907.01 943 SECTIO N 907 – CONCRETE REINFORCEMENT
907.01 Bar Reinforcement for Concrete Structures ................................ . 943
907.02 Dowel and Tie Bars ................................ ................................ ..... 943
907.03 Welded Wire Reinforcement ................................ ....................... 944
907.04 Prestressing Reinforcement Steel and Anchorages ...................... 944
907.01 Bar Reinforcement for Concrete Structures
Unless otherwise specified, for all steel reinforcement for con crete, provide billet steel bars conforming to the requirements of ASTM A615, Grade 60. Use standard CRSI hook details unless otherwise shown on the Plans. Provide epoxy -coated reinforcing steel that is listed on the Department’s QPL. Package, in an airt ight container, a representative 8 -ounce sample of the coating material from each batch, identify it by batch number, and furnish to the Engineer. In addition, for repair of any damage incurred during shipment or installation, the fabricator initially sha ll furnish to the Project a repair kit containing a touch -up roller and 16 ounces of touch -up coating material with each shipment of epoxy coated reinforcing steel, with additional supplies being furnished as needed. Provide metal chairs and supports coate d with plastic, epoxy, or other approved material that is chemically and electrically inert in concrete. Provide plastic -coated tie wires for use with epoxy -coated reinforcing steel. Obtain the Engineer’s approval of such tie wires before use.
907.02 Dowel and Tie Bars
Provide plain dowel bars conforming to ASTM A36 or A615. Use paint meeting the requirements of SSPC Paint Specification No. 15, Type 1 (red oxide paint) or SSPC Paint Specification No. 25. For plast ic coated dowels, meet the coating requirements of AASHTO M 254. For epoxy coated dowels, meet the coating requirements of ASTM D3963. Provide bond breakers, of the type recommended by the coating manufacturer, for all dowel bars except for Type A coated dowels conforming to AASHTO M 254. 907.03 944 Provide deformed tie bars conforming to ASTM A615.
907.03 Welded Wire Reinforcement
Provide welded wire reinforcement conforming to ASTM A1064. Refer to the Plans for gauges, spacing , and arrangement of wires and coating.
907.04 Prestressing Reinforcement Steel and Anchorages
Assign a lot number to all wire, strand, and bars, and tag them for identification purposes. Likewise, identify anchorage assemblies, and provide certification that the assemblies meet the Post -Tensioning Institute’s Acceptance Standards for Post -Tensioning Systems . Furnish a minimum of two samples from each lot or shipment received. Furnish additional samples as directed by the Engineer. The Engineer will base acceptance of the steel on the results of physical tests conducted by the Department and a manufacturer’s certification showing results of the required tests, includi ng stress-strain curves representative of the lot to be used. Provide wire that is free from injurious defects and that has a workmanlike finish with a smooth surface. The Engineer will reject material that shows injurious defects during or prior to its i nstallation in the Work. In addition to the above, the prestressing steel and anchorages for post - tensioned tendons shall comply with the following requirements:
A.Seven-Wire Strand for Prestressed Concr ete Provide strand conforming to ASTM A416 for the Grade specified. The strand manufacturer shall certify that the strand has been tested and will bond to concrete of normal strength and consistency in conformance with the prediction equations for transfe r and development lengths given in ACI/AASHTO Specifications.
B.Parallel Wire Assemblies for Post -Tensioning Provide assemblies consisting of parallel wires of the number and size shown on the Plans. Wires shall be h igh-tensile, hard -drawn, stress - relieved, and uncoated, and shall conform to ASTM A421. 907.04 945 C. Bars for Post -Tensioning Stress-relieve high tensile strength alloy bars, and then cold -stretch to a minimum of 130,000 pounds per square inch. After cold -stretching, the bars shall meet the physical properties specified in Table 907.04 -1. Table 907.04 -1: Physical Properties for Post -Tensioning Bars Property Value Minimum ultimate tensile strength 145,000 psi Minimum yield strength, measured by the 0.7% extension -under-load method 130,000 psi Minimum modulus of elasticity 25,000,000 psi Minimum elongation in 20 bar diameters after rupture 4% Diameter tolerance +0.03 inch/ -0.01 inch
D.Anchorages for Post-Tensioned Tendons
1.For Bars. Use wedge type anchorages that will develop the minimum ultimate stress specified for the nominal bar area. Wedge type anchorages shall bear against anchorage plates fabricated of hot rolled steel of type and quality approved by the Engineer.
2.For Parallel Wire Assemblies. Unless otherwise specified , use wedge type anchorage s of the sandwich plate or conical type , that can develop the ultimate strength of the total number of wires anchored. Embed conical type anchorages within the ends of the concrete members unless otherwise specified. Generally, anchorages shall bear against embedded grids of reinforcing steel approved by the Engineer.
3.Alternate Types. The Contractor may use al ternate anchorage types conforming to the general physical requirements specified above for wedge type anchorages if approved by the Engineer. Before obtaining the Engineer’s approval, demonstrate alternate type anchorages are capable of withstanding at le ast 3,000,000 cycles of twice the maximum live load stress. 908.01 946 SECTION 908 – STRUCTURAL STEEL AND APPURTENANT MATERIALS
908.01 Structural Steel ................................ ................................ ............. 946
908.02 Plate for Cold Working ................................ ................................ 946
908.03 Permanent Steel Bridge Deck Forms ................................ ........... 947
908.04 High Strength Structural Bolts ................................ ..................... 947
908.05 Cast Steel ................................ ................................ ..................... 952
908.06 Steel Forgings ................................ ................................ .............. 952
908.07 Gray Iron Castings ................................ ................................ ....... 952
908.08 Malleable Castings ................................ ................................ ....... 953
908.09 Bronze Bearing P lates, Plain ................................ ........................ 953
908.10 Bronze Bearing Plates, Self -Lubricating ................................ ...... 953
908.11 Corrosion Resistant Steel ................................ ............................. 953
908.12 Elastomeric Bearing Pads ................................ ............................ 953
908.13 Copper Sheet for Flashing ................................ ............................ 954
908.14 Pig Lead ................................ ................................ ....................... 954
908.15 Structural Steel Piles ................................ ................................ .... 954
908.16 Steel Shells ................................ ................................ ................... 954
908.17 Steel Pipes ................................ ................................ .................... 954
908.01 Structural Steel
Unless otherwise specified, provide steel plate conforming to ASTM A709, Grade 50 or 50W, and bar stock and rolled shapes conforming to ASTM A709 Grade 50S.
908.02 Plate for Cold Working
Provide plate, that is to be bent or formed cold during fabrication, that conforms to ASTM A283, Grade C.
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 952–954 of 1,072.