USE OF ASTM TESTS TO PREDICT LOW-TEMPERATURE STIFFNESS OF ASPHALT MIXES

This investigation tested the reliability of ASTM tests to predict low-temperature stiffness of mixes made with a wide variety of asphalts. Mix stiffnesses obtained from creep tests performed with a new low-cost non-destructive method on ordinary Marshall or Hveem specimens were compared with ASTM stiffnesses. The relationship reported between thermally induced pavement cracking and Tl or the temperature at which the 10,000-sec asphalt stiffness is 20,000 psi (138 000 5Pa) is qualitatively supported by field tests. Tl estimated from ASTM penetration at 39.2 F (4 C), along with the ASTM penetration at 77 F (25 C) or the viscosity at 140 F (60 C) on rolling thin film (RTF-C) oven residua, correlates well with the measured Tl. The use of penetration at 39.2 F (4 C) is supported as a specification requirement. Good correlation was also found on asphalts recovered from the mixes. Tl correlated poorly with penetration at 77 F along with softening point or viscosity at 140 F on both RTF-C and recovered residua. Tl estimated from viscosities at 140 F, along with viscosities at 275 F on RTF-C or recovered residua, show no correlation with measured Tl. Resistance to low-temperature thermally induced cracking should not be implied on diverse types of asphalts from high-temperature viscosity measurments. Ductilities at 45 F show no correlation with L. A modified asphalt test data chart that permits the low-temperature stiffness of asphalts to be determined from normal ASTM penetration tests is given.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 35-45
  • Monograph Title: Asphalt properties and performance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00128540
  • Record Type: Publication
  • ISBN: 0309023998
  • Files: TRIS, TRB
  • Created Date: May 14 1976 12:00AM