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

It is well known fact that the filed asphalt mixture is aged in the truck while hauling and queuing for one to four hours before dumping for paving. This aging, which is called short-term aging (STA), affect the physical and mechanical properties of asphalt mixture. For example, the maximum theoretical density of mixture is changed before and after STA. Therefore, when the asphalt concrete specimen is prepared for testing various properties in laboratory, the mixture should be STA conditioned by the most-likely STA condition in the field. This is the reason why the STA should be performed properly. This study initiated to investigate STA conditioning protocols, set forth many agencies in Korea, and to suggest a proper STA protocol which simulates field HMA condition as most likely as possible. According to this study, it was possible to suggest a STA protocol for the blended loose mix for one specimen poured in an open canister. Based on the data and methodology used in this study, an example normal STA protocol was suggested that the blended normal HMA mix should be kept in a drying oven (no forced draft) at 160 ﾠ± ﾠ2°C for 72 ﾠ± ﾠ5 min. This protocol was based on the assumption that the absolute viscosity level of the recovered binder after STA should be similar to the RTFO-run AV level of the same binder.