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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
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.|
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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|CR-80-5.pdf||1.42 MB||Adobe PDF|