Journal of the Korean Asphalt Institute ISSN:2234-0785(Print) 2635-9553(Online) 한국아스팔트학회지

The tensile strength (St) of asphalt concretes is a measure of resistance against tensile stress induced by traffic loading at the bottom of asphalt concrete layer. In this study, St is measured by indirect tensile strength test at 25, 5, -5, -15 and -25°C. From the St test curve, toughness (Tu) was also calculated and evaluated together with St. Evotherm (EV) and wax compound (WC) were used to produce warm-mix asphalt (WMA) mixtures at 135 C in the laboratory. Two polymers, LVM and SBS, were used for producing polymer modified WMA and hot-mix asphalt (HMA) concretes. All HMA concretes evaluated in this study showed St increase by temperature decrease, peaking at -15°C and then decrease at -25°C. The St and Tu values of WMA concretes, however, showed minor or no decrease at -25°C. Therefore, it was concluded that the WMA concretes had stronger tensile properties than HMA mixtures at low temperatures, even though they were produced at a relatively lower aggregate- heating temperature.