PART 1 - GENERAL
A. Provisions of Division 01 apply to this
B. Section Includes:
1. Concrete steel reinforcement as
C. Related Sections:
Section 01420: Testing and Inspection.
Section 03100: Concrete Formwork.
Section 03300: Cast-In-Place Concrete.
Section 04210: Brick Masonry.
Section 04820: Concrete Unit Masonry.
A. Regulatory Requirements: Fabrication and placement of reinforcing
shall be in accordance with requirements of CBC, Chapter 19A.
A. Comply with the following as a minimum
B. American Society for Testing and
1. ASTM A82 - Standard Specification
for Steel Wire, Plain, for Concrete Reinforcement.
2. ASTM A184 - Standard Specification
for Fabricated Deformed Steel Bar Mats for Concrete Reinforcement.
3. ASTM A185 - Standard Specification
for Steel Welded Wire Reinforcement, Plain, for Concrete.
4. ASTM A496 - Standard Specification for
Steel Wire, Deformed, for Concrete Reinforcement.
5. ASTM A497 - Standard Specification for
Steel Welded Wire Reinforcement, Deformed, for Concrete.
6. ASTM A615 - Standard Specification
for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement.
ASTM A706 - Standard Specification
for Low-Alloy Steel Deformed and Plain Bars for Concrete Reinforcement.
Institute (ACI) Publication:
1. ACI 315 – Manual of Standard Practice
for Detailing Reinforced Concrete Structures.
2. ACI 318 – Building Code Requirements
for Structural Concrete, as modified by CBC Sections 1903A and 1908A.
D. American Welding Society (AWS):
1. AWS D1.4 – Structural Welding Code –
A. Shop Drawings: Submit steel
reinforcement Shop Drawings in accordance with ACI 315. Include assembly diagrams, bending charts and
slab plans. Indicate lengths and
location of splices, size and lengths of reinforcing steel.
B. Closeout Submittals: Record exact locations of reinforcing that
vary from Shop Drawings.
A. Comply with the following as a minimum
1. Concrete Reinforcing Steel Institute
(CRSI) Manual of Standard Practice.
2. American Welding Society (AWS).
3. American Concrete Institute (ACI).
4. CBC, Chapter 19A, Concrete.
B. Source Quality Control: Refer to
Division 01 Sections for general requirements and to the following paragraphs
for specific procedures. Testing
laboratory retained by the Owner shall select test Samples of bars, ties, and
stirrups from the material at the Project Site or from the place of
distribution, with each Sample consisting of not less than two 18 inch long
pieces, and perform the following tests according to ASTM A615, or ASTM A706, as
1. Identified Bars: If Samples are
obtained from bundles as delivered from the mill, identified as to heat number,
accompanied by mill analyses and mill test reports, and properly tagged with
the identification certificate so as to be readily identified, perform one
tensile and one bend test for each 10 tons or fraction thereof of each size of
bars. Submit mill reports when Samples are selected.
2. Unidentified Bars: When positive
identification of reinforcing bars cannot be performed and when random Samples
are obtained, perform tests for each 2.5 tons or fraction thereof, one tensile
and one bend test from each size of bars.
C. Certification of Welders: Shop and
Project site welding shall be performed by welding operators certified by AWS.
STORAGE AND HANDLING
A. Avoid exposure to dirt, moisture or
conditions harmful to reinforcing.
B. Reinforcing steel bars, wire, and wire
fabric shall be stored on the Project site to permit easy access for
examination and identification of each shipment. Material of each shipment
shall be separated for size and shape.
PART 2 - PRODUCTS
A. Provide reinforcing of sizes, gages and
lengths indicated, bent to indicated shapes.
A. Steel Reinforcing Bars: ASTM A615, or
ASTM A706 deformed grade 40 billet steel unless otherwise specified or
B. Bars or Rod Mats: ASTM A184.
C. Welded Wire Fabric for
Reinforcement: ASTM A185.
D. Tie Wire: ASTM A82, fully annealed, copper-bearing
steel wire, 16 gage minimum.
E. Chairs, Spacers, Supports, and Other
Accessories: Standard manufacture conforming to ACI 315 fabricated from steel
wire of required types and sizes. For reinforcement supported from grade,
provide properly sized dense precast blocks of concrete.
OF REINFORCING BARS:
A. Comply with CRSI Manual of Standard
Practice for Reinforced Concrete Construction for fabrication of reinforcing
B. Bending and Forming: Fabricate bars of the indicated sizes and
bend and form to required shapes and lengths by methods not injurious to
materials. Do not heat reinforcement for
bending. Bend bars No. 6 size and larger in the shop
only. Bars with unscheduled kinks or
bends are not permitted. Provide only tested and permitted bar materials.
Provide only ASTM A706 steel where welding is indicated. Perform welding
by the direct electric arc process in accordance with AWS D1.4 and specified
low-hydrogen electrodes. Preheat 6
inches each side of joint. Protect
joints from drafts during the cooling process; accelerated cooling is not
permitted. Do not tack weld bars. Clean metal surfaces to be welded of loose
scale and foreign material. Clean welds each time electrode is changed and chip
burned edges before placing welds. When wire brushed, the completed welds must
exhibit uniform section, smooth welded metal, feather edges without undercuts
or overlays, freedom from porosity and clinkers, and good fusion and
penetration into the base metal. Cut out
welds or parts of welds deemed defective, using chisel, and replace with proper
welding. Prequalification of welds shall be in accordance with CBC
PART 3 - EXECUTION
A. Bars shall be bent cold. Bars partially embedded in concrete shall not
be field bent except as indicated on reviewed Shop Drawings.
B. Before installation and just prior to
placing concrete, clean reinforcing of loose scale, rust, oil, dirt and any
coating that could reduce bond.
C. Accurately position, install, and secure
reinforcing to prevent displacement during the placement of concrete.
D. Provide metal chairs to hold
reinforcement the required distance above form bottoms. In beams and slab
construction, provide chairs under top slab reinforcement as well as under
bottom reinforcement. Space chairs so that reinforcement will not be displaced
during installation. Provide metal
spacers to secure proper spacing. Stirrups shall be accurately and securely
wired to bars at both top and bottom. At
slabs, footings, and beams in contact with earth, provide concrete blocks to
support reinforcement at required distance above grade.
E. Install and secure reinforcement to
maintain required clearance between parallel bars and between bars and forms.
Lapped splices shall be installed wherever possible in a manner to provide
required clearance between sets of bars. Stagger lapped splices. Dowels and
bars extending through construction joints shall be secured in position against
displacement before concrete is installed and subsequently cleaned of concrete encrustations
while they are still soft.
F. Do not install reinforcing in supported
slabs and beams until walls and columns have been installed to underside of
slabs and beams or until construction joints have been thoroughly cleaned.
Reinforcing shall be inspected before placement of concrete and cleaned as
G. Use deformed bars unless otherwise
indicated, except for spiral reinforcement.
Remove rubbish, debris
and waste materials and legally dispose of off the Project site.
A. Protect the Work of this section until