The effect of acrylonitrile styrene acrylate on fatigue cracking of asphalt mixtures

One of the effective parameters in the occurrence of fatigue cracking is the bitumen properties used. One way to control this type of failure is to use bitumen, aggregate or asphalt mix modifiers. In this study, the effect of using a polymeric additive called acrylonitrile styrene acrylate (ASA) as a bitumen modifier on the fatigue cracking potential in asphalt mixtures was investigated. Two types of aggregates, with different mineralogical characteristics, bitumen PG 64-16 and ASA additive in two percent of bitumen mass were the materials used in this study that were tested at two temperatures and five different stress levels. Marshall mix design method was used to determine the optimum bitumen percentage and indirect tensile fatigue test method was used to determine the fatigue life of asphalt mixtures. The results of this study show that the use of polymer additives has increased the fatigue life of asphalt mixtures. Fatigue life of specimens made with granite aggregates was longer than that of limestone aggregates, but the longer life of ASA resulted in a greater increase in the lifetime of specimens made of granite aggregates. The increase in temperature and stress level also resulted in a decrease in the fatigue life of the asphalt mixture samples as expected, which was much lower in the bitumen samples modified with polymeric materials. Has been in control.