7-108 SECTIO N 730 – PILING 730.0 1 STEEL PILING . Steel piling shall be rolled steel sections of the weight and shape shown on the Plans. Piles, splice plates, and point reinforcement shall be new material conforming to the requirements of ASTM A572, Grade 345 (Grade 50). When cast steel shoes are used, they shall conform to the requirements of AASHTO M 103, Grade 485 -275 (Grade 70 -40) or ASTM A148, Grade 550 -275 (Grade 80-40). 730.0 2 STEEL SHEE T PILING . Steel sheet piling shall be rolled steel sections of the type, shape, and weight shown on the Plans and shall be capable of being interlocked so that a continuous wall is formed when individual pieces are driven side by side. Permanent steel sheet piling shall be new material conforming to the requirements of AASHTO M 202 . 730.0 3 STEEL CASIN G FOR DRILLE D SHAFTS . Permanent steel casing for drilled shafts shall conform to the requirements of ASTM A36 or ASTM A252 , Grade 2. 7-109 SECTION 731 – BEARING PADS FOR STRUCTURES
731.01 BEARING PADS . Bearing pads shall be manufactured from all -new materials comprised of high -
quality elastomer with a random distribution of synthetic fibers in proper proportion to maintain strength and stability. The finished product shall withstand a compressive load perpendicular to the plane of laminations of 7,000 psi. The surface shall have a hardness of 80 (± 10) using a Shore A durometer, in accordance with the requirements of ASTM D2240 .
731.02 ELASTOMERIC MATERIAL . Elastomeric material shall conform to the AASHTO LRFD Bridge
Construction Specifications, Section 1 8 and AASHTO M 251 , Durometer Grade 50, Low Temperature Brittleness Grade 4, unless otherwise specified . Elastomeric material shall have a shear modulus of 110 psi, unless otherwise specified. The resul ting product shall be free of porous areas, weak sections, bubbles, foreign matter, or other defects affecting serviceability. Testing of elastomeric material will be waived for bearings that will be encased in concrete in the final work.
731.03 STAINLESS STEEL . Stainless steel shall conform to the requirements of the AASHTO LRFD Bridge
Design Specifications, Section 14 and the AASHTO LRFD Bridge Construction Specifications, Section 18 . Stainless steel used as a mating surface with polytet rafluoroethylene (PTFE) material and incorporated in bearing devices shall conform to the requirements of ASTM A240, Type 304.
731.04 PTFE MATERIAL . Polytetrafluoroethylene (PTFE) material incorporated in bearing devices shal l
be all -new material with a minimum thickness of 1/8 inch and conforming to the requirements of the AASHTO LRFD Bridge Design Specifications, Section 14.7.2 and the AASHTO LRFD Bridge Construction Specifications , Section 18 .