Performance of the Overlay Tester in Monotonic and Cyclic Loading Modes

The overlay tester (OT) is considered by several highway agencies as an index test to evaluate the cracking resistance of asphalt mixtures in the laboratory. The OT simulates the reflective cracking mechanism of the opening and closing of joints and/or cracks. The repeatability of the number of cycles to failure measured with the OT is expressed as a concern in reliably characterizing the potential of hot mix asphalt (HMA) mixes to cracking. The work presented in this paper was performed mainly to analyze the repeatability of the number of OT cycles to failure and the fracture energy (FE) measured with the cyclic and monotonic OT methods. The load-displacement curves from the cyclic and monotonic OT tests were compared to select the promising alternative parameters that could serve as surrogate cracking parameters. The performance of the OT test may improve if alternative parameters, such as the maximum load and fracture energy are used to estimate the cracking resistance of the HMA mixes.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 181-191
  • Monograph Title: International Conference on Transportation and Development 2016: Projects and Practices for Prosperity

Subject/Index Terms

Filing Info

  • Accession Number: 01605964
  • Record Type: Publication
  • ISBN: 9780784479926
  • Files: TRIS, ASCE
  • Created Date: Jun 20 2016 3:02PM