Permanent deformation and moisture susceptibility related aggregate tests for use in hot -mix asphalt pavements
Abstract
This study was based on the elements of the National Cooperative Highway Research Program (NCHRP) Project 4-19 that focused on the aggregate tests related to the permanent deformation and moisture susceptibility of Hot Mix Asphalt (HMA) pavements. Five coarse and six fine aggregates were used in this research program. The effect of these aggregates on the HMA pavement performance was assessed by constructing and testing test sections in the Indiana Department of Transportation/Purdue Accelerated Pavement Testing (INDOT/Purdue APT) facility located in West Lafayette, Indiana. The relationships between the aggregate properties and the HMA pavement performances were analyzed using statistical and regression analyses. The uncompacted voids content of coarse aggregate was found related to the rutting performance of coarse-graded HMA mixtures. The higher the uncompacted voids content value, the higher the resistance of HMA pavements against rutting. The uncompacted voids content of fine aggregates was related to the rutting performance of fine-graded HMA mixtures. The rutting resistance increases with the uncompacted voids content of the fine aggregate. This study also observed that the in-place binder film thickness was related to the rutting performance of fine-graded HMA pavements. The thicker the binder film, the lower the rutting resistance. The methylene blue value (MBV) and the amount of material passing the 0.075 mm sieve (p0.075) of the fine aggregate were related to the stripping potential of fine-graded HMA mixtures. The rutting performance of the fine-graded HMA mixtures under wet conditions was also related to the uncompacted voids content of the fine aggregate. This study also found that the in-place binder film thickness and methylene blue value of p0.075 were significantly related to the rutting performance of the fine-graded HMA mixtures tested under wet conditions. The thicker the binder film and the higher the MBV of p0.075 material, the lower the rutting resistance of HMA mixtures tested in wet conditions.
Degree
Ph.D.
Advisors
Haddock, Purdue University.
Subject Area
Civil engineering
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