item_03200_concrete_reinforcement

8/7/2019 Item_03200_Concrete_Reinforcement

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TECHNICAL SPECIFICATION

ITEM 03200

CONCRETE REINFORCEMENT

1.0 GENERAL

1.1 SCOPE

This section gives requirements for concrete reinforcement. Coordinate the requirements of thissection with all other sections of Division 3 - Concrete.

1.2 REFERENCE STANDARDS

The latest editions of reference standards listed below form a part of this specification and areapplicable to this project.

a. American Society for Testing and Materials.

ASTM A-615, "Deformed and Plain Billet-Steel Bars for Concrete Reinforcement"

ASTM A-185, "Specification for Welded Steel Wire Fabric for Concrete Reinforcement"

ASTM A-306, "Specification for Carbon Steel Bars Subject to Mechanical PropertyRequirements"

b. American Concrete Institute.

ACI 315, "Manual of Standard Practice for Detailing Reinforced Concrete Structures"

ACI 318, "Building Code Requirements for Reinforced Concrete"

c. Concrete Reinforcing Steel Institute.

CRSI 163, "Recommended Practice for Placing Reinforcing Bars"

CRSI 165, "Recommended Practice for Placing Bar Supports, Specifications andNomenclature"

1.3 SUBMITTALS

a. Certificates. Submit the manufacturer's certificates giving the properties of steel proposedfor use. List the manufacturer's test number and heat number, chemical analysis, yieldpoint, tensile strength and percent elongation. Also identify on the certificates theproposed location of the steel in the work.

b. Bill of Materials. Submit bills of materials to be reviewed with shop drawings.

c. Shop Drawings.

(1) Submit shop drawings according to Division 1, General Requirements. Showreinforcement fabrication, bar placement location, splices, spacing, and bardesignation, bar type, length, size, bending, number of bars, location of bars to



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accommodate post-tensioning tendons and other pertinent information, includingdimensions. Information must correspond directly to data listed on the bill of material.

(2) Provide sufficient detail to permit placement of reinforcement without use of designdrawings. Reproduction of design drawings for use as shop drawings will not beallowed. Begin fabrication of reinforcing steel after shop drawings have been reviewedby the Engineer.

(3) Refer to ACI reference standards for detailing, location, placing, splicing, etc. ofreinforcing steel to be shown on shop drawings.

1.4 SCHEDULING

Schedule materials for delivery to the site so that items may be installed immediately upon delivery.Plan the schedule to accommodate other work, especially post-tensioning. Place items in theproper sequence so that removal and replacement to accommodate other work is avoided.

1.5 HANDLING AND STORAGE

Store steel reinforcement above the ground on platforms, skids or other supports. Protect

reinforcing, as far as practicable, from mechanical injury, surface deterioration and rusting causedby exposure to the weather.

1.6 INSPECTION

Make storage and fabrication facilities of the supplier and fabricator available for inspection by theEngineer prior to and during fabrication.

2.0 PRODUCTS

2.1 REINFORCEMENT

a. Deformed Bars. Use deformed bars conforming to ASTM A-615, grade as specified on

drawings, for all bars except column spirals and those shown on drawings to be smoothbars. Where grade is not specified on drawings, use Grade 60.

b. Smooth Bars. Use bars conforming to ASTM A-306, Grade 70, for all smooth barsincluding column spirals.

c. Marking. Clearly mark all bars with waterproof tags showing the number of bars, size,mark, length and yield strength. Mark steel with the same designation as the member inwhich it occurs. Key marks to the concrete placement number as designated in theconcrete placement sequence shown on the drawings.

d. Welded Wire Fabric. ASTM A-185, electrically-welded wire fabric of cold-drawn wire.Provide gauge and mesh size as shown.

2.2 MECHANICAL BAR SPLICES

a. G-Loc Splices. As manufactured by Gateway Building Products, 3233 W. Grand Avenue,Chicago, Illinois, or approved equal.

b. Cadweld Splices. As manufactured by Erico Products, Inc., 2070 E. 61st Place, Cleveland,Ohio, or approved equal.

2.3 TIE WIRE



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Use 18-gage annealed steel for tie wire.

2.4 ACCESSORIES

Provide chairs, riser bars, ties and other accessories made of plastic or metal, except as otherwisespecified. Where concrete surfaces are exposed to the weather in finished work, provide plastic orplastic-coated accessories only. Use of galvanized accessories is not permitted in these locations.Use plastic accessories manufactured by W.H.C. Products, Inc., Houston, Texas or approvedequal.

3.0 EXECUTION

3.1 NOTIFICATION

Notify the Engineer at least 24-hours before concrete placement so that reinforcement may beinspected and errors corrected without delaying the work.

3.2 FABRICATION

a. Cold-Form Bent Bars. Fabricate cold-form bent bars to the shapes shown on thedrawings. Do not straighten or rebend bars without specific approval. On the job, cut barsby shearing or sawing.

b. Splices. Use a minimum number of splices. Lap splices in strict accord with ACI 318 or asshown. Where it is necessary to splice reinforcement other than as shown, the Engineerwill determine the character of the splice. Do not make splices at points of maximumstress. Stagger splices in adjacent bars.

c. Fabrication Tolerances. Bars used for concrete reinforcement must conform to thefollowing fabrication tolerances.

Measurement Tolerance in Inches

Sheared length ± 1Depth of truss bars to 8-inch depth ± 0, - ¼Depth of truss bars over 8-inch depth + 0, - ½Stirrups, ties and spirals ± ¼All other bends ± 1

3.3 PLACING

a. Condition of Reinforcement. Reinforcement must be free of injurious seams, flaws, cracks,scale, loose or flaky rust or other foreign material, including oil, mud or coating that willreduce the bond to concrete.

b. Placement Tolerances. Place reinforcement within the following tolerances.

Placement Tolerance in Inches

Concrete cover to formed surfaces ± ¼Minimum spacing between bars ± ¼Top bars in slabs and beams to 8-inch depth ± ¼Top bars in slabs and beams between 8 and24-inch depth ± ½Top bars in slabs and beams more than 24 inches



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in depth ± 1Crosswise of members spaced evenly within ± 2Lengthwise of members ± 2

c. Concrete Cover. Except as otherwise shown, provide a clear cover measured fromreinforcement to the face of the concrete as listed.

Surfaces Measurement in Inches

Interior not exposed to weatherSlabs, joists, and wallsBeams, girders, and columns

¾1½

Exterior not in contact with earth or waterSlabs and walls, No. 6 and smaller barsSlabs and walls, No. 7 and larger barsBeams, girders, and columns

11½2

Exterior in contact with earth or fresh waterSlabs and walls, No. 6 and smaller barsSlabs and walls, No. 7 and larger barsBeams, girders, and columns

1½2

2½

Exposed to salt water or salt spraySlabs and wallsBeams, girders, and columns

23

FootingsTop and sidesBottom

23

Increase measurements under these conditions:Cover of top bars for slabs without wearingsurface designed to carry vehicular traffic

When using No. 14 or No. 18 bars

½

½

3.4 ASSEMBLY

a. Reinforcing Bars in Forms Use spacers, chairs, wire ties and other accessory itemsnecessary to properly assemble, space and support reinforcing. Provide accessories ofsufficient number, size and strength to adequately prevent deflection or displacement ofreinforcement due to construction loads or concrete placement. Accessoriesrecommended by CRSI will be used if not otherwise specified or shown. Accessories shallbe of a size to provide concrete cover as previously specified. Use appropriateaccessories to position and support bolts, anchors and other embedded items. Tiereinforcing bars at each intersection and to accessories. Blocking reinforcement uponconcrete or masonry is prohibited.

b. Reinforcement for Concrete on Ground. Support reinforcement on plastic chairs spacedabout three-feet (3") on center each way. Use a minimum of one (1) chair for each nine (9)square feet. Fasten chairs to the reinforcement as recommended by the manufacturer ofthe chairs.

c. Vertical Reinforcement in Columns. Offset vertical bars by at least one (1) bar diameter atsplices. Provide accurate templates for column dowels to insure proper placement.

d. Mechanical Bar Splices. Use only where indicated.



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e. Welded Wire Fabric.

(1) For welded wire fabric designated as load carrying reinforcement, make lapped splicesso that the overlap measured between the outer-most cross wires of each fabric sheetis not less than the spacing of cross wires plus two-inches (2"). Support as requiredfor reinforcing bars.

(2) For welded wire fabric not specifically designated as load carrying reinforcement, makelapped splices so that the overlap measured between the outermost cross wires ofeach fabric sheet is not less than two-inches (2"). Extend the fabric across supportingbeams and walls to within four-inches (4") of concrete edges. Also extend the fabricthrough contraction joints and construction joints, other than keyed joints in slabs onthe ground.

f. Construction Joints. Provide continuous reinforcing through joints. As a general rule,place unscheduled joints at midspan. Obtain specific approval for jointing and bar splicingthat is not indicated on the drawings. Splices shown on reviewed shop drawings areacceptable.

g. Interferences. If reinforcing interferes with the location of other reinforcing steel, conduitsor embedded items, request instructions from the Engineer. The Engineer need not benotified if bars are moved to avoid such interferences unless the bars are moved more thanone (1) bar diameter or enough to exceed specified tolerances. Do not cut reinforcementto install inserts, conduits, mechanical openings or other items without approval.

h. Field Bending. Shape reinforcing bent during construction operations to conform to thedrawings. Closely inspect the reinforcing for breaks. If reinforcing is damaged, replace,cadweld, or otherwise repair as directed. Do not bend reinforcement after it is embedded inconcrete.

i. Welding. Unless directed by the Engineer, do not weld reinforcing bars.

item_03200_concrete_reinforcement

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