811Reinforcing Steel, Wire Rope, and Wire Enclosures

Reinforcing Steel, Wire Rope, and Wire Enclosures

811.1Reinforcing Steel

811.1.1 General

1 Bundle and tag reinforcing steel with weather-resistant tags.

811.1.2 Reinforcing Steel Bars

1 Provide and use reinforcing steel bars in accordance with ASTM A 615 [ASTM A 615M]. Provide grade 60 [grade 420] bars.

2 For epoxy-coated reinforcing steel bars, ensure coating in accordance with ASTM A 775 [ASTM A 775M], including the certification requirements in section 14.1. From the epoxy coating manufacturer, obtain patching or repair material that is compatible with the coating, inert in concrete, and suitable for field use.

3 Provide and use galvanized reinforcing steel bars, tie wires, and bar supports in accordance with ASTM A 767 [ASTM A 767M], class 1 coating.

4 Use spiral reinforcement in accordance with ASTM A 82 [ASTM A 82M].

811.1.3 Steel Bar Mats

1 Use fabricated steel bar mats for concrete reinforcement in accordance with AASHTO M 54 [AASHTO M 54M] for deformed, intermediate grade, new billet steel for either clipped or welded mats.

811.1.4 Welded-Wire Fabric

1 Provide and use welded-wire fabric in accordance with ASTM A 1064 [ASTM A 82M].

811.2Dowel Bars and Tie Bars for Concrete Pavement

811.2.1 General

1 Provide and use saw-cut, epoxy-coated smooth dowel bars in accordance with AASHTO M 254, type B, free of burrs or projections restricting movement.

2 Provide dowels of at least grade 40 steel in accordance with AASHTO M 31 [grade 300 in AASHTO M 31M]; dowels may be cut from longer coated bars. The department does not require epoxy coating of cut dowel bar ends.

Reinforcing Steel, Wire Rope, and Wire Enclosures SECTION 811

3 Provide epoxy-coated tie bars in accordance with Subsection 811.1.2, Reinforcing Steel Bars. Tie bars may be cut from longer bars.

4 For existing pavement thicker than 8 in [200 mm], provide and use 1½- inch [38 mm] diameter bars 18 in [450 mm] long. For existing pavement equal to or less than 8 in [200 mm] thick, provide and use 1¼-inch [32 mm] diameter bars 18 in [450 mm] long.

811.2.2 Dowel Bar End Caps

1 Provide and use nonmetallic dowel bar end caps with inside protrusions that allow for ¼ in [6 mm] movement of the bar at each end and prevent compression of the cap against the end of the bar during installation.

811.2.3 Dowel Bar Sleeves

1 Provide and use metal sleeves for dowel bars of an approved design to cover from 1 ¾ in to 2¼ in [45 mm to 55 mm] of the dowel, with a closed end and suitable stop to hold the end of the sleeve at least 1 in [25 mm] from the end of the dowel bar.

811.2.4 Dowel Bar Release Agent

1 Use a dowel bar release agent pre-approved by the Materials Program.

811.2.5 Chairs

1 For supporting and holding dowel bars in place, provide epoxy-coated or nonmetallic chair devices capable of ensuring a clearance of at least ½ in [12.5 mm] between the bottom of the bar and the surface upon which the chair is placed and designed to prevent movement of the bar during placement of the grout.

811.3Wire Rope or Wire Cable

1 Provide wire rope or cable in accordance with AASHTO M 30 or ASTM A 741 for the specified diameter and strength class.

811.4Steel Wire Strand

1 Provide steel wire strand in accordance with ASTM A 475 for the nominal diameter, grade, and coating class specified.

811.5Prestressing Steel

1 Provide and use high-tensile wire strand in accordance with ASTM A 416, grade 270 [ASTM A 416M, grade 1860].

Reinforcing Steel, Wire Rope, and Wire Enclosures SECTION 811

2 Ensure that the cross-sectional area of steel wire strand is within 0.005 in2 [3 mm2] of the nominal steel areas shown in table 1 of ASTM A 416 [ASTM A 416M].

3 Ensure that high-tensile-strength alloy bars have been thermally stress- relieved to produce a suitable, uniform metallur gical structure, and individually proof - tested during manufacturing to at least 90 percent of the manufacturer’s minimum guaranteed ultimate strength. Provide bars in accordance with Table 811.5-1, Prestressing Steel Mechanical Properties.

Table 811.5-1 Prestressing Steel Mechanical Properties Mechanical Properties Regular Grade Special Grade Ultimate tensile strength, min., psi [MPa] 145,000 [1000] 160,000 [1100] Yield strength (measured by the 0.7% extension-under-load method), min., psi [MPa] 130,000 [900] 140,000 [965] Elongation, % min. (in 20 bar diameters after rupture) 4.0 4.0 Reduction of area, %, min. 25 20 Modulus of elasticity (at 70% of manufacturer’s min. guaranteed ultimate strength), min., psi [MPa] 25 × 106 [1.72 × 105] 25 × 106 [1.72 × 105]

4 Ensure that diameter tolerances are in accordance with ASTM A 29 [ASTM A 29M]. Use only one grade of bars for any individual member.

811.6Gabions and Revet Mattresses

1 For gabions and revet mattresses, provide and use a woven wire fabric in accordance with ASTM A 975, style 1.

2 Provide as specified in the contract, galvanized, smooth steel lacing and tie wire; galvanized hog rings may be used to fasten ends, sides and top panels.

3 For steel stakes, provide 5-foot [1.5 m] crane rails, nominal 3-inch [75 mm] standard pipe, or angles 4 in × 4 in × ⅜ in [100 mm × 100 mm × 10 mm]. Rail, pipe, or angles free from rust or damage that could affect the stake’s strength may be reused.