Factors Affecting Cracking of Notched Asphalt Concrete

Asphalt concrete sample cracking testing and analysis in the laboratory is described in this study. A Superpave Gyratory Compactor and a water-cooled masonry saw were used to prepare semi-circular notched specimens. Air void content, mix type, and moisture condition were among varying material properties samples were prepared with. Three-point bending was used to test specimens and a crack was initiated at the notch tip located in the specimen's flat edge center. There was collection of load and horizontal displacement data at different locations in real time. Parameters yielded by the resulting load versus displacement curves for each specimen were used to determine the least susceptible mix type in regard to crack initiation and propagation. There was testing of three different Superpave mixes with a wider air void range under wet and dry and conditions. Crack initiation and ultimate strength of a specimen are little affected by air voids, but in specimens with higher voids, there was faster crack propagation. The crack propagation curve slope reveals that crack propagation damage is more extensive in wet samples, although wet samples were shown to exhibit increased ductility resulting in resisting failure due to cracking. Due to increased interface cracking, more damage was caused by cracking in coarser mixes.

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  • Authors:
    • Tarefder, R A
    • Kias, E M
    • Ng, T
  • Publication Date: 2009-7

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01145257
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 30 2009 3:29PM