CRUMB RUBBER MODIFIER (CRM) IN ASPHALT PAVEMENTS: SUMMARY OF PRACTICES IN ARIZONA, CALIFORNIA, AND FLORIDA. INTERIM REPORT

Highway agencies have been evaluating crumb rubber modifier (CRM) in hot mix asphalt (HMA) since the 1970s. Three agencies, Arizona, California, and Florida, currently use CRM in HMA at levels that would approach or exceed the mandate in Section 1038 of the Intermodal Surface Transportation Efficiency Act of 1991. This report documents the use of CRM in HMA in these three States. In particular, it addresses issues including thickness design, materials and mix design, construction procedure, including quality control, and pavement performance. The report also addresses the following questions: (1) What processes are used?, (2) Why are they used?, and (3) How are the products performing? Significant findings include the following: CRM-HMA is used primarily as a functional overlay and functional overlays are used to improve ride quality and skid resistance or pavement deterioration; the wet process is used exclusively in the three States in dense-, gap-, and/or open-graded mixes; the agencies use modified versions of the Marshall or Hveem mix design procedures; cost for CRM-HMA ranges from 15 to 70+/- percent higher than conventional HMA; and all agencies feel they are obtaining added value with CRM-HMA, but there are inadequate data to quantify the benefits.

• Corporate Authors:

  Oregon State University, Corvallis

  Transportation Research Institute
  Corvallis, OR  United States  97331

  Federal Highway Administration

  Office of Technology Applications, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Hicks, R G
  • Lundy, J R
  • Leahy, R B
  • Hanson, D
  • Epps, J
• Publication Date: 1995-9

Language

• English

Media Info

• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 152 p.

Subject/Index Terms

• TRT Terms: Construction management; Costs; Crumb rubber; Hot mix asphalt; Mix design; Overlays (Pavements); Pavement performance; Quality control; Ride quality; Skid resistance; Thickness
• Geographic Terms: Arizona; California; Florida
• Old TRIS Terms: Thickness design
• Subject Areas: Construction; Design; Finance; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00720235
• Record Type: Publication
• Report/Paper Numbers: FHWA-SA-95-056
• Contract Numbers: DTFH61-94-C-00035
• Files: TRIS, USDOT
• Created Date: Apr 19 1996 12:00AM