Creep and Recovery

This article describes the development of a new test by the Federal Highway Administration (FHWA) that offers a faster, less expensive method for ensuring adequate elastomeric polymer content in asphalt binders. The repeated creep and recovery test (RCRT) involves applying a specific load to an asphalt binder specimen, removing the load, and then measuring the recovery response. The standard test protocol developed by the FHWA appears to produce repeatable data on percent recovery that can help pavement experts identify elastomeric polymer-modified asphalt binders and provide insight into how effectively the polymers function in the binder system. The RCRT uses equipment and procedures already familiar to the industry and can be completed in about 10 minutes, using just 1 to 2 grams of material. The American Association of State Highway and Transportation Officials and American Society for Testing and Materials have accepted the RCRT in specification format, and binder manufacturers and some state departments of transportation already are using the RCRT routinely.

Language

  • English

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Filing Info

  • Accession Number: 01047010
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Apr 25 2007 10:36PM