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

As a result of research on the crack resistance evaluation test of asphalt mixtures, an improved evaluation method was suggested compared to indirect tensile strength and toughness, which are domestic standards. Indirect tensile strength was associated with an increase in asphalt mixture stiffness rather than crack resistance, and toughness did not show a clear trend. Using tensile energy that reflects indirect tensile strength and strain, the problem of evaluating toughness without considering the thickness and diameter of the specimen was improved. Tensile energy was divided into three types: 1st TE, 2nd TE, and 3rd TE, and each characteristic was evaluated. 1st TE, the tensile energy up to the maximum stiffness limit, was judged to be able to effectively evaluate the change in initial stiffness with the use of PG64-22 and PG76-22 asphalt. In addition, since 1st TE is a dissipation energy that can withstand almost no cracks, it was judged that the higher value, the higher crack resistance. In the process of developing cracks, 2nd TE, which is the dissipation energy up to the maximum load, was a value of a trend that increased with the asphalt content. It was judged that the ductility of the asphalt mixture was highly correlated. After 2nd TE, 3rd TE, the dissipation energy of up to 90% of the maximum indirect tensile strength, rose and fell with increasing asphalt content when PG64-22 was used, but in the case of modified asphalt mixtures, it was on the decline with increasing asphalt content.