Assessment of asphalt interlayer designed on jointed concrete.

Details

• Creators:
  Williams, R. Christopher ; Cascione, Andrew
• Corporate Creators:
  Iowa State University. Institute for Transportation
• Corporate Contributors:
  Iowa. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Hot mix paving mixtures
  • Reflection cracking
  • Overlays (Pavements)
  • Pavement interlayers
  • Mix design
  • Field tests
  • Portland cement concrete
  • Pavement performance
  • Evaluation and assessment
• Publication/ Report Number:
  InTrans Project 13-475
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Corporate Publisher:
  Iowa State University. Institute for Transportation
• Abstract:
  Reflective cracking in hot mix asphalt (HMA) overlays has been a common cause of poor pavement performance in Iowa for ; many years. Reflective cracks commonly occur in HMA overlays when deteriorated portland cement concrete is paved over with ; HMA. This results in HMA pavement surfaces with poor ride quality and increased transportation maintenance costs. To delay ; the formation of cracks in HMA overlays, the Iowa Department of Transportation (Iowa DOT) has begun to implement a crack-relief interlayer mix design specification. The crack-relief interlayer is an asphalt-rich, highly flexible HMA that can resist ; cracking in high strain loading conditions. In this project, the field performance of an HMA overlay using a one inch interlayer ; was compared to a conventional HMA overlay without an interlayer. Both test sections were constructed on US 169 in Adel, ; Iowa as part of an Iowa DOT overlay project. The laboratory performance of the interlayer mix design was assessed for ; resistance to cracking from repeated strains by using the four-point bending beam apparatus. An HMA using a highly polymer ; modified binder was designed and shown to meet the laboratory performance test criteria. The field performance of the overlay ; with the interlayer exceeded the performance of the conventional overlay that did not have the interlayer. After one winter ; season, 29 percent less reflective cracking was measured in the pavement section with the interlayer than the pavement section ; without the interlayer. The level of cracking severity was also reduced by using the interlayer in the overlay.
  More +
• Format:
  PDF
• Funding:
  SPR RB38-013
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28696/dot_28696_DS1.pdf
• File Type:
  [PDF - 1.76 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:40c93e9bef16d07b6aaa98b379eab74a3c6e0f0f3eee0ae9ef9383233276c750