03200 Reinforcement.doc

Base Pavements IDIQ

JCGU 09-1700

DIVISION 03 - CONCRETE

SECTION 03200 - CONCRETE REINFORCEMENT

PART 1 – GENERAL:

1.1 REFERENCES: The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only. All publications shall be the latest version/edition/revision of the documents listed below, in effect on the date of this solicitation, except where a date is given.

AMERICAN CONCRETE INSTITUTE (ACI)

ACI 318/318R

Building Code Requirements for Structural Concrete and Commentary

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

A 615

Deformed and Plain Billet-Steel Bars for Concrete Reinforcement

A184/A 184M

Fabricated Deformed Steel Bar Mats for Concrete

Reinforcement

CONCRETE REINFORCING STEEL INSTITUTE (CRSI)

CRSI MSP-1

Manual of Standard Practice

Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges, Texas Department of Transportation, June 2004.

1.2 SUBMITTALS:

The following shall be submitted in accordance with Specification SECTION 01010:

1.2.1 Detail Drawings: Detail drawings shall be submitted and shall show reinforcing steel schedules, sizes, grades, and splicing and bending details. Drawings shall show support details including types, sizes and spacing.

1.3 DELIVERY AND STORAGE:

Reinforcement and accessories shall be stored off the ground on platforms, skids, or other supports.

PART 2 – PRODUCTS:

2.1 DOWELS:

Dowels shall be deformed bars conforming to ASTM A615, Grade 60.

2.2 REINFORCING STEEL:

Reinforcing steel shall be deformed bars conforming to ASTM A 615 Grade 60 and TXDOT, Item 440, “Reinforcing Steel”, as shown on the plans.

2.3 WIRE TIES:

Wire ties shall be 16-gauge or heavier black annealed steel wire.

2.4 SUPPORTS:

Bar supports for formed surfaces shall be designed and fabricated in accordance with CRSI and shall be steel. For slabs, supports shall be plastic coated steel fabricated with bearing plates, or specifically designed wire-fabric supports fabricated of plastic. No concrete blocks shall be used in slabs for support.

2.5 FABRICATED BAR MATS:

Fabricated bar mats shall conform to ASTM A 184/A 184M.

PART 3 – EXECUTION:

3.1 REINFORCEMENT:

Reinforcement shall be fabricated to shapes and dimensions shown and shall conform to the requirements of ACI 318/318R. Reinforcement shall be cold bent unless otherwise authorized. Bending may be accomplished in the field or at the mill. Bars shall not be bent after embedment in concrete. Safety caps shall be placed on all exposed ends of vertical concrete reinforcement bars that pose a danger to life safety. Wire tie ends shall face away from the forms.

3.1.1 Placement: Reinforcement shall be free from loose rust and scale, dirt, oil, or other deleterious coating that could reduce bond with the concrete. Reinforcement shall be placed in accordance with ACI 318/318R and TXDOT, Item 440, “Reinforcing Steel”, at locations shown plus or minus one bar diameter. Reinforcement shall not be continuous through expansion joints and shall be as indicated through construction or contraction joints. Concrete coverage shall be as indicated on the drawings and required by ACI 318/318R. If bars are moved more than one bar diameter to avoid interference with other reinforcement, conduits or embedded items, the resulting arrangement of bars, including additional bars required to meet structural requirements, shall be approved before concrete is placed.

3.1.2 Splicing: Splices of reinforcement shall conform to ACI 318/318R and shall be made only as required or indicated. Splicing shall be by lapping or by mechanical connection. Lapped bars shall be placed in contact and securely tied or spaced transversely apart to permit the embedment of the entire surface of each bar in concrete. Lapped bars shall not be spaced farther apart than one-fifth the required length of lap or 6-inches. Mechanical butt splices shall be in accordance with the recommendation of the manufacturer of the mechanical splicing device. Butt splices shall develop 125 percent of the specified minimum yield tensile strength of the spliced bars or of the smaller bar in transition splices. Bars shall be flame dried before butt splicing. Adequate jigs and clamps or other devices shall be provided to support, align, and hold the longitudinal centerline of the bars to be butt spliced in a straight line.

3.2 DOWELS:

Dowels shall be installed in slabs on grade at locations as described in the Task Order and at right angles to joint being doweled. Dowels shall be accurately aligned parallel to the finished concrete surface and rigidly supported during concrete placement. One end of dowels shall be coated with a bond breaker.

END OF SECTION

Section 03200 – Page 3 of 3