Kimiharu IWAZAKI
A Comparison of the Rutting Resistance Evaluation Methods of the Asphalt Mixtures
Teruhiko MARUYAMA
Two different laboratory test methods that estimate the permanent deformation susceptibility of asphalt pavements (rutting resistance) were compared. One is the Wheel Tracking (WT) test, which is generally used in Japan, and the other is the Asphalt Pavement Analyzer (APA) lately developed in the USA. The WT test involves a running solid tire wheel over a test specimen, while the APA contains a pneumatic rubber hose laid on specimens loaded by a concave metal wheel. Three kinds of hot asphalt mixture that have different resistance to permanent deformation were examined under these testing devices.
The lateral movements of the aggregates in the hot mix asphalt cross-sections were observed by using a digital image processing. An excellent correlation was obtained between dynamic stability results using the WT tests and the APA under the condition that the lateral movements of aggregates were not much different in both tests
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