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Solution to Interfacial Delamination of NMDOT’s Asphalt Pavements

File Language:
English


Details

  • Creators:
  • Corporate Creators:
    University of New Mexico. School of Civil Engineering
  • Corporate Contributors:
    New Mexico. Department of Transportation. Research Bureau
  • Subject/TRT Terms:
  • Publication/ Report Number:
    456-374
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Edition:
    Final Report, 7/1/2022– 6/25/2026
  • Corporate Publisher:
    New Mexico. Department of Transportation. Research Bureau
  • Abstract:
    This study investigated interfacial delamination in NMDOT’s asphalt pavements and developed improved methods for evaluating and improving bonding between asphalt layers. Laboratory testing evaluated four tack coat types: trackless tack, SS-1H, SS-1HP, and CSS-1H. Direct shear tests were used to measure interface shear strength under different tack coat types, residual application rates, curing times, surface textures, surface aging conditions, normal stresses, loading rates, temperatures, and moisture conditions. Based on rheological properties, such as high-temperature performance grade, elastic recovery, and non-recoverable creep compliance, trackless tack showed superior performance, followed by SS-1HP, SS-1H, and CSS-1H. In direct shear testing, the highest interface shear strength for SS-1H was 252 psi at a residual application rate of 0.04 gal/yd². For SS-1HP, the highest interface shear strength was 275.29 psi at 0.06 gal/yd². For CSS-1H, the highest interface shear strength was 234 psi at 0.04 gal/yd². For trackless tack, the highest interface shear strength was 298.02 psi at 0.10 gal/yd². Overall, trackless tack produced the highest interface shear strength, followed by SS-1HP, SS-1H, and CSS-1H. The minimum curing times were about 120 minutes for SS-1H, 100 minutes for CSS-1H, 50 minutes for SS-1HP, and 25 minutes for trackless tack. Additional results showed that moisture conditioning and high temperature reduced interface shear strength, while rougher and controlled-textured surfaces improved bonding performance. Mechanistic-empirical pavement analysis showed that reduced bonding between asphalt layers can increase predicted pavement distresses, including rutting, fatigue cracking, and International Roughness Index. Finite element modeling using a cohesive zone approach was used to simulate interface shear stress and was validated with laboratory direct shear test results. Other detailed results are presented in the report. Overall, this study provides NMDOT with practical guidelines for tack coat selection, residual application rate, curing time, surface preparation, and quality control to help reduce the risk of interfacial delamination in asphalt pavements.
  • Format:
    PDF
  • Funding:
    C06372
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:e5ac8539832c9c48cd62e0fe12bc4abdee587198057e8c51139e007e2a4b5bac7e1f37a8478841681c7b9495b1e13a6742fbbacb8bd61fb0548c62575f41e2ae
  • Download URL:
  • File Type:
    Filetype[PDF - 7.88 MB ]
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