The evaluation of crumb rubber as a filler in asphalt mixture to against moisture sensitivity

Abstract

In Malaysia, road pavements are frequently damaged by the accumulation of water on the surface caused by heavy rain, due to the humid climate. The presence of water within the asphaltic concrete mixture particles may impede their workability. Exposure towards natural phenomenon such as rain can be the main cause related to the presence of water inside the asphalt pavements. To improve road conditions for users, it is necessary to consider alternative road pavement designs. This study proposes using rubber crumb as modifier as its water-impermeable characteristic will be able to enhance the performance of standard asphalt mixtures to reduce asphalt mixtures moisture sensitivity. Subsequently, the Marshall Mix Design method was utilized to conduct Indirect Tensile Strength tests in order to achieve the objectives of this study. A total of 16 samples were prepared for this study, comprising of standard asphaltic combinations as well as asphaltic mixtures with different percentages of crumb rubber (0%, 4%, 6%, and 8%) relative to the overall weight of the asphalt mixtures. In comparison to the typical way of asphaltic mixture, the sample that utilized crumb rubber as a modifier had a substantially greater value of strength based on the Indirect Tensile Strength Test results. As expected from the findings of the study, the presents of water in asphalt mixtures reduces the asphalt mixtures strength and workability. To conclude, incorporating crumb rubber in asphalt mixtures enhances their effectiveness in resisting moisture sensitivity.