Abstract

This specification covers bearings, which consist of all elastomer or of alternate laminates of elastomer and steel, when the function of the bearings is to transfer loads or accommodate relative movement between a bridge superstructure and its supporting structure, or both. The bearings are furnished in four types as follows: plain elastomeric bearing pad; plain elastomeric sandwich bearing; steel-laminated elastomeric bearing; and steel-laminated elastomeric bearing with external load plate. The elastomer for the manufacture of the bearing is furnished in two types: Type CR and Type NR. The elastomer for the manufacture of the bearing is furnished in four grades of low-temperature properties: Grade 0; Grade 2; Grade 3; and Grade 5. The elastomeric compound used in the construction of a bearing shall contain only either natural rubber or chloroprene rubber as the raw polymer. Internal steel laminates shall be of rolled mild steel. Plain bearing pads shall be molded individually, or cut from previously molded strips or slabs, or extruded and cut to length. A steel-laminated bearing or a plain sandwich bearing shall be molded as a single unit under pressure and heat. All bonding of elastomer to steel laminates and to external load plates shall be carried out during molding. Bearing compression tests, compression stiffness, visual inspection, quality control properties, shear modulus, ozone resistance, and low-temperature grade tests shall be performed to conform to the specified requirements.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A36/A36M Specification for Carbon Structural Steel

D395 Test Methods for Rubber Property--Compression Set

D412 Test Methods for Vulcanized Rubber and Thermoplastic Elastomers--Tension

D518 Test Method for Rubber Deterioration--Surface Cracking

D573 Test Method for Rubber--Deterioration in an Air Oven

D832 Practice for Rubber Conditioning For Low Temperature Testing

D1149 Test Methods for Rubber Deterioration--Cracking in an Ozone Controlled Environment

D1415 Test Method for Rubber Property--International Hardness

D1418 Practice for Rubber and Rubber Latices--Nomenclature

D2000 Classification System for Rubber Products in Automotive Applications

D2137 Test Methods for Rubber Property--Brittleness Point of Flexible Polymers and Coated Fabrics

D2240 Test Method for Rubber Property--Durometer Hardness

D3183 Practice for Rubber--Preparation of Pieces for Test Purposes from Products

E4 Practices for Force Verification of Testing Machines

Keywords

ICS Code

ICS Number Code 93.040 (Bridge construction)

DOI: 10.1520/D4014-03R12

ASTM International is a member of CrossRef.

ASTM D4014