Flood water resistance of asphalt concrete by using unconfined compressive strength test

High rain intensity which is more than 20 mm/day and poor drainage can cause a flood on the paved road surface and cause surface pavement damage. The previous study stated that measuring the durability of asphalt concrete with Marshall immersion and indirect tensile strength could not show significant differences on asphalt and aggregate gradation types. Therefore, the aim of this study is to measure the durability of asphalt concrete due to flood water by using compressive strength test. Five types of aggregate gradation of Asphalt Concrete and two types of asphalt binder; Asphalt Cement (AC) 60/70 and Elastomer Modified Asphalt (EMA) were used. Marshall method was used to determine optimum bitumen content. While the compressive strength of asphalt concrete was measured by using the unconfined compressive strength test. This study proposed Gradation Index and equivalent retained the strength of compressive strength (ERS-C). ERS-C is an indicator of durability with 0, 1, 2, 4, and 7 days of immersion time. The result showed that ERS-C can be used to determine the effect of aggregate gradation and asphalt types of asphalt concrete. The durability of asphalt concrete at GI 21.527 up to 27.288 has higher ERS-C and the durability of EMA is better than AC 60/70.