Validation of RAP and/or RAS in hydraulic cement concrete : technical report.

Details

• Creators:
  Mukhopadhyay, Anol ; Shi, Xijun
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• Subject/TRT Terms:
  • Reclaimed asphalt pavements
  • Portland cement concrete
  • Aggregate mixtures
  • Performance measurement
• Publication/ Report Number:
  0-6855-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• OCLC Number:
  990340744
• Corporate Publisher:
  Texas A&M Transportation Institute
• Abstract:
  The increasing maintenance and rehabilitation actions lead to considerable amounts of reclaimed asphalt pavement ; (RAP) left in stockpiles in the United States. The possible use of RAP in Portland cement concrete (PCC) as aggregate ; replacement not only would help dispose of excess RAP stockpiles, but also provide a reduction in virgin aggregate ; consumption in PCC, which brings significant benefits from both economic and environmental standpoints. In this ; project, the previous findings on the mechanical properties and durability of RAP-PCC reported in the literature were ; validated. The microstructures and crack propagation in the RAP-PCC system were investigated through several ; advanced techniques such as optical microscope, x-ray CT, and scanning electron microscope. Performance evaluation ; of RAP-PCC slab by using pavement performance software and the life cycle assessment models were also conducted. ; Finally, the guidelines and implementation plan were provided in order to facilitate the use of PCC containing RAP in ; the field. The major conclusions from this project are 1) The coarse RAP with suitable gradation containing sufficient ; intermediate size particles can help make dense graded concrete. The dense graded RAP-PCC showed better ; workability and mechanical properties compared to the other gap graded RAP-PCC. 2) The major weak point of the ; RAP-PCC system is the asphalt. Asphalt cohesive failure (i.e., crack easily propagate through the asphalt layer around ; the RAP particles) is the major failure mechanism. 3) Compared with the material production for plain PCC pavement, ; the production of materials for constructing RAP-PCC pavements (either full-depth or two-lift) was more economical ; and consumed less amounts of energy. It released less amounts of air pollutants, greenhouse gases, and toxic materials. ; It also led to less land use and water withdrawals and 4) The idea of using RAP-PCC as the bottom lift in a two-lift ; PCC pavement can maximize the RAP usage without compromising the pavement performance or compromise within ; the permissible limits.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32373/dot_32373_DS1.pdf
• File Type:
  [PDF - 19.64 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b3baa8e512b1ac20d3ac94d9d4be0302c0a6589c59cdc9ba195efcd681c3a622