Comparative Study of Fatigue of Asphalt Concrete Mixed with AC 60-70 and Polymer Modified Asphalt Binder

Abstract

Asphalt concrete pavement in Thailand is very important and accounts for 94 % of all roads. Over time, these roads become damaged with repeating loading being an important concern. This study used the Indirect Tensile Fatigue Test (ITFT) to investigate the engineering properties of asphalt concrete at 40 ºC to quantify the fatigue life of asphalt concrete mixed with the AC 60-70 binder and polymer modified asphalt (PMA) binder. Two types of gradation for aggregate in this study were tested: Upper Limit gradation and Lower Limit gradation. Based on the ITFT, the results of fatigue resistance of asphalt concrete depended on the type of asphalt binder and the gradation of aggregate. Asphalt concrete mixed with the PMA binder had a better fatigue life than asphalt concrete mixed with the AC 60-70 binder. In addition, specimens with the Lower Limit gradation had better fatigue life than those with the Upper Limit gradation.