Evaluation of crumb rubber modification of Louisiana mixtures : [research project capsule].

Details

• Creators:
  Cooper, Samuel B., III.
• Corporate Creators:
  Louisiana Transportation Research Center
• Subject/TRT Terms:
  • Crumb rubber
  • Asphalt mixtures
  • Bituminous binders
  • Superpave
  • Mix design
  • Quality assurance
  • Quality control
• Publication/ Report Number:
  15-1B
• Resource Type:
  Brief
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  The Louisiana Department of ; Transportation and Development ; (DOTD) has been allowing crumb rubber ; modifi cation (CRM) of asphalt mixtures ; since 2008. Initially, the performance ; of roadways constructed with CRM was ; adequate. The infl uence of CRM on the ; rutting characteristics of the mixture ; provided both performance and economic ; advantages to the public. Crumb rubber ; is typically used at a 10-12% modifi cation ; rate. The modifi cation reduces the ; required bituminous binder content as ; much as 0.5%. CRM stiff ens the asphalt ; binder, resulting in an increased high ; temperature performance grade. The ; reduction in bitumen content and the ; increased performance grade results ; in a mixture with improved rutting ; performance. However, the bitumen ; content reduction may have adverse ; eff ects with regard to cracking and moisture sensitivity. In recent years, the ; durability and cracking resistance of CRM mixtures have been a source of concern.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29665/dot_29665_DS1.pdf
• File Type:
  [PDF - 255.30 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b26c9e3803dc9c9428251057f92b85ca2ad4d3651616e4fb6268fea890d06dfc