The relationship between asphalt mixture and crack resistance is difficult to predict because it is influenced by aggregate particle size, aggregate and asphalt interface characteristics, rheological properties of asphalt type, asphalt coating thickness, temperature sensitivity and porosity. For this reason, various evaluation methods of crack resistance have been developed. In Korea, indirect tensile strength and toughness are used as criteria for crack resistance test of asphalt mixture. DC (T), SCB, Fenix test, and OT (overlay test) have been developed and used internationally as crack resistance test methods. In this study, we compared the conventional crack resistance evaluation methods, and developed a direct tensile fatigue test method which was modified with OT method and Fenix method. Crack resistances were evaluated using reclaimed asphalt pavements (RAP) and virgin asphalt mixtures. As a result, direct tensile fatigue test method was evaluated as suitable for evaluation of crack resistance.

Modified asphalt pavements are needed to resolve pavement distress problems like rutting, pot-hole and warm asphalt pavements are needed to solve energy saving, reduction of noxious gasses emission and early traffic opening. To present these two characteristics, we developed polymer-modified warm-mix asphalt binder and mixtures and evaluated their performance by optimizing polymer-modified warm-mix additive. As results, physical properties and rheological characteristics of polymer-modified warm-mix asphalt binder are similar to normal modified binder. And we confirmed that polymer-modified warm-mix asphalt mixtures satisfied quality standard of Ministry of Land, Infrastructure and Transport.