Use of infrared thermography to detect thermal segregation in asphalt overlay and reflective cracking potential.

Details

• Creators:
  Elseifi, Mostafa A. ; Dhakal, Nirmal
• Corporate Creators:
  Gulf Coast Center for Evacuation and Transportation Resiliency
• Corporate Contributors:
  University Transportation Centers Program (U.S.)
• Subject/TRT Terms:
  • Thermographs
  • Infrared imagery
  • Bituminous overlays
  • Reflection cracking
  • Finite element method
  • Temperature
  • Pavement joints
  • Differential thermal analysis
• Publication/ Report Number:
  SWUTC/15/600451-00111-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Southwest Region University Transportation Center (U.S.)
• Abstract:
  The objectives of this study were to assess whether temperature differentials measured using Infrared ; Thermography (IRT) occur in an overlay built on top of discontinuities such as joints and cracks and to ; study the horizontal and vertical thermal profiles in the asphalt overlay using a validated Finite Element ; (FE) modeling approach. To achieve this objective, an infrared camera was used to monitor the ; temperature profiles in the asphalt mat in a number of field projects from the time it was placed to after ; completion of the compaction process. The temperature profiles were monitored on top and away of ; severe discontinuities and joints in the existing pavement. Results showed that thermal measurements on ; top of the joints were consistently lower than away from it, which may indicate that temperature loss may ; occur at the joints. Further, a validated FE model predicted a slightly higher rate of thermal loss at the ; bottom of the overlay above the joint than away from it due to convection losses at the joint. While this ; difference may not be large enough to be identified as thermal segregation, it can influence the bulk ; properties of the overlay at the joints and promote early cracking. Thermal differences were also observed ; in the vertical direction as lower temperatures were predicted at the top and the bottom of the overlay ; during construction due to convection losses with the ambient atmosphere and conduction between the hot ; overlay and the existing pavement.
  More +
• Format:
  PDF
• Funding:
  DTRT12-G-UTC06
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29378/dot_29378_DS1.pdf
• File Type:
  [PDF - 1.09 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:c55d594e9be3852926593e29aae904fcbde8d8b4fa037af6aafa9d1d226e3eb1