STATE OF THE PRACTICE--DESIGN AND CONSTRUCTION OF ASPHALT PAVING MATERIALS WITH CRUMB RUBBER MODIFIER. FINAL REPORT

This document is a comprehensive overview of the terminology, processes, products, and applications of crumb rubber modifier (CRM) technology. This technology includes any use of scrap tire rubber in asphalt paving materials. In general, CRM technology can be divided into two categories--the wet process and the dry process. When CRM is incorporated into an asphalt paving material, it will modify the properties of the binder (asphalt rubber) and/or act as a rubber aggregate (rubber modified hot mix asphalt). The five concepts for using CRM discussed in the report are McDonald, PlusRide, generic dry, chunk rubber asphalt concrete, and continuous blending asphalt rubber. There are two principal unresolved engineering issues related to the use of CRM in asphalt paving materials. On the national level, the ability to recycle asphalt paving mixes containing CRM has not been demonstrated. At the State and local levels, these modified asphalt mixes must be field evaluated to establish expected levels of performance. The appendices provide guidelines for material specifications, mix design, and construction specifications. An experimental work plan for monitoring performance and a stack emission testing program are also included.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 124 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00624939
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-SA-92-022
  • Files: ITRD, TRIS, ATRI, USDOT
  • Created Date: Sep 15 1993 12:00AM