This paper describes a simple test method for examining the flexural stress-strain properties of laboratory prepared bitumen beam specimens at low temperatures and two low rates of strain. The results discussed are obtained from some 500 tests conducted at temperatures of-10, -20, -30, and -40 degrees F (-26.7, -28.9, -34.4, and -40 degrees C); and rates of strain of 1.0 and 10.0 times 10 to the minus 6 in/in/sec (cm/cm/sec). The asphalts used include a cross-section of the types used in British Columbia up to 1970, a group of recovered asphalts of different age and crack susceptibility taken from in-service pavements, and a group of "new" asphalts believed to have improved cold temperature properties. The results of these tests concluded at low temperatures indicate that there is only very general correlation with the results of tests such as penetration, penetration index, ductility, etc., which are conducted at higher temperatures and higher rates of strain. The results of low temperature testing do, however, appear to predict the temperature at which different asphalts are likely to become crack susceptible at the rates of strain associated with thermal contraction. /AUTHOR/

  • Authors:
    • Hvozdanski, J
    • Darby, R O
    • Wellwood, W D
  • Publication Date: 1972

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  • Accession Number: 00096454
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM