ASTM D4014-03 (R2018) PDF Download

ASTM D4014-03 (R2018) is a standard specification that covers the requirements for plain and steel-laminated elastomeric bearings used in bridges. The purpose of these bearings is to transfer loads or accommodate relative movement between the bridge superstructure and its supporting structure.

The standard defines four types of bearings: plain elastomeric bearing pad, plain elastomeric sandwich bearing, steel-laminated elastomeric bearing, and steel-laminated elastomeric bearing with an external load plate. The elastomer used in the bearings comes in two types: Type CR (chloroprene rubber) and Type NR (natural rubber). Additionally, the elastomer is available in four grades of low-temperature properties: Grade 0, Grade 2, Grade 3, and Grade 5.

The construction of the bearings involves molding individual plain bearing pads, cutting them from previously molded strips or slabs, or extruding and cutting them to length. Steel-laminated bearings or plain sandwich bearings are molded as single units under pressure and heat. The elastomer is bonded to the steel laminates and external load plates during the molding process.

To ensure compliance with the standard, various tests are performed, including bearing compression tests, evaluation of compression stiffness, visual inspection, quality control properties, shear modulus testing, ozone resistance testing, and low-temperature grade tests.