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Optimization of Tack Coat for HMA Placement (2012) / Chapter Skim
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Appendix C - Standard Test Method for Assessing Tack Coat Installation Quality Using the LTCQT
Pages 90-96

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From page 90...
... C-1 A p p e n d i x C Standard Test Method for Assessing Tack Coat Installation Quality Using the LTCQT
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From page 91...
... C-2 C-2 Proposed Standard Method of Test for DETERMINING THE TACK COAT QUALITY OF ASPHALT PAVEMENT IN THE FIELD OR LABORATORY AASHTO Designation: TP XX-XX Proposed test method under review before submitting to AASHTO Subcommittee on Materials American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C.
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From page 92...
... 4.2. The test procedure involves desiccating a tacked surface using the IRH device, adjusting the temperature of the surface with the fan or heat gun to reach testing temperature, and applying a compressive load to the tacked pavement surface for a given amount of time using the LTCQT device and software.
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From page 93...
... 6.6. Temperature control devices – The mechanism of the temperature control device shall be to adjust the surface temperature to the required test temperature.
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From page 94...
... It is recommended that this shall be accomplished by placing the Infrared Reflective Heating source six inches above the tacked surface for a minim um of one hour. Note that this time may be extended for bulk application rates greater than 0.05 gal/yd².
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From page 95...
... Once the allotted time has ended, the loading plate shall automatically move away from the tacked surface at the prescribed displacement rate. The software shall by design record the normal load, vertical displacement, and time throughout the test.
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From page 96...
... K EYWORDS 13.1. Tack Coat Quality, Tensile Strength, Asphalt Overlay, Tack Coat, Slippage Failure.
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Key Terms

  • tacked surface
  • tensile strength
  • coat quality
  • compressive load
  • loading plate

  • coat material
  • test method
  • tensile load
  • ultimate tensile
  • displacement rate

  • reflective heating
  • infrared reflective
  • coat application
  • spray application
  • heating source

  • application quality
  • pavement surface
  • coat spray
  • standard test
  • louisiana tack

  • coat tensile
  • plate dimensions
  • heat blower
  • six inches
  • asphalt overlay

  • initial position
  • test apparatus
  • required compressive
  • directly contacting
  • applied using


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