AASHTO M 251-06 (2020) PDF Download

AASHTO M 251-06 (2020) is a standard specification that outlines the requirements for plain and laminated elastomeric bridge bearings. The purpose of this standard is to ensure that the elastomeric bearings used in bridge construction are able to accommodate various movements and forces, such as thermal expansion and contraction, rotation, camber changes, and creep and shrinkage.

The specification covers two types of elastomeric bearings: plain pads and laminated bearings. Plain pads consist solely of elastomer material, while laminated bearings have additional steel or fabric laminates. Both types of bearings are designed to provide flexibility and support to bridge structures, allowing for the necessary movement and load transfer.

The standard also addresses the performance and material requirements for elastomeric bearings. It specifies factors such as load capacity, hardness, tear and abrasion resistance, and chemical resistance. Additionally, the standard provides guidelines for testing procedures and acceptance criteria to ensure the quality and durability of the elastomeric bearings.