Neoprene Bearing Pads are molded or cut from a molded sheet of
high-grade, new neoprene synthetic rubber compounds.
As economical efficient bering plates for pre-cast, pre-stressed
concrete or steel beams in bridges and buildings. Neoprene
Pads permit a smooth and uniform transfer of load from the
beam to the substructure and allow beam rotation at the
bearing due to deflection of the beam under load. They further
allow lateral and longitudinal movement of the beam caused by
thermal forces. Neoprene Pads have no movable parts and
thermal expansion and contraction are absorbed by the pad's
ability to give and take in shear. There is no sliding motion
between pad and beam or between pad and abutment.
Compressive Stress/Strain of Steel-Reinforced Neoprene
The material specification for the elastomeric bearing shall
meet the requiremnts of the current AASHTO M 251 (Standard
specifications for laminated elastomeric bridge bearings) as
listed under subsections "Materials" and "Test".
Elastomeric bearings shall be composed of multiple laminates
of elastomeric material separated by steel reinforcing.
Bearings have steel plates as the reinforcement shall be cast
as a unit in a mold under pressure and heat and the steel
plates separating the elastomeric layers shall be completely
bonded by vulcanization to the elastomeric material on all
surfaces. An external load bearing steel plate(s) shall be
factory vulcanized to the elastomeric bearings during the
primary molding process.