A Criteria Consideration of Asphalt Binder for Surface Pavement on Expressway

Abstract

At present, Expressway Authority of Thailand (EXAT) has operated 8 expressways covering total length of 224.6 kilometers with 1.91 million trips per day (fiscal year 2019). Therefore, EXAT have to focus on a maintenance work on expressway, especially surface pavement which is firstly support for load from vehicle. Most of the expressways are constructed surface pavement with asphalt concrete type AC 60/70. The problem is each expressway had different traffic volume and types of vehicles which effected to damage of surface pavement in different cases. Currently, there are no criteria to considerate the selection of asphalt binder in the surface pavement maintenance, which may cause the selected asphalt binder is not support the current traffic volume. The misused asphalt binder leads to a un-plan maintenance and   over budget using. The researcher collected relevant theories and research in order to prepare the criteria for selecting asphalt binder for surface pavement on the expressway bring to an effective and worthwhile maintenance.