Numerical Modeling of Asphalt Crack Resistance

Details

• Creators:
  Mahmoud, Enad ; Abdallah, Imad N. ; Renteria, David ; Yanez, Roberto ; Nazarian, Soheil
• Corporate Creators:
  University of Texas at El Paso
• Corporate Contributors:
  Southern Plains Transportation Center ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. University Transportation Centers (UTC) Program
• Subject/TRT Terms:
  • Aggregate gradation
  • Asphalt mixtures
  • Cracking
  • Granite
  • Limestone aggregates
  • Mathematical models
  • Porous pavements
  • Superpave
  • Asphalt
  • Numerical Modeling
  More +
• Publication/ Report Number:
  SPTC14.1-47-F
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report March 2015 – May 2019
• Corporate Publisher:
  Southern Plains Transportation Center
• Abstract:
  A numerical model of the Overlay Tester (OT) and Semi-Bending Circular (SCB) test were developed. The developed models combined DEM with imaging techniques to study asphalt mix crack resistance. The materials and mixes selected covered wide range of aggregate gradations, strength, and shape properties, the mixes included were: Superpave-C, CMHB-C, and PFC, while the aggregates were: a hard limestone, soft limestone, and granite. Split tensile testing results for the nine combinations of mixes and aggregates were available in addition to the modulus, compressive strength, and split tensile for the aggregates. Results clearly indicate that the heterogonous OT-DEM model has a much better potential than the homogenous model. Further analysis indicated that the use of rigid walls to simulate the loading plates improved the simulation results. Finally, heterogeneous SCB-DEM simulations were conducted for all three mixes with three notch sizes (25.4 mm, 31.75 mm, and 38.1 mm), the numerical simulations were reliable for Superpave and CMHB mixes, the test is not recommended for mixes with high air void content, which manifest itself in this model as very weak mastic (very low bond strength), such as PFC.
• Format:
  PDF
• Funding:
  DTRT13-G-UTC36
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/62285/dot_62285_DS1.pdf
• File Type:
  [PDF - 1.60 MB]
• Collection(s):
  University Transportation Centers
• Main Document Checksum:
  urn:sha256:ba410b426a9e3b5995431e982e57747e33ff68f584c02d5450229962e8348d61