICE—The overlapping of two reinforcing bars by lap splicing them side by side (in contact or non-contact); similarly the side and end
overlap of sheets or rolls of welded wire reinforcement. Also, the length of overlap of two bars. Also referred to as “lap”.
LAP-SPLICE CONNECTOR SYSTEMS—Proprietary or patented prefabricated plasic or metal boxes or srips of foam acting as keyway forms
and containing prefabricated anchorage and lap splice reinforcement. The lap splice reinforcement is feld-sraightened with a pipe and/or
hickey when the keyway form is exposed for the next pour.
LATERAL—See TRANSVERSE.
LIFT—Units of reinforcing bars tied together for shop or feld convenience. Lifts are classifed in two categories: (1) Shop lifts and (2) Field lifts.
Shop lifts are units of reinforcing bars loaded for shipment to the jobsite. Field lifts are units of reinforcing bars required for feld handling by
the Contractor. A feld lift may consis of single bundles or two or more smaller bundles tied together. A shop lift may consis of one or more
bundles, the same as feld lifts or consis of two or more feld lifts. Straight and bent bars are not combined in the same lift. Maximum weight of
a lift is dependent on regional practices and site conditions. See BUNDLE OF BARS. The term LIFT also describes the concrete placed
between two consecutive horizontal consruction joints, particularly when formwork is reused and lifted.
LIFT SLAB—Floor consruction in which slabs are cas directly on one another. Each slab is lifted into fnal position by jacks on top of the
columns. Floors are secured at each foor level by column brackets or collars.
LIGHT BENDING—All #3 [#10] bars, all sirrups and ties, and all bars #4 through #18 [#13 through #57], which are bent at more than six points
in one plane, or reinforcing bars which are bent in more than one plane (unless “Special Bending”), all one plane radius bending with more
than one radius in any bar (three maximum) or a combination of radius and other type bending in one plane (radius bending being defned as
all bends having a radius of 12 inches or more to inside of bar).
LINTEL—Beam supporting the wall above a window or door opening.
LONGITUDINAL BAR—Any reinforcing bar placed in the long direction of the member.
LOW-ALLOY STEEL REINFORCING BARS—Reinforcing bars rolled from low-alloy seel billets.
M
MARK OUT—Indicating with keel (crayon) marks on the forms, the location of each reinforcing bar; usually done by the Foreman from
information derived from the placing drawings, prior to sarting actual placing operations in an area.
MARKS—A series of letters, numbers or a combination of both used to designate (a) the parts of a sructure or (b) the identity of a bent
reinforcing bar.
MAT—A large footing or foundation slab used to support an entire sructure. The term MAT also describes a grid of reinforcing bars.
MECHANICAL SPLICE—The complete assembly of an end-bearing sleeve, a coupler, or a coupling sleeve, and possibly additional materials
or parts to accomplish the splicing of reinforcing bars.
MECHANICAL DRAWINGS—Drawings which show piping for water, sanitary, gas and drains; heating, ventilating and air conditioning ducts
and equipment, and other mechanical equipment.
MESH—See WELDED WIRE REINFORCEMENT.
METAL FORMS—Used to provide the forms for jois foor consruction. Also known as PANS.
METAL LATHER—A worker who insalls furring and metal lath, places inserts in concrete for support of ceilings; and in the Metropolitan Area
of New York City, fabricates and places bar supports and reinforcing seel, which is delivered to the jobsite in sraight lengths.
MISCELLANEOUS IRON—Steel items such as lintel angles, inserts, plates, form braces, spreaders and other sructural shapes attached to or
embedded in reinforced concrete.
MONOLITHIC—Concrete cas in one operation.
MPa—Abbreviation of the metric unit megapascals, used in measuring load or sress. Approximately 6.9 megapascals equals 1 ksi.
N
NEAR FACE (OF A WALL)—Face neares the viewer and may be inside or outside, depending on whether one is inside looking out or outside
looking in.
NON-CONTACT SPLICE—A means of splicing reinforcing bars by lap splicing not in direct contact. See LAP SPLICE.
NOMINAL DIAMETER—The diameter of a plain round bar of the same weight per linear foot as a deformed reinforcing bar.
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O
OFFSET BEND—Any bend in a reinforcing bar that displaces the center line of a section of the bar to a position parallel to the original bar, in
which the displacement is relatively small; commonly applied to column vertical bars. Also known as “dog-leg.”
ONE-WAY SLABS-A slab which presumably bends in only one direction.
OSHA—Occupational Safety & Health Adminisration.
OWNER—The corporation, association, partnership, individual, or public body or authority which the Contractor enters into agreement with and
for whom the Work is provided.
P
PAD—A footing; sometimes a block of concrete to support machinery.
PANS—Metal forms for one-way reinforced concrete joiss (one-way pans) and for two-way (wafe slab) concrete joiss (dome pans).
PARAPET—Extension of the main walls above the roof level, for architectural appearance.
PEDESTAL—Short pier used as a base for a column.
PIER—A short column used as a foundation member in consruction. Also, a large column or wall type bridge support.
PILASTER—Column partially or completely embedded in a wall, or a portion of a wall enlarged to serve as a column.
PILE—A concrete, seel, or wood member driven into the ground to support a load.
PILE CAP—A sructural member placed on the tops of piles and used to disribute loads from the sructure to the piles.
PITCH—Center-to-center spacing between turns of a spiral.
PLACING DRAWINGS—Detailed drawings which give the quantity, size, location, spacing of the reinforcing bars, and all other information
required by the Ironworker.
PLAIN CONCRETE—Structural concrete with no reinforcement or with less reinforcement than the minimum amount specifed in the ACI
Building Code.
PLAN VIEW—Top view as of any foor, roof, or foundation of a sructure.
POLE DERRICK—Small portable derrick, guyed by ropes, having a hand winch on which a cable is mounted, for raising moderately heavy
objects.
POST-TENSIONING—A method of presressing reinforced concrete when tendons are tensioned after concrete has reached a specifed
srength.
PRECAST CONCRETE—Reinforced concrete cas elsewhere than its fnal position in the sructure. Usually precas concrete consiss of
individual members such as columns, wall panels, beams or joiss erected and connected to form the sructural frame.
PRECAST PILE—A reinforced concrete pile manufactured in a casing plant or at the jobsite and driven into place by a pile hammer.
PRESTRESSED CONCRETE—Reinforced concrete in which the reinforcing seel is sretched and anchored to compress the concrete.
PROJECT DRAWINGS—The drawings which, along with the Project Specifcations, completely describe the consruction of the Work required
or referred to in the Contract Documents. Examples include Placing Drawings and Structural Drawings.
PROJECT SPECIFICATIONS—The written documents which describe the requirements for a project in accordance with the various criteria
esablished by the Owner. psi—Abbreviation of pounds per square inch used in measuring load, pressure, or sress.
PUSHER—Common expression for Ironworker Foreman.
R
RACKS—Metal or wooden supports for that portion of a reinforcing bar that extends beyond a consruction joint and is not already supported
by exising formwork or conventional tying to adjacent bars.
RADIUS BENT—Reinforcing bars bent to a radius larger than that specifed for sandard hooks; a bar curved to ft into circular walls, as the
horizontal bars in a silo.
RAFT-FOUNDATION—See MAT.
RAIL-STEEL REINFORCING BARS—Deformed reinforcing bars rolled from selected used railroad rails.
REBAR—Abbreviated term for reinforcing bar.
REED CLIPS—Light wire sections fasened to sructural seel, to hold freproofng to faces of sructural seel beam and column fanges.
REGLET—A long, narrow formed slot in concrete to receive fashing or to serve as anchorage.
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REINFORCED CONCRETE—Concrete containing reinforcing seel positioned so that the two materials act together for increased srength.
REINFORCEMENT—Steel bars or wires embedded in concrete and located in such a manner that the seel and the concrete act together in
resising loads.
RETAINING WALL—Wall reinforced to hold or retain soil, water, grain, coal, or sand.
RIGGER—Mechanic whose function is to brace, guy, and arrange for hoising materials.
RUNWAY—Decking over an area of concrete placement, usually of movable panels and supports, on which buggies of concrete travel to
points of placement.
S
SAND PLATE—A fat plate attached to the legs of a bar support for use on soil.
SCAFFOLDING—A temporary sructure for the support of deck forms, runways, or workers.
SCALE—Reduction of size to which drawings are made (as 1/8 inch = 1 foot).
SCHEDULE—Table on placing drawings (or elsewhere) to give size, shape, and arrangement of similar items. See BEAM SCHEDULE,
COLUMN SCHEDULE, JOIST SCHEDULE, and SLAB SCHEDULE.
SCREED—A template to guide fnishers in leveling of the top of fresh concrete. Screeding is the operation of rough leveling.
SCREED CHAIRS—Supports to fx the depth of slab and to hold guides for leveling of concrete.
SECTION—Cut away view through a general plan or elevation view to explain details.
SHEAR—To cut of as by two equal opposed forces. SHEARHEAD—Assembled unit in the top of the columns of fat slab or fat plate
consruction to transmit loads from slab to column.
SHEAR REINFORCEMENT—Reinforcement designed to resis shearing forces; usually; consising of sirrups bent and located as required.
SHEAR WALL—A wall designed to resis forces resulting from wind, blas or earthquake.
SHELF ANGLES—Structural angles with holes or slots in one leg for bolting to the concrete to support brick work, sone, or terra cotta.
SIMPLE BEAM—Beam supported at each end (two points) and not continuous.
SKEWED—Placed at an angle other than 90°.
SLAB—Flat section of foor or roof either on the ground or supported by beams or walls.
SLAB BOLSTER—Continuous bar support used to support bottom slab bars.
SLAB ON GROUND—A type of foundation with a concrete foor which is placed directly on the soil. The edge of the slab is usually thicker and
acts as the footing for the walls. Sometimes called a “slab on grade”.
SLAB SCHEDULE—Table on a placing drawing giving the quantity and mark of the slabs; the number of pieces, size, length and bending
details of the reinforcement in each slab.
SLEEVE—A tube which encloses a bar, dowel, or anchor rod.
SLING—Short lengths of wire, nylon, or Kevlar rope, with a spliced eye at each end or a spliced eye at one end and a hook at the other, used
to encircle a bundle of bars for hoising purposes.
SLIP FORM—Sysem of formwork for concrete which permits continuous casing. Vertical slip forms are used in buildings and tanks and
horizontal slip forms are used in paving.
SOFFIT—The bottom of a slab, beam, jois or girder.
SORTING—Opening up the bundles of reinforcing bars after unloading, so that all items are readily accessible.
SPALLING—The development of concrete spalls or fragments, usually in the shape of fakes, detached from a larger mass of concrete by a
blow, action of weather, pressure or by expansion within the larger mass.
SPAN—The horizontal disance between supports of a sructural member such as a beam, girder, slab or jois; disance between piers or
abutments of a bridge.
SPANDREL BEAMS—Perimeter or edge beams; a beam in an exterior wall.
SPECIAL BENDING—All bending to special tolerances, all radius bending in more than one plane, all multiple plane bending containing one or
more radius bends, and all bending for precas units.
SPECS—A contracted term for “project specifcations”; the directions issued by an Architect or Engineer to esablish general conditions,
sandards and detailed insructions which are used with the project drawings.
SPIRAL—A continuously coiled reinforcing bar or wire.
SPIRAL COLUMN—A column in which the vertical reinforcing bars are enclosed within a spiral. See SPIRAL.
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CRSI: Reinforced Concrete Terminology
SPIRAL SPACERS—Usually made of channels or angles, punched to form hooks, which are bent over the coiled spiral to maintain it to a
defnite pitch.
SPLICE—Connection of one reinforcing bar to another by lap splices (in contact or non-contact), mechanical splices, or welded splices; the lap
between sheets or rolls of welded wire reinforcement.
SPREADER BAR—A seel beam suspended from a crane, having two or more hooks or shackles to which slings are attached to eliminate the
possibility of bending reinforcing bars in a bundle due to handling. Sometimes called a “srong back.”
SPREAD FOOTINGS—Footings which support one or more columns or piers or a wall by bearing on earth or rock. Sometimes a simple mat
footing is called a spread footing.
STAGGERED SPLICES—Splices in reinforcing bars which are not made at the same plane.
STANDEE—A term used in some regions of the country to designate a special bar bent to a U-shape with 90° bent legs extending in opposite
directions at right angles to the U-bend. It is used as a high chair resing on a lower mat of reinforcing bars and supporting an upper mat.
Sometimes called a “fabricated high chair”.
STEM BARS—Reinforcing bars used in the wall section of a cantilever retaining wall or in the webs of a box girder. When a cantilever retaining
wall and its footing are considered as an integral unit, the wall is often referred to as the sem of the unit.
STIRRUPS—Reinforcing bars or welded wire reinforcement used in beams and girders for shear reinforcement; typically bent into a U-shape
or box-shape and placed perpendicular to the longitudinal reinforcing bars.
STORY POLE—Piece of wood or bar marked with the sory height and vertical disances for spacing horizontal reinforcing bars.
STRIPS—Bands of reinforcing bars in fat slab or fat plate consruction. The column srip is a quarter-panel wide each side of the column
centerline and runs either way of the sructure, from column to column. The middle srip is half a panel in width, flling in between column
srips, and runs parallel to the column srips to fll in the center part of a panel.
STRUCTURAL DRAWINGS—Drawings which show all framing plans, sections, details and elevations required to consruct the sructure. For
reinforced concrete sructures, they include the sizes and general arrangement of all reinforcement from which the Fabricator prepares placing
drawings.
STRUT—Short column or compression brace.
SUBCONTRACTOR—A Contractor who is under contract to the General Contractor for completion of a portion of the Work for which the
General Contractor is responsible.
SUPERINTENDENT—General Contractor’s representative at the jobsite who is responsible for continuous feld supervision, coordination, and
completion of the Work.
SUPERSTRUCTURE—Frame of the sructure, usually above grade. Portion of a bridge above piers and abutments.
SUBGRADE—The soil supporting a sructure or pavement.
SUPPORT BARS—Res on individual high chairs or bar chairs to support top reinforcing bars in slabs or joiss, respectively.
T
T-BEAM—Beam which has a T-shaped cross-section.
TEMPERATURE BARS—Reinforcing bars disributed throughout the concrete to minimize cracks due to temperature changes and concrete
shrinkage.
TEMPLATE—A rigid device to locate and hold dowels, to lay out bolt holes or inserts. See DOWEL TEMPLATE.
TENDON—A seel element such as srand, wire, bar, or rod, or a bundle of such elements, used to impart presress to a reinforced concrete
member.
TENSILE STRENGTH—Maximum sress a material is capable of resising under axial tension loading.
TIE—Reinforcing bars bent to a circular, or to a box-shape and used to hold vertical longitudinal reinforcing bars together in columns and
beams.
TIE BARS—Reinforcing bars at right angles and tied to main reinforcement to keep it in place; bars extending across a consruction joint.
TIE WIRE—Wire (generally No. 16, No. 15, or No. 14 gauge) used to secure intersections of reinforcing bars for the purpose of holding them in
place until concreting is completed.
TILT-UP—A method of concrete consruction in which the walls are cas horizontally at a location adjacent to their eventual position, and lifted
into place after removal of forms.
TOLERANCE—Allowable variation from a given dimension, quantity, or position.
TRANSVERSE—At right angles to the long direction of the member (crosswise). Also referred to as “lateral.”
TRUSS BARS—Reinforcing bars bent up to act as both top and bottom reinforcement.
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TWO-WAY FLAT SLAB—See FLAT SLAB.
U
UPTURNED BEAM—Reinforced concrete beam which extends above the slab or sructure it is supporting.
V
VERTICAL BAR—Any reinforcing bar used in an upright or vertical position.
VIBRATOR—An oscillating machine used to consolidate fresh concrete to eliminate voids or “honeycomb” before concrete hardens. See
HONEYCOMB.
VOIDED SLAB—The concept of a voided fat plate centers on removing “concrete” from the middle of the slab where it is sructurally
inefcient; reducing the dead load by as much as 35% and allowing a larger clear span with an economical slab thickness.
W
WAFFLE SLAB—A two-way reinforced concrete jois foor with ribs running in both directions. (Named after the wafe-like appearance of the
underside of the fnished foor).
WALES—Braces to two or more form panels, palings, or suds, usually horizontal. Often incorrectly called “walers.”
WALL—A vertical sructural member which encloses, divides, supports or protects a building or room.
WALL BEARING STRUCTURE—One with the slabs (i.e., the foors or roofs) supported on walls, generally of masonry, eliminating columns
and some of the beams.
WALL SPREADER—An accessory, usually fabricated from a reinforcing bar to a “Z” or “U” shape, used to separate and hold apart two faces
or curtains of reinforcement in a wall.
WEEP HOLE—Drainage opening in a wall.
WELDED SPLICES—A means of joining two reinforcing bars by electric arc welding. Bars may be lapped, butted, or joined with splice plates
or angles.
WELDED WIRE REINFORCEMENT—Wire reinforcement manufactured by means of welding the intersecting wires, used for reinforcement in
slabs, slabs on grade, and highway pavements. Also known as welded wire fabric.
WINCH—Mechanical lifting device attached to derricks on which cable is wound up by means of a crank and locked in position by a ratchet.
WING WALL—Retaining wall at end of a bridge or culvert to retain the earth.
WORK—The entire project (or separate parts) which is required to be completed under the Contract Documents. Work is the result of
performing services, furnishing labor, and supplying and incorporating materials and equipment into the consruction, all as required by the
Contract Documents.
WRAPPING—Reinforcing bars or welded wire reinforcement surrounding a sructural seel column or beam to reinforce concrete or plaser
freproofng.
Y
YIELD STRENGTH—The load limit to which reinforcing seel will sretch and return to its original length.
Z
ZINC COATING—A zinc coating applied to reinforcing seel by dipping in a molten bath of zinc to prevent corrosion. Also known as
GALVANIZING.
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CRSI: Reinforced Concrete Terminology
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Reinforced Concrete Terminology
Home > Resources > RC Terminology
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A
AASHTO—American Association of State Highway and Transportation Ofcials.
ABUTMENT—Supporting subsructure at ends of bridges.
ACI—American Concrete Insitute
ANCHORAGE—The securing of reinforcing seel in concrete either by sraight embedment, hooks, or headed bar
ANSI— American National Standards Insitute
ARC WELDING—A process by which the two pieces of seel to be joined are heated by an arc formed between an electrode and the seel. As
the electrode melts, it supplies weld material which fuses the pieces of seel together.
ARCHITECT—A person or frm who prepares the architectural drawings that determine the design and form of buildings. The Architect is
usually employed by and represents the Owner.
ARCHITECTURAL DRAWINGS—Drawings which show the general design and form of sructures by means of elevations, plans and sections;
show the various materials such as brick, concrete, glass, masonry, seel, sone and wood and their dimensions; show fxtures and fnishes for
ceilings, foor surfaces and walls.
ASTM—American Society for Tesing and Materials.
AWS—American Welding Society.
AXLE-STEEL REINFORCING BARS—Deformed reinforcing bars rolled from seel axles for railroad cars.
B
BACK UP BARS—See GRILLAGE BARS.
BAND—Group of reinforcing bars disributed in a slab or wall or footing. See STRIPS.
BANDED TENDONS—Presressing tendons which are grouped into a narrow “band” 3 to 4 feet wide over the columns. Tendons in the
perpendicular direction are spaced uniformly.
BAR—Steel bar used to reinforce concrete. See REINFORCEMENT.
BAR-END CHECK—Check of the ends of reinforcing bars to determine whether they ft the devices intended for mechanically splicing the
bars.
BAR LIST—Bill of materials, where all quantities, sizes, lengths and bending dimensions of the reinforcing bars are shown.
BAR NUMBER—A number, approximately the bar diameter in eighths of an inch [whole millimeters], used to designate the reinforcing bar size.
For example: A #5 [#16] bar is approximately 5/8 inch [16 millimeters] in diameter: a #9 [#29] bar is approximately 9/8 inches [29 millimeters]
in diameter. Bar numbers are rolled onto the bar for easy identifcation.
BAR OFF—Unloading reinforcing bars from a truck bed by levering individual bundles over the side with pinch bars.
BAR PLACER or PLACER—Worker who handles and places reinforcing seel and bar supports. See IRONWORKERS and METAL LATHER.
BAR PLACING SUBCONTRACTOR—A contractor or subcontractor who handles and places reinforcement and bar supports often colloquially
referred to as a “bar placer” or “placer.”
BAR SPACING—Disance between parallel reinforcing bars measured from center-to-center of the bars perpendicular to their longitudinal
axes.
BAR SUPPORTS—Devices of formed wire, plasic or precas concrete, to support, hold, and space reinforcing bars.
BASKET—Wire assembly to support and space dowel bars along the expansion joints in concrete pavement.
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CRSI: Reinforced Concrete Terminology
BEAM—A horizontal sructural member supporting loads from a foor or roof sysem to columns, girders or walls.
BEAM AND SLAB FLOOR CONSTRUCTION—A reinforced concrete foor sysem in which a solid slab is supported by beams or girders of
reinforced concrete.
BEAM BOLSTER—Continuous bar support used to support the reinforcing bars in the bottom of beams.
BEAM BOLSTER UPPER—Continuous bar support for the upper layer of bottom reinforcing bars in beams and top reinforcing bars in bridge
deck slabs.
BEAM SCHEDULE—Table on a placing drawing giving the quantity, size and mark number of beams; the quantity, size, length and mark
numbers of reinforcing bars and sirrups (including sirrup spacing), and, where specifed, the sirrup support bars and beam bolsers.
BELLED—Having a butt or bottom end shaped like a bell, often used on concrete piers or caissons.
BENT—A self-supporting reinforced concrete frame with one or more columns, usually at right angles to the length of the sructure it supports.
Example: The columns and cap supporting the spans of a bridge is called a bent.
BENT BAR—A reinforcing bar bent to a prescribed shape such as a truss bar, sraight bar with end hook, sirrup, or column tie.
BENT CAP—A reinforced concrete beam or block, extending across and encasing the heads of columns, comprising the top of a bent for the
bridge span above.
BILL OF LADING—A lis that gives each part or mark number, quantity, length of material, total weight, or other description of each piece of
material that is shipped to a jobsite.
BILLET—Piece of semi-fnished seel, nearly square in section, formed by hot-rolling an ingot or bloom, from which reinforcing bars are rolled.
BOLT CUTTER—A tool used to cut reinforcing bars on the job-site. Smaller (wire) mesh cutters are used to cut welded wire reinforcement or
bundle wires.
BOND—Holding or gripping force between reinforcing seel and concrete.
BOX CULVERT—A tunnel-like reinforced concrete sructure consising of single or multiple openings, usually square or rectangular in cross
section.
BOX GIRDER—A bridge having a top and bottom slab with two or more walls forming one or more rectangular bays. The wall heights may be
variable in order to provide an arched bottom slab.
BRACKET—An overhanging member projecting from a wall, column, girder, or beam to support the weight of a sructural member.
BREAK (A SPIRAL)—Opening a spiral to the round shape and forcing it toward the opposite direction that it was folded (collapsed) so that it
will remain circular for placing.
BUILDING CODE—Laws or regulations set up by building departments of cities, sates and Federal Government, for uniformity in design and
consruction practices.
BULKHEAD—Partition placed in a form to hold fresh concrete, earth, or water.
BUNDLE OF BARS—A bundle consiss of one size, length or mark (bent) of reinforcing bars tied together, with the following exceptions; (1)
very small quantities may be bundled together for convenience, and (2) groups of varying bar lengths or marks (bent) that will be placed
adjacent may be bundled together. Maximum weight of bundles is dependent on regional practices and site conditions. See LIFT.
BUNDLED BARS—A group of not more than four parallel reinforcing bars in contact with each other, usually tied together.
BURNING REINFORCEMENT—Cutting reinforcing bars with an oxy-acetylene torch.
BUTT-WELDED SPLICE—Reinforcing bar splice made by welding the butted ends.
C
CAISSONS—Piers usually extending through water or soft soil to solid earth or rock. Also cas-in-place, drilled-hole piles.
CAISSON—See DRILLED PIER.
CANTILEVER BEAM—Beam which extends beyond the supports in an overhanging position with the extended end unsupported. Similarly
such a slab is called a cantilever slab.
CARBON-STEEL REINFORCING BARS—Reinforcing bars rolled from seel billets in contras to rail or axle seel.
CAT-HEAD—A light frame and a sheave at the top of a material tower through which the lifting cable is operated.
CERTIFIED MILL TEST REPORT—A report from the producing seel mill lising the chemical analysis, physical properties, heat or lot number,
and specifcation used to manufacture the material.
CHAMFER—A beveled outside corner or edge on a beam or column, or a triangular wooden srip placed in the corner of a form to create a
beveled corner.
CHOKER—A sling hitch that is self-tightening.
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COLD JOINT—Consruction joint in concrete occurring at a place where the continuous casing has been interrupted.
COLUMN—Vertical sructural member supporting a foor beam, girder, or other member, and supporting primarily vertical loads.
COLUMN CAPITAL—Upper fared cone-shaped section (mushroom head) on circular columns; pyramid-shaped section on square columns.
COLUMN HORSE—Wood or metal supports, used in groups of two or more, to hold longitudinal reinforcing bars in a convenient position for
placing ties while prefabricating column, beam or pile cages.
COLUMN SCHEDULE—Table on a placing drawing giving the mark number and size for the column, number of pieces and size of vertical
bars, ties or spirals and any bar mark numbers required.
COLUMN TIES—Reinforcing bars bent into square, rectangular, U-shaped, circular or other shapes for the purpose of holding column vertical
bars in place.
COMPRESSION BARS—Reinforcing bars used to resis compression forces.
COMPRESSIVE STRENGTH-Maximum sress a material is capable of resising under axial compression loading.
CONCRETE BLOCK BAR SUPPORTS—Precas concrete blocks, with or without tie wires, used to support reinforcing bars above the ground
or to space bars of vertical forms and above horizontal forms. Also known as “dobies.”
CONCRETE COVER—The disance from the face of the concrete to the reinforcing seel, also referred to as “Fireproofng,” “Clearance,” or
“Concrete Protection.”
CONSTRUCTION JOINT—Separation between two placements of concrete; a means for keying two sections together.
CONTACT SPLICE—A means of splicing reinforcing bars by lap splicing in direct contact. See LAP SPLICE.
CONTINUOUS BEAM—A beam which extends over three or more supports (including end supports).
CONTINUOUS HIGH CHAIRS—Bar supports consising of a continuous longitudinal upper member with evenly spaced legs used to support
reinforcing bars near the top of slabs. See SUPPORT BARS and INDIVIDUAL HIGH CHAIRS.
CONTINUOUSLY REINFORCED CONCRETE PAVEMENT— A pavement without transverse contraction or expansion joints and with
sufcient reinforcement to keep transverse cracks tightly closed.
CONTRACT DOCUMENTS—Documents covering the required Work and including the Project Drawings and Project Specifcations.
CONTRACTION JOINT—Saw-cut, formed, or grooved joint to allow for shrinkage in a concrete slab.
CONTRACTOR—The person, frm, or corporation with whom the Owner enters into an agreement for consruction of the Work.
COUPLER—Threaded device for joining reinforcing bars for the purpose of providing transfer of either axial compression or axial tension or
both from one bar to the other.
COUPLING SLEEVE—Non-threaded device ftting over the ends of two reinforcing bars for the eventual purpose of providing transfer of either
axial compression or axial tension or both from one bar to the other.
CRIBBING (Also known as DUNNAGE)—Wooden blocks or boards used in a horizontal or vertical position to separate bundles of reinforcing
bars.
CRSI—Concrete Reinforcing Steel Insitute.
CULVERT—Any sructure, not classifed as a bridge, which provides a waterway or other opening under a road or highway.
CURTAIN—A single layer of vertical and horizontal reinforcing bars in a wall. If a wall has a layer of reinforcement at each face, it would be
called a “double curtain” wall.
CUT-OFF SAW—A powered saw used to cut reinforcing bars at the job-site.
D
DEFORMED BAR—A reinforcing bar manufactured with deformations (protrusions) to provide a locking anchorage with the surrounding
concrete.
DESIGN DRAWINGS—See STRUCTURAL DRAWINGS.
DESIGNING—Preparation of sructural drawings to show general arrangement of the sructure, size and reinforcement of members, and other
information for consruction and for the preparation of placing drawings.
DETAILERS—Draftsmen who prepare reinforcing bar placing drawings.
DOLLY—Small, heavy, wheeled platform used for moving heavy objects. Colloquially, any wheeled cart or carrier.
DOBIES—See CONCRETE BLOCK BAR SUPPORTS.
DOG-LEG—See OFFSET BEND.
DOWEL—A bar connecting two separately cas sections of concrete. A bar extending from one concrete section into another is said to be
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CRSI: Reinforced Concrete Terminology
doweled into the adjoining section. Examples: column dowels into a column or horizontal wall bars doweled into an adjacent wall section.
DOWEL SLEEVE—Cap of light metal or cardboard on one end of a dowel bar to allow free movement of an expansion joint.
DOWEL TEMPLATE—Frame which outlines the dimensions for setting dowel bars into footings for columns and walls.
DRAFTSMAN—One who prepares drawings. See DETAILERS.
DRILLED PIER-A drilled shaft usually extending through water or soft soil to solid earth or rock. Sometimes called a “caisson”.
DROP PANEL—The sructural portion of a fat slab which is thickened (by “dropping” the form) throughout an area surrounding a column,
column capital or bracket.
E
END-BEARING SLEEVE—Device ftting over the abutting ends of two reinforcing bars for the purpose of ensuring transfer of only axial
compression from one bar to the other.
ENDO—The dimension from the end of a reinforcing bar to a point of reference along its longitudinal axis; i.e., any bar is positioned in the
forms transversely by “cover” or “spacing” and longitudinally by “cover” or “endo.”
ENGINEER—A licensed professional or sructural engineer, responsible for the design of reinforced concrete, sructural seel, and other
materials which make up the complete sructure.
ENGINEERING DRAWINGS—See STRUCTURAL DRAWINGS.
EPOXY COATING—An organic, non-metallic coating applied to reinforcing seel by electrosatic spray to prevent corrosion.
EXPANSION JOINT—A separation between two sections of concrete which is provided to allow for free movement due to temperature
changes. The sections are usually divided by a srip of metal or bituminous material and are sometimes tied together with dowels, using
sleeves or coatings at one end.
F
FABRICATED HIGH CHAIR-See STANDEE.
FABRICATION—Actual work on the reinforcing bars such as cutting, bending, bundling, and tagging.
FABRICATOR—A company that is capable of preparing placing drawings, bar liss, and soring, shearing, bending, bundling, tagging, and
delivering reinforcing bars.
FAR FACE (OF A WALL)—Face farthes from the viewer, which may be the outside or inside face, depending on whether one is inside looking
out or outside looking in.
FILLET—Beveled inside corner usually at 45° to avoid a sharp 90° change in direction at the intersection of two reinforced concrete members.
Also refers to a triangular-shaped weld.
FIREPROOFING—See CONCRETE COVER. Also refers to encasement of reinforcing seel for fre protection.
FLAT PLATE SLAB—A fat slab without drop panels or column capitals.
FLAT SLAB—A concrete slab reinforced in two or more directions, with drop panels and with or without column capitals.
FOOTINGS—That part of the foundation of a sructure which ress on earth.
FORMS—A temporary sructures or molds, usually made of wood, fberglass, metal or plasic, for the support of concrete while it is setting and
gaining sufcient srength to be self-supporting.
FOUNDATION—Subsructure through which the loads are carried to the earth or rock.
G
GALVANIZE—To dip seel into molten zinc, which is termed “hot-dip galvanizing”; or to electroplate with zinc.
GENERAL CONTRACTOR—An individual or company that bids and executes the contract for actual consruction, coordinates and supervises
the work of the Subcontractors and is responsible for the completion of the Work in accordance with the project drawings and project
specifcations.
GIN POLES—Single vertical guyed pole for supporting lifting tackle.
GIRDER—Principal beam supporting other beams.
GRADE BEAM—A low foundation wall or a beam usually at ground level, which provides support for the walls of a sructure.
GRADE MARKS—Markings rolled onto the surface of reinforcing bar to identify the grade of seel.
GRADE OF REINFORCING BARS—The means by which an Engineer specifes the srength properties of the reinforcing bar required in each
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CRSI: Reinforced Concrete Terminology
part of a sructure.
GRILLAGE BARS-Reinforcement placed around pos-tensioning anchors. Also known as “back-up bars”.
GROOVE WELD—Arc weld used to join two reinforcing bars, or a reinforcing bar to a seel plate or an angle to make a lap splice.
GROUT—A concrete which contains no coarse aggregate.
H
HAIRPIN BARS—Bars, usually small sizes, bent to a hair pin shape and used for such purposes as short hooked spacer bars in columns and
walls, and for special dowels.
HAUNCH—Portion of a beam that increases in depth towards the support.
HEADER—A short reinforced beam, jois or slab edge generally used at foor openings to support other similar members terminating at the
opening.
HEAVY BENDING—Reinforcing bar sizes #4 through #18 [#13 through #57], which are bent at not more than six points in one plane (unless
classifed as “Light Bending” or “Special Bending”) and single radius bending.
HICKEY—Hand tool with side opening jaw used in developing leverage for making bends on reinforcing bars at the jobsite.
HIGH CHAIR—See INDIVIDUAL HIGH CHAIRS and CONTINUOUS HIGH CHAIRS.
HOOK—A semi-circular (180°) or a 90° turn at the free end of a reinforcing bar to provide anchorage in concrete. For sirrups and column ties
only, turns of either 90° or 135° are used.
HOOK ON and/or HOOK OFF—The act of placing or removing chokers or slings on or of a bundle of reinforcing bars and connecting or
disconnecting the crane hook.
HORIZONTALS—Reinforcing bars running horizontally.
HONEYCOMB—Voids left in concrete due to loss or shortage of mortar or inadequate consolidation of the concrete.
I
INDIVIDUAL HIGH CHAIRS—Bar support used under a support bar, to provide support for top reinforcing bars in slabs, joiss or beams; also
used to support upper mats of bars in slabs without support bars.
INSERTS—Devices embedded in concrete to receive a bolt or screw to support shelf angles and machinery.
INSPECTOR—A person who examines the Work in progress at the jobsite to see that it conforms to the project drawings and project
specifcations.
INTEGRAL—Elements which act together as a unit, such as concrete joiss and top slab. Reinforced concrete members may be made integral
by bond, dowels, or being cas in one piece.
INTEGRALLY-CAST—Elements (such as reinforced concrete joiss and top slab) cas in one piece. See MONOLITHIC.
IRONWORKERS—Workers who handle and place seel and ornamental iron, including reinforcing seel and bar supports. Also, in the
Metropolitan Area of New York City, depending on local union jurisdiction, these workers are called LATHERS. Colloquial terms frequently
used include rod-setter, rodbuser; bar-setter, and bar placer.
J
JACK ROD—Plain rod, usually 7/8 or 1 inch in diameter, with square-cut or threaded ends to support sliding forms in conjunction with a jack.
In some cases, these jack rods are also used as a portion of the vertical reinforcement required.
JACK ROD SLEEVE—Piece of pipe which joins two jack rods for an end-to-end butt connection.
JOINTED REINFORCED CONCRETE PAVEMENT—A reinforced pavement with transverse joints typically spaced at 30 feet or more.
JOIST—T-shaped beam used in a parallel series in reinforced concrete jois foor consruction.
JOIST CHAIRS—Bar supports which hold and space the two reinforcing bars in the bottom of a jois.
JOIST SCHEDULE—Table on a placing drawing giving the quantity and mark of the joiss, the quantity, size, length, bending details of
reinforcing bars and usually the quantity of jois chairs in each jois.
K
KEYS—Slotted joints in concrete, such as tongue and groove.
ksi—Abbreviation of kips (1,000 pounds) per square inch, used in measuring load or sress.
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L
LAP SPLICE—The overlapping of two reinforcing bars by lap splicing them side by side (in contact or non-contact); similarly the side and end
overlap of sheets or rolls of welded wire reinforcement. Also, the length of overlap of two bars. Also referred to as “lap”.
LAP-SPLICE CONNECTOR SYSTEMS—Proprietary or patented prefabricated plasic or metal boxes or srips of foam acting as keyway forms
and containing prefabricated anchorage and lap splice reinforcement. The lap splice reinforcement is feld-sraightened with a pipe and/or
hickey when the keyway form is exposed for the next pour.
LATERAL—See TRANSVERSE.
LIFT—Units of reinforcing bars tied together for shop or feld convenience. Lifts are classifed in two categories: (1) Shop lifts and (2) Field lifts.
Shop lifts are units of reinforcing bars loaded for shipment to the jobsite. Field lifts are units of reinforcing bars required for feld handling by
the Contractor. A feld lift may consis of single bundles or two or more smaller bundles tied together. A shop lift may consis of one or more
bundles, the same as feld lifts or consis of two or more feld lifts. Straight and bent bars are not combined in the same lift. Maximum weight of
a lift is dependent on regional practices and site conditions. See BUNDLE OF BARS. The term LIFT also describes the concrete placed
between two consecutive horizontal consruction joints, particularly when formwork is reused and lifted.
LIFT SLAB—Floor consruction in which slabs are cas directly on one another. Each slab is lifted into fnal position by jacks on top of the
columns. Floors are secured at each foor level by column brackets or collars.
LIGHT BENDING—All #3 [#10] bars, all sirrups and ties, and all bars #4 through #18 [#13 through #57], which are bent at more than six points
in one plane, or reinforcing bars which are bent in more than one plane (unless “Special Bending”), all one plane radius bending with more
than one radius in any bar (three maximum) or a combination of radius and other type bending in one plane (radius bending being defned as
all bends having a radius of 12 inches or more to inside of bar).
LINTEL—Beam supporting the wall above a window or door opening.
LONGITUDINAL BAR—Any reinforcing bar placed in the long direction of the member.
LOW-ALLOY STEEL REINFORCING BARS—Reinforcing bars rolled from low-alloy seel billets.
M
MARK OUT—Indicating with keel (crayon) marks on the forms, the location of each reinforcing bar; usually done by the Foreman from
information derived from the placing drawings, prior to sarting actual placing operations in an area.
MARKS—A series of letters, numbers or a combination of both used to designate (a) the parts of a sructure or (b) the identity of a bent
reinforcing bar.
MAT—A large footing or foundation slab used to support an entire sructure. The term MAT also describes a grid of reinforcing bars.
MECHANICAL SPLICE—The complete assembly of an end-bearing sleeve, a coupler, or a coupling sleeve, and possibly additional materials
or parts to accomplish the splicing of reinforcing bars.
MECHANICAL DRAWINGS—Drawings which show piping for water, sanitary, gas and drains; heating, ventilating and air conditioning ducts
and equipment, and other mechanical equipment.
MESH—See WELDED WIRE REINFORCEMENT.
METAL FORMS—Used to provide the forms for jois foor consruction. Also known as PANS.
METAL LATHER—A worker who insalls furring and metal lath, places inserts in concrete for support of ceilings; and in the Metropolitan Area
of New York City, fabricates and places bar supports and reinforcing seel, which is delivered to the jobsite in sraight lengths.
MISCELLANEOUS IRON—Steel items such as lintel angles, inserts, plates, form braces, spreaders and other sructural shapes attached to or
embedded in reinforced concrete.
MONOLITHIC—Concrete cas in one operation.
MPa—Abbreviation of the metric unit megapascals, used in measuring load or sress. Approximately 6.9 megapascals equals 1 ksi.
N
NEAR FACE (OF A WALL)—Face neares the viewer and may be inside or outside, depending on whether one is inside looking out or outside
looking in.
NON-CONTACT SPLICE—A means of splicing reinforcing bars by lap splicing not in direct contact. See LAP SPLICE.
NOMINAL DIAMETER—The diameter of a plain round bar of the same weight per linear foot as a deformed reinforcing bar.
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CRSI: Reinforced Concrete Terminology
O
OFFSET BEND—Any bend in a reinforcing bar that displaces the center line of a section of the bar to a position parallel to the original bar, in
which the displacement is relatively small; commonly applied to column vertical bars. Also known as “dog-leg.”
ONE-WAY SLABS-A slab which presumably bends in only one direction.
OSHA—Occupational Safety & Health Adminisration.
OWNER—The corporation, association, partnership, individual, or public body or authority which the Contractor enters into agreement with and
for whom the Work is provided.
P
PAD—A footing; sometimes a block of concrete to support machinery.
PANS—Metal forms for one-way reinforced concrete joiss (one-way pans) and for two-way (wafe slab) concrete joiss (dome pans).
PARAPET—Extension of the main walls above the roof level, for architectural appearance.
PEDESTAL—Short pier used as a base for a column.
PIER—A short column used as a foundation member in consruction. Also, a large column or wall type bridge support.
PILASTER—Column partially or completely embedded in a wall, or a portion of a wall enlarged to serve as a column.
PILE—A concrete, seel, or wood member driven into the ground to support a load.
PILE CAP—A sructural member placed on the tops of piles and used to disribute loads from the sructure to the piles.
PITCH—Center-to-center spacing between turns of a spiral.
PLACING DRAWINGS—Detailed drawings which give the quantity, size, location, spacing of the reinforcing bars, and all other information
required by the Ironworker.
PLAIN CONCRETE—Structural concrete with no reinforcement or with less reinforcement than the minimum amount specifed in the ACI
Building Code.
PLAN VIEW—Top view as of any foor, roof, or foundation of a sructure.
POLE DERRICK—Small portable derrick, guyed by ropes, having a hand winch on which a cable is mounted, for raising moderately heavy
objects.
POST-TENSIONING—A method of presressing reinforced concrete when tendons are tensioned after concrete has reached a specifed
srength.
PRECAST CONCRETE—Reinforced concrete cas elsewhere than its fnal position in the sructure. Usually precas concrete consiss of
individual members such as columns, wall panels, beams or joiss erected and connected to form the sructural frame.
PRECAST PILE—A reinforced concrete pile manufactured in a casing plant or at the jobsite and driven into place by a pile hammer.
PRESTRESSED CONCRETE—Reinforced concrete in which the reinforcing seel is sretched and anchored to compress the concrete.
PROJECT DRAWINGS—The drawings which, along with the Project Specifcations, completely describe the consruction of the Work required
or referred to in the Contract Documents. Examples include Placing Drawings and Structural Drawings.
PROJECT SPECIFICATIONS—The written documents which describe the requirements for a project in accordance with the various criteria
esablished by the Owner. psi—Abbreviation of pounds per square inch used in measuring load, pressure, or sress.
PUSHER—Common expression for Ironworker Foreman.
R
RACKS—Metal or wooden supports for that portion of a reinforcing bar that extends beyond a consruction joint and is not already supported
by exising formwork or conventional tying to adjacent bars.
RADIUS BENT—Reinforcing bars bent to a radius larger than that specifed for sandard hooks; a bar curved to ft into circular walls, as the
horizontal bars in a silo.
RAFT-FOUNDATION—See MAT.
RAIL-STEEL REINFORCING BARS—Deformed reinforcing bars rolled from selected used railroad rails.
REBAR—Abbreviated term for reinforcing bar.
REED CLIPS—Light wire sections fasened to sructural seel, to hold freproofng to faces of sructural seel beam and column fanges.
REGLET—A long, narrow formed slot in concrete to receive fashing or to serve as anchorage.
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CRSI: Reinforced Concrete Terminology
REINFORCED CONCRETE—Concrete containing reinforcing seel positioned so that the two materials act together for increased srength.
REINFORCEMENT—Steel bars or wires embedded in concrete and located in such a manner that the seel and the concrete act together in
resising loads.
RETAINING WALL—Wall reinforced to hold or retain soil, water, grain, coal, or sand.
RIGGER—Mechanic whose function is to brace, guy, and arrange for hoising materials.
RUNWAY—Decking over an area of concrete placement, usually of movable panels and supports, on which buggies of concrete travel to
points of placement.
S
SAND PLATE—A fat plate attached to the legs of a bar support for use on soil.
SCAFFOLDING—A temporary sructure for the support of deck forms, runways, or workers.
SCALE—Reduction of size to which drawings are made (as 1/8 inch = 1 foot).
SCHEDULE—Table on placing drawings (or elsewhere) to give size, shape, and arrangement of similar items. See BEAM SCHEDULE,
COLUMN SCHEDULE, JOIST SCHEDULE, and SLAB SCHEDULE.
SCREED—A template to guide fnishers in leveling of the top of fresh concrete. Screeding is the operation of rough leveling.
SCREED CHAIRS—Supports to fx the depth of slab and to hold guides for leveling of concrete.
SECTION—Cut away view through a general plan or elevation view to explain details.
SHEAR—To cut of as by two equal opposed forces. SHEARHEAD—Assembled unit in the top of the columns of fat slab or fat plate
consruction to transmit loads from slab to column.
SHEAR REINFORCEMENT—Reinforcement designed to resis shearing forces; usually; consising of sirrups bent and located as required.
SHEAR WALL—A wall designed to resis forces resulting from wind, blas or earthquake.
SHELF ANGLES—Structural angles with holes or slots in one leg for bolting to the concrete to support brick work, sone, or terra cotta.
SIMPLE BEAM—Beam supported at each end (two points) and not continuous.
SKEWED—Placed at an angle other than 90°.
SLAB—Flat section of foor or roof either on the ground or supported by beams or walls.
SLAB BOLSTER—Continuous bar support used to support bottom slab bars.
SLAB ON GROUND—A type of foundation with a concrete foor which is placed directly on the soil. The edge of the slab is usually thicker and
acts as the footing for the walls. Sometimes called a “slab on grade”.
SLAB SCHEDULE—Table on a placing drawing giving the quantity and mark of the slabs; the number of pieces, size, length and bending
details of the reinforcement in each slab.
SLEEVE—A tube which encloses a bar, dowel, or anchor rod.
SLING—Short lengths of wire, nylon, or Kevlar rope, with a spliced eye at each end or a spliced eye at one end and a hook at the other, used
to encircle a bundle of bars for hoising purposes.
SLIP FORM—Sysem of formwork for concrete which permits continuous casing. Vertical slip forms are used in buildings and tanks and
horizontal slip forms are used in paving.
SOFFIT—The bottom of a slab, beam, jois or girder.
SORTING—Opening up the bundles of reinforcing bars after unloading, so that all items are readily accessible.
SPALLING—The development of concrete spalls or fragments, usually in the shape of fakes, detached from a larger mass of concrete by a
blow, action of weather, pressure or by expansion within the larger mass.
SPAN—The horizontal disance between supports of a sructural member such as a beam, girder, slab or jois; disance between piers or
abutments of a bridge.
SPANDREL BEAMS—Perimeter or edge beams; a beam in an exterior wall.
SPECIAL BENDING—All bending to special tolerances, all radius bending in more than one plane, all multiple plane bending containing one or
more radius bends, and all bending for precas units.
SPECS—A contracted term for “project specifcations”; the directions issued by an Architect or Engineer to esablish general conditions,
sandards and detailed insructions which are used with the project drawings.
SPIRAL—A continuously coiled reinforcing bar or wire.
SPIRAL COLUMN—A column in which the vertical reinforcing bars are enclosed within a spiral. See SPIRAL.
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CRSI: Reinforced Concrete Terminology
SPIRAL SPACERS—Usually made of channels or angles, punched to form hooks, which are bent over the coiled spiral to maintain it to a
defnite pitch.
SPLICE—Connection of one reinforcing bar to another by lap splices (in contact or non-contact), mechanical splices, or welded splices; the lap
between sheets or rolls of welded wire reinforcement.
SPREADER BAR—A seel beam suspended from a crane, having two or more hooks or shackles to which slings are attached to eliminate the
possibility of bending reinforcing bars in a bundle due to handling. Sometimes called a “srong back.”
SPREAD FOOTINGS—Footings which support one or more columns or piers or a wall by bearing on earth or rock. Sometimes a simple mat
footing is called a spread footing.
STAGGERED SPLICES—Splices in reinforcing bars which are not made at the same plane.
STANDEE—A term used in some regions of the country to designate a special bar bent to a U-shape with 90° bent legs extending in opposite
directions at right angles to the U-bend. It is used as a high chair resing on a lower mat of reinforcing bars and supporting an upper mat.
Sometimes called a “fabricated high chair”.
STEM BARS—Reinforcing bars used in the wall section of a cantilever retaining wall or in the webs of a box girder. When a cantilever retaining
wall and its footing are considered as an integral unit, the wall is often referred to as the sem of the unit.
STIRRUPS—Reinforcing bars or welded wire reinforcement used in beams and girders for shear reinforcement; typically bent into a U-shape
or box-shape and placed perpendicular to the longitudinal reinforcing bars.
STORY POLE—Piece of wood or bar marked with the sory height and vertical disances for spacing horizontal reinforcing bars.
STRIPS—Bands of reinforcing bars in fat slab or fat plate consruction. The column srip is a quarter-panel wide each side of the column
centerline and runs either way of the sructure, from column to column. The middle srip is half a panel in width, flling in between column
srips, and runs parallel to the column srips to fll in the center part of a panel.
STRUCTURAL DRAWINGS—Drawings which show all framing plans, sections, details and elevations required to consruct the sructure. For
reinforced concrete sructures, they include the sizes and general arrangement of all reinforcement from which the Fabricator prepares placing
drawings.
STRUT—Short column or compression brace.
SUBCONTRACTOR—A Contractor who is under contract to the General Contractor for completion of a portion of the Work for which the
General Contractor is responsible.
SUPERINTENDENT—General Contractor’s representative at the jobsite who is responsible for continuous feld supervision, coordination, and
completion of the Work.
SUPERSTRUCTURE—Frame of the sructure, usually above grade. Portion of a bridge above piers and abutments.
SUBGRADE—The soil supporting a sructure or pavement.
SUPPORT BARS—Res on individual high chairs or bar chairs to support top reinforcing bars in slabs or joiss, respectively.
T
T-BEAM—Beam which has a T-shaped cross-section.
TEMPERATURE BARS—Reinforcing bars disributed throughout the concrete to minimize cracks due to temperature changes and concrete
shrinkage.
TEMPLATE—A rigid device to locate and hold dowels, to lay out bolt holes or inserts. See DOWEL TEMPLATE.
TENDON—A seel element such as srand, wire, bar, or rod, or a bundle of such elements, used to impart presress to a reinforced concrete
member.
TENSILE STRENGTH—Maximum sress a material is capable of resising under axial tension loading.
TIE—Reinforcing bars bent to a circular, or to a box-shape and used to hold vertical longitudinal reinforcing bars together in columns and
beams.
TIE BARS—Reinforcing bars at right angles and tied to main reinforcement to keep it in place; bars extending across a consruction joint.
TIE WIRE—Wire (generally No. 16, No. 15, or No. 14 gauge) used to secure intersections of reinforcing bars for the purpose of holding them in
place until concreting is completed.
TILT-UP—A method of concrete consruction in which the walls are cas horizontally at a location adjacent to their eventual position, and lifted
into place after removal of forms.
TOLERANCE—Allowable variation from a given dimension, quantity, or position.
TRANSVERSE—At right angles to the long direction of the member (crosswise). Also referred to as “lateral.”
TRUSS BARS—Reinforcing bars bent up to act as both top and bottom reinforcement.
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CRSI: Reinforced Concrete Terminology
TWO-WAY FLAT SLAB—See FLAT SLAB.
U
UPTURNED BEAM—Reinforced concrete beam which extends above the slab or sructure it is supporting.
V
VERTICAL BAR—Any reinforcing bar used in an upright or vertical position.
VIBRATOR—An oscillating machine used to consolidate fresh concrete to eliminate voids or “honeycomb” before concrete hardens. See
HONEYCOMB.
VOIDED SLAB—The concept of a voided fat plate centers on removing “concrete” from the middle of the slab where it is sructurally
inefcient; reducing the dead load by as much as 35% and allowing a larger clear span with an economical slab thickness.
W
WAFFLE SLAB—A two-way reinforced concrete jois foor with ribs running in both directions. (Named after the wafe-like appearance of the
underside of the fnished foor).
WALES—Braces to two or more form panels, palings, or suds, usually horizontal. Often incorrectly called “walers.”
WALL—A vertical sructural member which encloses, divides, supports or protects a building or room.
WALL BEARING STRUCTURE—One with the slabs (i.e., the foors or roofs) supported on walls, generally of masonry, eliminating columns
and some of the beams.
WALL SPREADER—An accessory, usually fabricated from a reinforcing bar to a “Z” or “U” shape, used to separate and hold apart two faces
or curtains of reinforcement in a wall.
WEEP HOLE—Drainage opening in a wall.
WELDED SPLICES—A means of joining two reinforcing bars by electric arc welding. Bars may be lapped, butted, or joined with splice plates
or angles.
WELDED WIRE REINFORCEMENT—Wire reinforcement manufactured by means of welding the intersecting wires, used for reinforcement in
slabs, slabs on grade, and highway pavements. Also known as welded wire fabric.
WINCH—Mechanical lifting device attached to derricks on which cable is wound up by means of a crank and locked in position by a ratchet.
WING WALL—Retaining wall at end of a bridge or culvert to retain the earth.
WORK—The entire project (or separate parts) which is required to be completed under the Contract Documents. Work is the result of
performing services, furnishing labor, and supplying and incorporating materials and equipment into the consruction, all as required by the
Contract Documents.
WRAPPING—Reinforcing bars or welded wire reinforcement surrounding a sructural seel column or beam to reinforce concrete or plaser
freproofng.
Y
YIELD STRENGTH—The load limit to which reinforcing seel will sretch and return to its original length.
Z
ZINC COATING—A zinc coating applied to reinforcing seel by dipping in a molten bath of zinc to prevent corrosion. Also known as
GALVANIZING.
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