Investigation on Indices of Workability and Rutting Resistance for Wearing Course Mixtures

Tran Thanh Nhat; Osamu Takahashi

doi:10.3846/bjrbe.2017.04

Investigation on Indices of Workability and Rutting Resistance for Wearing Course Mixtures

Authors

Tran Thanh Nhat Dept of Civil and Environmental Engineering, Nagaoka University of Technology, 1603–1 Kamitomiokamachi, Nagaoka, Niigata, Japan
Osamu Takahashi Dept of Civil and Environmental Engineering, Nagaoka University of Technology, 1603–1 Kamitomiokamachi, Nagaoka, Niigata, Japan

DOI:

https://doi.org/10.3846/bjrbe.2017.04

Keywords:

aggregate gradation, continuous maximum density, hot mix asphalt mixtures, rutting, stone content, Superpave Gyratory Compaction, workability.

Abstract

Simple indices easily help to evaluate a performance of hot mix asphalt mixtures. This study aimed to develop a simple workability index and rutting resistance index for wearing course mixtures. Seven aggregate gradations were prepared to investigate dense, coarse, and fine-graded hot mix asphalt mixtures. The study used the Marshall compactor to fabricate specimens. The Superpave Gyratory Compaction was employed to measure the workability of the seven blends, namely the workability energy parameter of asphalt mixtures. The study also conducted Wheel Tracking Test to evaluate rutting resistance of those mixtures. The results showed a strong relationship between the workability index and the workability energy of hot mix asphalt mixtures, namely increasing the workability energy of mixtures with increasing the workability index value. The workability energy value of an asphalt mixture may be high when the area of continuous maximum density for a proportion of stone, which illustrates a degree of far away from the Fuller maximum density line, is low. Moreover, the rutting resistance index correlated well with rutting resistance of the hot mix asphalt mixtures.

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