All reinforcement shall be free from loose, flaky rust, loose scale, oil,
grease, mud, or other coatings that might reduce the bond with concrete.
Removal of thin powdery rust and tight rust is not required. However,
reinforcing steel which is rusted to the extent that it does not conform to
the required dimensions or mechanical properties shall not be used.
2.7.1
Reinforcing Bars and Bar Mats
Reinforcing bars shall conform to [ASTM A 615/A 615M, billet-steel] [ASTM A
996/A 996M, rail and axle steel], Grade 60 [_____]. Bar mats shall conform
to ASTM A 184/A 184M. The bar members shall be [billet] [rail] [axle]
steel.
2.7.2
Deformed Welded Wire Reinforcement
Deformed Welded Wire Reinforcement shall conform to ASTM A 497/A 497M, and
shall be furnished in flat sheets.
2.8
DOWELS AND TIE BARS
**************************************************************************
NOTE: Retain paragraph on dowels. Even if not
required, design should normally allow dowels as an
option. Edit tie bars as required by design.
**************************************************************************
2.8.1
Dowels
Dowels shall be single piece bars fabricated or cut to length at the shop
or mill before delivery to the site. Dowels shall be free of loose, flaky
rust and loose scale and shall be clean and straight. Dowels may be
sheared to length provided that the deformation from true shape caused by
shearing does not exceed 1 mm 0.04 inch on the diameter of the dowel and
does not extend more than 1 mm 0.04 inch from the end of the dowel. Dowels
shall be plain (non-deformed) steel bars conforming to ASTM A 615/A 615M,
Grade 40 or 60; ASTM A 996/A 996M, Grade 50 or 60. Dowel bars shall be
epoxy coated in conformance with ASTM A 775/A 775M. Grout retention rings
shall be fully circular metal or plastic devices capable of supporting the
dowel until the epoxy hardens.
2.8.2
Dowel Bar Assemblies
Dowel bar assemblies shall consist of a framework of metal bars or wires
arranged to provide rigid support for the dowels throughout the paving
operation, with a minimum of four continuous bars or wires extending along
the joint line. The dowels shall be welded to the assembly or held firmly
by mechanical locking arrangements that will prevent them from rising,
sliding out, or becoming distorted during paving operations.
2.8.3
Tie Bars
Tie bars shall be deformed steel bars conforming to ASTM A 615/A 615M, or
ASTM A 996/A 996M, Grade 60 [_____], and of the sizes and dimensions
indicated. Deformed rail steel bars and high-strength billet or axle steel
bars, Grade 50 or higher, shall not be used for bars that are bent and
straightened during construction.
SECTION 02753
Page 45
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