Our Tenth Anniversary of Applying the Direct Tension Test and Critical Cracking Temperature Test Results to Paving Asphalts

During the past 10 years (1999-2009), our research work at the University of Calgary has led us to realize that the challenge of running the Direct Tension Test (DTT) was well worth the effort; because when the samples were prepared properly, the various DTT results and the critical cracking temperature (Tcritical) allowed us to gain many insights into paving asphalt. The DTT and Tcritical techniques have been applied to study various types of paving asphalt, i.e., straightrun asphalt, air-blown asphalt, Polymer Modified Asphalt (PMA), aged asphalt, wax-containing asphalt, crumb rubber modified asphalt, recycled Low-Density Poly-Ethylene (LDPE) modified asphalt, asphalt from different crude sources and asphalt modified with used lubricating oil. In addition to the DTT failure stress and failure strain values, the DTT failure energy and secant modulus were studied, which allowed us to better evaluate the low-temperature properties of paving asphalts. In this paper, experience gained through testing these paving asphalts is discussed and summarized. A comparison of the DTT and Tcritical low-temperature parameters, as well as other tests such as the elastic recovery test, multiple creep and recovery tests, and SuperpaveTM Bending Beam Rheometer (BBR) tests, are discussed.

Language

  • English

Media Info

  • Pagination: p. 31-50

Subject/Index Terms

Filing Info

  • Accession Number: 01149427
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: TAC
  • Created Date: Jan 28 2010 7:32AM