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:
  Asphalt Mixtures Bituminous Binders Crumb Rubber Mix Design Quality Assurance Quality Control Superpave
• 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b26c9e3803dc9c9428251057f92b85ca2ad4d3651616e4fb6268fea890d06dfc
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29665/dot_29665_DS1.pdf
• File Type:
  [PDF - 255.30 KB ]