RELATIONSHIP OF THE DUCTILITY TEST TO THE FUNDAMENTAL MECHANICAL PROPERTIES OF ASPHALT

DUCTILITIES WERE OBTAINED AT FOUR TEMPERATURES, 25 C(77 F), 18 C(64.4 F), 11 C(51.8 F), 4 C(39.2 F), AND AT TWO RATES OF PULL, 5 AND 1 CM/MIN, ON SEVEN VISCOSITY-GRADED ASPHALT CEMENTS FROM THE BUREAU OF PUBLIC ROADS COOPERATIVE TEST PROGRAM AND ON EIGHT ASPHALT CEMENTS FROM SOURCES SUPPLYING THE ILLINOIS DIVISION OF HIGHWAYS. THE DUCTILITY MEASUREMENTS WERE CORRELATED WITH EACH OF THE FOLLOWING MECHANICAL PROPERTIES: (1) MAXIMUM LOAD REQUIRED TO STRETCH THE DUCTILITY SPECIMENS, (2) DEFORMATION TO MAXIMUM LOAD, (3) PSEUDO-STIFFNESS (MAXIMUM LOAD DIVIDED BY DEFORMATION TO MAXIMUM LOAD), (4) TENSILE STRENGTH IN THIN FILMS, (5) SHEAR SUSCEPTIBILITY (NEGATIVE RATIO OF AN INCREMENT OF LOG VISCOSITY TO THE CORRESPONDING INCREMENT OF LOG RATE OF SHEAR, AND (7) BRITTLE FRACTURE. THE CONCLUSIONS INCLUDE THE FOLLOWING: (1) THERE DID NOT APPEAR TO BE ANY RELATIONSHIP BETWEEN DUCTILITY AND ANY OF THE MECHANICAL PROPERTIES AT ALL TEST TEMPERATURES FOR ALL THE ASPHALT CEMENTS, (2) AT COLD TEMPERATURES (4 C), THE DUCTILITY OF AN ASPHALT IS RELATED TO ITS BRITTLE FRACTURE (FRACTURE TOUGHNESS), (3) AT WARMER TEMPERATURES THERE APPEARS TO BE AN INVERSE STRAIGHT-LINE RELATIONSHIP BETWEEN LOG DUCTILITY AND LOG SHEAR STRENGTH, AND (4) AT A SPECIFIC TEMPERATURE THERE IS PROBABLY AN INVERSE RELATIONSHIP BETWEEN SHEAR SUSCEPTIBILITY AND LOG DUCTILITY. IT WAS FURTHER CONCLUDED THAT THE DUCTILITY TEST IS NOT STRICTLY A MECHANICAL TEST BUT ONE THAT PROBABLY MEASURES BOTH STRENGTH AND CHEMICAL PROPERTIES OF THE ASPHALT. A LINEAR RELATIONSHIP BETWEEN LOG VISCOSITY OF AN ASPHALT AND ITS TENSILE STRENGTH IN THIN FILMS WAS FOUND. /BPR/

  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Urbana, IL  United States  61801

    Illinois Department of Transportation

    Division of Highways, 2300 South Dirksen Parkway
    Springfield, IL  United States  62764

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Herrin, M
    • Marek, C R
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00210431
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Report/Paper Numbers: Ihr-95
  • Files: TRIS
  • Created Date: May 13 1970 12:00AM