Title: Development of Asphalt Pavement Analyzer Design Criteria for Surface Mixtures
Abstract: Premature rutting of asphalt pavements is a serious concern experienced in recent years due to the increased traffic and wheel loads. The most part of early rutting occurs within the first year of the service life of the pavements. Though premature rutting does not indicate the structural failure of the pavement, it is a major serviceability failure. Thus, it is important to estimate the rutting potential of a mixture before construction. There are several accelerated loaded wheel testers in practice to evaluate the rutting potential of the asphalt concrete mixtures. A growing number of highway agencies, contractors, and commercial testing laboratories use the Asphalt Pavement Analyzer (APA) for HMA testing. The APA test is not a fundamental test for permanent deformation. It is a simulative test, simple to perform and uses cylindrical specimens compacted using the Superpave gyratory compactor (SGC). Various studies have demonstrated the performance of the APA. This paper compares the APA test results with the repeated shear at constant height test results obtained on a large variety of asphalt mixtures. Correlations were developed between the results of Shear and APA tests and further APA rut depth criteria were developed, which can be used to characterize the rut resistance of surface mixtures. The regression models were fine-tuned to characterize the rutting behavior of each individual mix by considering effects of test temperatures, aggregate types and traffic volumes. It was observed that presence of natural sand increases the rutting potential of a mixture. Granite aggregate was slightly more rut resistant than limestone aggregate in case of mixtures not containing any natural sand.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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