Development of an Objective Field Test to Determine Tack Coat Adequacy

Details

• Creators:
  Tandon, Vivek ; Deysarkar, lndranil
• Corporate Creators:
  University of Texas at El Paso. Center for Transportation Infrastructure Systems
• Corporate Contributors:
  Texas. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Coatings Development Field Tests Protective Coating Tack Tack Coats Testing Tests
• Publication/ Report Number:
  TX-0-4129-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• Edition:
  Technical Report
• Corporate Publisher:
  University of Texas at El Paso. Center for Transportation Infrastructure Systems
• Abstract:
  TexDOT has recently experienced a number of pavement failures due to poor quality of tack coat. Currently, there are no field test systems to determine the quality of the tack coat. Hence, a field test set-up is needed to determine the quality of the tack coat before paving operations and was the objective of this study. Several currently available test equipment that had potential for field application were evaluated in the parking lot as well as in the laboratory. The test results indicated that none of the equipment has potential to consistently identify quality of the tack coat. The main reason for failure was the mode of testing. The test setups mainly focused on the shear strength measurement; however, the shear strength measurements also included frictional resistance offered by the tested surface. the lessons learned, a device that measures only the quality of tack and is independent of the surface tested was developed. The developed device "UTEP Pull-off Device" measures quality of tack coat in tension (pull-off) mode rather than shear mode; therefore, is independent of tested surface. The evaluation of the device in the parking lot as well as in the laboratory identified that the device can consistently identify the quality of tested tack coat. Since the strength of the tack coat is dependent on the set time and test temperature, a test system is proposed that can be used to develop relationship in the laboratory. The developed relationship can then be used in the field to identify adequacy of the tack coat. Preliminary field evaluations indicated that the device has the capability of identifying the quality of the tack coat. The developed device is simple, reliable, economical, and could determine the quality of the tack coat in less than 45 minutes.
• Format:
  PDF
• Funding:
  Study No. 0-4129
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:6da3a275e22f5cf598121c0fbde05b3e243c868f975535f08978acc12d8e52fb
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/39295/dot_39295_DS1.pdf
• File Type:
  [PDF - 32.55 MB ]