The effect of aggregate and compaction method on the physical properties of hot mix asphalt

Developing countries such as Malaysia have increased the traffic density in commercial vehicles and overloading trucks which cause tire pressure on the roadway and result into rutting and fatigue cracking in roadways. Aggregate plays an important role in influencing the performance of the flexible pavement. This study aimed to determine the effect of aggregates in terms of types and gradation together in compaction of methods on the resulting prop of laboratory performance to compare the various in term of aggregate types, gradations and compaction methods based on the physical properties and resilient modulus. As a comparative study, the study attempted to compare two types of aggregate (granite and limestone) with the two gradations (upper and lower) for each kind of the mentioned aggregates using Marshall and Gyratory Compaction Methods for asphalt mixtures. Two phases were carried out in this research: determining the optimum asphalt content and comparing the mixtures in different type of aggregate, gradation and compaction. The results of the study on the performance of the mixtures indicated that the granite upper mixtures achieved the best results of Marshall stability, fatigue cracking resist and rutting resist for compacted samples by gyratory compactor.