Accession Number:

ADA082198

Title:

Asphalt Concrete for Cold Regions, A Comparative Laboratory Study and Analysis of Mixtures Containing Soft and Hard Grades of Asphalt Cement,

Descriptive Note:

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Report Date:

1980-01-01

Pagination or Media Count:

63.0

Abstract:

PAVEMENTS CONTAINING SOFT ASPHALT CEMENT HAVE BEEN SHOWN IN THE PAST TO BE LESS SUSCEPTIBLE TO LOW-TEMPERATURE CONTRACTION CRACKING, BUT MORE SUSCEPTIBLE TO TRAFFIC-LOAD-ASSOCIATED DISTRESS IN WARM WEATHER, THAN PAVEMENTS WITH HARDER ASPHALT CEMENTS. This research comprised laboratory testing to determine the properties of asphalt-aggregate mixtures containing three grades of asphalt cements, and analyses to project the performance of pavements containing each of the asphalts, in resisting thermally induced distress and traffic-associated distress. From the results it is concluded that only the softest asphalt cement tested AC 2.5 would perform satisfactorily in a cold climatic zone. The moderately soft AC 5 and moderately hard AC 20 asphalt cements showed little susceptibility to thermal cracking in a moderate and a warm climatic zone, respectively. The AC 2.5 and AC 5 asphalts are not recommended for use in warm climates, however, owing to increased susceptibility to rutting under traffic. Author

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE