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,


Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH


Personal Author(s) : Dempsey,B J ; Ingersoll,J ; Johnson,T C ; Shahin,M Y


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a082198.pdf


Report Date : Jan 1980


Pagination or Media Count : 63


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)


Descriptors :   *ASPHALT , *COLD REGIONS , *CONCRETE , STRESSES , CRACKING(FRACTURING) , PAVEMENTS , STRAIN(MECHANICS) , STRENGTH(MECHANICS) , FATIGUE(MECHANICS) , GROUND TRAFFIC , VISCOSITY , THERMAL STRESSES


Subject Categories : Laminates and Composite Materials
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE