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Title: Asphalt concrete for cold regions : a comparative laboratory study and analysis of mixtures containing soft and hard grades of asphalt cement
Authors: University of Illinois.
Dempsey, Barry J.
Ingersoll, Jonathan E.
Johnson, T. C. (Thaddeus C.)
Shahin, Mohamed Y.
Keywords: Asphalt cement mixtures
Asphalt concrete tests
Catalytic cracking
Traffic cracking and rutting
Cold weather conditions
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: CRREL report ; 80-5.
Description: CRREL Report
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.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:CRREL Report

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