Designing fine aggregate mixtures to evaluate fatigue crack-growth in asphalt mixtures.

Details

• Creators:
  Izadi, Anoosha ; Motamed, Arash ; Bhasin, Amit
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Subject/TRT Terms:
  • Asphalt
  • Aggregates
  • Building materials
  • Asphalt pavements
  • Cracking
  • Microcracking
  • Cracking of asphalt concrete pavements Asphalt--Microstructure
  • Asphalt--Evaluation
  • Aggregates (Building materials)
  • Pavements, Asphalt--Cracking
• Publication/ Report Number:
  SWUTC/11/161022-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Southwest Region University Transportation Center (U.S.)
• Abstract:
  Fatigue cracking is a significant form of pavement distress in flexible pavements. The properties of the ; sand-asphalt mortars or fine aggregate matrix (FAM) can be used to characterize the evolution of fatigue ; crack growth and self-healing in asphalt mixtures. This study compares the internal microstructure of the ; mortar within a full asphalt mixture to the internal microstructure of the FAM specimen. This study also ; conducts a limited evaluation of the influence of mixture properties and methods of compaction on the ; engineering properties of the FAM specimens. The results from this study, although limited in number, ; indicate that in most cases the SGC compacted FAM specimen had a microstructure that most closely ; resembled the microstructure of the mortar within a full asphalt mixture. Another finding from this study ; was that, at a given level of damage, the healing characteristic of the three different types of FAM mixes ; was not significantly different. This indicates that the healing rate is mostly dictated by the type of binder ; and not significantly influenced by the gradation or binder content, as long as the volumetric distribution ; of the mastic was the same. In other words, the inherent healing characteristics of the asphalt binder plays ; a more significant role relative to other properties (e.g. volumetrics) in the overall fatigue ; cracking resistance of the asphalt mixture.
  More +
• Format:
  PDF
• Funding:
  10727
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23107/dot_23107_DS1.pdf
• File Type:
  [PDF - 3.94 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:4b8ab6ad9c761513d5def8b93ed05be68de0dfddae1ea41d09e6b10bf124c2728a56635d081f5150a2d06d75a4488c2a78a0f374e89f0ea61b706d4e3392b7c5