Microdamage healing in asphalt and asphalt concrete, volume 3 : a micromechanics fracture and healing model for asphalt concrete.

Details

• Creators:
  Lytton, R. L. ; Chen, C. W. ; Little, Dallas N.
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  University of Wyoming Research Corporation. Western Research Institute ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Asphalt
  • Asphalt concrete
  • Cracking of asphalt concrete pavements
  • Viscoelasticity
  • Cracking
  • Tensile strength
  • Strain (Mechanics)
  • Viscoelastic fracture
  • Fatigue damage
  • Tensile fatigue
  More +
• Publication/ Report Number:
  FHWA-RD-98-143;Research Report 7229
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final; Feb. 1998.
• Corporate Publisher:
  Turner-Fairbank Highway Research Center
• Abstract:
  Volume 3 documents the development of a micromechanics fracture and healing model for asphalt ; concrete. This model can be used to calculate the density and growth of microcracks during repeated direct ; tensile controlled-strain loading. The model is based on a relationship among stiffness changes in the mixture as ; damage occurs, the rate of change in dissipated pseudo strain energy as loading are applied to the samples and ; as damage occurs and mixture properties including crack length changes upon loading and mixture cohesive ; surface energies. The report demonstrates that microcrack growth is the dominate mode of distress at ; temperatures below 25C and that microcrack healing is the dominate mode of recovery of dissipated pseudo ; strain energy at these test temperatures. However, at temperatures above about 25C, the predominate mode of ; distress is plastic damage. Cracking rates during fatigue damage are related to de-wetting cohesive surface ; energy measurements of the bitumen whereas microcracking healing rates are related to wetting cohesive surface ; energy measurements of the bitumen. Surface energies of five bitumens with widely different chemical ; compositions were found to correlate strongly with healing properties as defined by viscoelastic fracture and ; healing theory.
  More +
• Format:
  PDF
• Funding:
  DTFH6 1 -92-C-00 170
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25328/dot_25328_DS1.pdf
• File Type:
  [PDF - 4.91 MB]
• Collection(s):
  Federal Highway Administration ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:fad4268df3e7f53df86069e50216216b258649d8e7d9092620eb1144c328b0f92ed902b81e5a4e7b1df000b1fb7bc2af1289f5b63295f2544b1c37056a3dab8d