THE EFFECT OF AGGREGATES QUALITY ON MOISTURE SUSCEPTIBILITY OF HOT MIX ASPHALT

Aggregates make up the most of total volume of hot mix asphalt, and hence, it is necessary to ensure that the aggregates used were suitable for the asphaltic mixture. The objective of this study is to evaluate the effect of using different aggregates on asphaltic mixture with additional of two different anti-stripping agents, namely 2% hydrated lime and 0.5% Wetbond-SP, to assess the moisture susceptibility of the asphaltic mixture. There were three laboratory tests conducted, which are Marshall, Cantabro Loss, and Indirect Tensile Strength tests and there were three natural aggregates used in this study. From the research results, it was found that adding hydrated lime and Wetbond-SP could improve the stability of the specimens constructed with Aggregate B and Aggregate, but not with Aggregate A. Based on the Cantabro Loss and the ITS tests, it could be concluded that Wetbond-SP was more effective to improve the moisture susceptibility of the asphaltic mixture regardless of which aggregate was used, than the hydrated lime.