U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Performance Evaluation of Various HMA Rehabilitation Strategies

File Language:
English


Details

  • Creators:
  • Corporate Creators:
    Colorado State University
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    CDOT-2008-9
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Edition:
    Final Report
  • Corporate Publisher:
    Colorado Department of Transportation. Applied Research & Innovations Branch
  • Abstract:
    This study evaluates the performance of eight hot mix asphalt (HMA) rehabilitation strategies utilized by the Colorado Department of Transportation (CDOT). The rehabilitation strategies are: 2 to 4-inch overlay without pretreatment; planning and overlay; stone matrix asphalt overlay; full-depth reclamation and overlay; heater scarification and overlay; heater remix and overlay; heater repaving and overlay; and cold-in-place recycling and overlay. Performance was evaluated with respect to six independent variables: (1) Performance Grade (PG) binder temperature range, (2) traffic volume, (3) highway classification, (4) maximum aggregate size, (5) CDOT region, and (6) climate. Data analyzed in the study was obtained from the CDOT Pavement Management System Program. Results of this analysis indicate that the cold planning and overlay strategy outperforms the other rehabilitation methods with two to four-inch overlays performing second best. The heater scarification and overlay strategy performed poorest of the eight strategies. The average time required for these pavements to reach the pre-rehabilitation condition was from six to fourteen years based on a linear regression model. However, this model may overestimate rehabilitation life span since it is likely that a linear relationship is not valid for the entire rehabilitation strategy life cycle. Pavements were rehabilitated before reaching the zero service life threshold except when fatigue cracking was present. In the case of fatigue cracking, four rehabilitation strategies studied exceeded the zero service life threshold. This indicates that rehabilitation would have been warranted earlier in the life of these pavements. As a result, the expected life of the rehabilitation strategies utilized on these pavements may be shorter than could be expected had rehabilitation been done before distress reached this high level. This may explain why the heater scarification and overlay strategy performed poorer than other techniques since fatigue distress prior to rehabilitation on these projects exceeded the zero remaining service life threshold by nearly 20 percent.
  • Format:
    PDF
  • Funding:
    12.68
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:f72d006cf6f32c2b8980ff8aefd309d85ca825b90cfb2781f05d0aec0a93e69cf5e51bd50073ad0279312242deba040c75c1c96cda1927cd9e209d844fcb4247
  • Download URL:
  • File Type:
    Filetype[PDF - 5.55 MB ]
PREVIOUS
File Language:
English
ON THIS PAGE
Details
 Found an issue?
Send us an email at:
publishinghd@cdc.gov
ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP