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.
Highlights
Workability of hot mix asphalt (HMA) illustrates characteristics associated with the construction of the HMA layer, namely being placed, worked by hand, and compacted (Gudimettla et al 2003)
According to Vietnamese Standard TCVN 8820–2011, for dense-graded HMA mixtures, it is possible to determine design asphalt content (AC) when air voids of the HMA mixture are equal to 4.0%
This study has developed the workability index for assessing the workability of hot mix asphalt mixtures
Summary
Workability of hot mix asphalt (HMA) illustrates characteristics associated with the construction of the HMA layer, namely being placed, worked by hand, and compacted (Gudimettla et al 2003). An HMA mixture, which has higher workability, can be more compacted. Low workability may affect durability and stability of the HMA mixtures in field construction. It is not proper to use an HMA mixture which is very workable, because it may show a poor rutting performance under repeated traffic loads (Haryanto, Takahashi 2007a). Dynamic stability (DS) of WTT is a good parameter for assessing rutting potential of HMA mixtures (Haryanto, Takahashi 2007b). Those devices are expensive and have not been widely available in developing countries
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