Determining the Effects of Cross-Anisotropy on Pavement Response and Performance

When layers of a pavement are compacted vertically using vibratory or roller compactors, the compaction forces are not the same in horizontal and vertical direction due to the lack of confinement in the horizontal direction. Later, service traffic adds on to this by applying vertical load and forward impacts. Therefore, materials stiffness may vary along the vertical and horizontal directions. As stiffness is not the same in three directions, the asphalt concrete (AC) layer can be considered to be anisotropic. Unfortunately, to this day, stresses and strains predicted by the recently developed pavement design software as well all other available layered elastic analysis software assume AC as an isotropic material. Isotropic means AC layer material has identical stiffness along 3-directions. Therefore, ignoring AC cross-anisotropy may cause significant error in predicting critical stress and strains, which are used to predict fatigue damage or permanent deformation of a pavement by pavement mechanistic-empirical (ME) design. To this end, it is proposed to study the effects of AC layer cross-anisotropy on pavement responses and predicted fatigue and rutting performances.

Language

• English

Project

• Status: Completed
• Funding: $150000
• Sponsor Organizations:

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  University of Nevada, Reno

  College of Engineering
  Reno, NV  United States  89557
• Performing Organizations:

  University of New Mexico, Albuquerque

  Department of Civil Engineering
  Albuquerque, NM  United States  87131-0001
• Principal Investigators:

  Tarefder, Rafiqul

• Start Date: 20160101
• Expected Completion Date: 20180131
• Actual Completion Date: 20180831

Subject/Index Terms

• TRT Terms: Anisotropic materials; Asphalt concrete; Compaction; Fatigue (Mechanics); Mechanistic-empirical pavement design; Pavement layers; Rutting; Service life; Stiffness
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01595990
• Record Type: Research project
• Source Agency: Center for Advanced Transportation Education and Research (CATER)
• Files: UTC, RIP
• Created Date: Apr 13 2016 11:22AM