Quantifying Timing of Return to Traffic for Asphalt Cement Based Full Depth Reclamation Mixtures in the Laboratory

Full depth reclamation (FDR) is a pavement structure rehabilitation technique that uses inplace material to build structural capacity of a roadway. By mixing together 8-12 in. of pavement structure with a binding agent, a higher structural capacity can be achieved. However, there is often a period of time prior to the binding agent fully curing where traffic is released to the FDR before a surface course is applied. In this research, five laboratory testing devices attempted to quantify how asphalt cement based FDR builds resistance to raveling during this traffic. Four in-house designed and built testing devices were compared to the existing cold in-place recycling raveling test. Factors explored during evaluation included curing time (0-48 h), binding agent (asphalt emulsion and asphalt foam), and curing condition (ambient temperature and 40°C). In general, all five testing devices showed a decrease in potential raveling with longer curing times using an asphalt emulsion binding agent at ambient curing temperatures. Asphalt emulsion FDR showed higher resistance to raveling than asphalt foam FDR at ambient curing temperatures, but curing at 40°C did not give conclusive evidence on resistance to raveling versus ambient curing temperatures. Finally, this testing was applied in the laboratory to give a general indication of the performance of each testing device; therefore, the testing devices need to be taken into the field to verify these initial laboratory findings and to begin building correlations between the lab test results and actual raveling susceptibility in the field.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01600429
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 6 2016 11:14AM