853.1 General Description
This section includes the requirements for reinforcement and tensioning steel, including: • Steel bars • Pretensioning steel wire strand • Post-tensioning steel wire • Post-tensioning steel bars • Plain steel bars with threaded ends • Steel wire • Steel welded wire reinforcement • Dowel bars • Dowel (tie) bars • Bar supports • Epoxy coating
853.1.01 Related References
A. Standard Specifications Section 514—Epoxy Coated Steel Reinforcement B. Referenced Documents AASHTO ASTM M 32/ M 32M M 55/ M55M M 221/ M 221M M 225/M 225M M 284/ M284M A 153/ A 153 M A 416/ A 416M A 421/ A 421M A 653/ A653M A 709/ A 709M A 722/ A 722M D 1248 QPL 12 QPL 55 QPL 61 CRSI Manual of Standard Practices
853.2 Materials
A. Requirements NOTE: Notify the Office of Materials and Research at least two weeks before blast cleaning the steel reinforcement bars and applying the epoxy coating. This time will allow the Department to schedule an inspection. B. Fabrication General Provisions 101 through 150. C. Acceptance General Provisions 101 through 150.
853.2.01 Steel Bars for Concrete Reinforcement
A. Requirements Type a. Use deformed billet steel bars from rolling mills listed on QPL 61and from fabricators listed on QPL 12 b. Use deformed billet steel bars that meet the requirements of ASTM A 615/ A 615M for bar reinforcement in concrete, unless otherwise designated. c. Use deformed billet steel for longitudinal bars in continuously reinforced concrete pavement that meet the requirements of ASTM A 615/ A 615M, Grade 60 (420). B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the material based on either QPL approval or on tests conducted by the Department. The Department will not accept bent bars that have been straightened and rebent. D. Materials Warranty General Provisions 101 through 150.
853.2.02 Pretensioning Steel Wire Strand
A. Requirements Type Use steel wire that meets all the requirements of ASTM A 416/A 416M. Use Grade 270 for prestressed concrete bridge members. a. If you plan to use strands that differ in size from those covered in ASTM A 416/A 416M submit to the Engineer complete data on the proposed strands, as stated below. Certification Submit a certification from the manufacturer that shows the results of the required tests, including stress- strain curves, and conformance to these specifications. B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the steel based on the results of tests made by the Department and the certification from the manufacturer. D. Materials Warranty General Provisions 101 through 150.
853.2.03 Post-tensioning Steel Wire
A. Requirements Type Use steel cable for post-tensioning that meets ASTM A 421/ A 421M, Type BA or WA, as specified. Certification Submit a certification from the manufacturer that shows the results of the required tests, including stress- strain curves, and conformance to these specifications. B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the steel based on the results of tests made by the Department and the certification from the manufacturer. D. Materials Warranty General Provisions 101 through 150.
853.2.04 Post-tensioning Steel Bars
A. Requirements Type Use high-strength steel bars for post-tensioning that meet the requirements of ASTM A 722/ A 722M, Type II. Drawings a. Show all appurtenances to be used with the bars on shop drawings. b. Show all dimensions and steel requirements on the drawings. c. Use the appropriate ASTM designation for the steel, if possible. Certification Submit a certification that shows the results of the required tests, including stress-strain curves, and conformance to this specification. B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the steel based on the results of the tests made by the Department and on the certification from the manufacturer. D. Materials Warranty General Provisions 101 through 150.
853.2.05 Plain Steel Bars—Threaded Ends
A. Requirements Use plain steel bars with threaded ends that meet the requirements of ASTM A 709/ A 709M, Grade 36 (250), 50(345), or 70W(485W). B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the steel based on the certification from the manufacturer. D. Materials Warranty General Provisions 101 through 150.
853.2.06 Steel Wire for Concrete Reinforcement
A. Requirements Use steel wire that meets the requirements of AASHTO M 32/ M 32M and AASHTO M 225/ M 225M and is the size shown on the plans. B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the steel based on the results of the tests made by the Department or on the certification from the manufacturer. D. Materials Warranty General Provisions 101 through 150.
853.2.07 Steel Welded Wire Fabric Reinforcement
A. Requirements Use steel welded wire reinforcement of the size and dimension shown on the plans and that meets the requirements of AASHTO M 55/ M 55M and AASHTO M 221/ M 221M. Use a vendor listed on QPL 55. B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the steel based on the results of the tests made by the Department or on a certification from the manufacturer. D. Materials Warranty General Provisions 101 through 150.
853.2.08 Dowel Bars
A. Requirements Type: Use dowel bars for concrete pavement that are plain, round steel bars that meet or exceed the tensile requirements of Table 2–Tensile Requirements for Deformed Bars, ASTM A 615/ A 615M, Grade 40 (300). B. Fabrication Coat dowel bars with either high density polyethylene or epoxy, as follows: High Density Polyethylene Use polyethylene with the following characteristics Thickness 12 to 20 mils (0.30 to 0.51 mm) Texture Smooth and dense enough to provide adequate bond- breaking characteristics Undercoating (adhesive) Modified rubber blend; 2 to 7 mils (0.05 to 0.18 mm) thick Ensure that the undercoating retains its elasticity and effectively seals small cuts or abrasions from moisture migrating under the polyethylene plastic outer coating. Epoxy Prepare the dowels for coating, select the epoxy material, apply the epoxy, and sample and test the properties of coated bars according to the requirements of Section 514. a. Apply a uniform, smooth coating to the bars that results in a film 12 mils, ± 2 mils (0.30mm, ± 0.05 mm) thick after curing. b. Do not coat the cut ends. c. Handle the coated dowels carefully to prevent damage to the coating or bar. However, bars can be welded through the epoxy to one side of the supportive basket. C. Acceptance The Department will accept the steel based on the results of the tests made by the Department or on the certification of the manufacturer. The Department will reject dowel bars with burred or deformed ends. D. Materials Warranty General Provisions 101 through 150.
853.2.09 Dowel (Tie) Bars
A. Requirements Use uncoated, plain or deformed billet-steel bars that meet the requirements of ASTM A 615/ M, Grade 40 (300)for dowel bars or tie bars in curbs, concrete medians, and other areas specified on the plans. B. Fabrication General Provisions 101 through 150. C. Acceptance The Department will accept the steel based on the results of the tests made by the Department or on the certification of the manufacturer. D. Materials Warranty General Provisions 101 through 150.
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