Construction technology of warm and hot mix epoxy asphalt paving for long-span steel bridge

Epoxy asphalt concrete (EAC) is widely used in long-span steel bridge paving due to its good performance. It can be classified into two types of materials based on its construction temperature: warm mix epoxy asphalt concrete (WEAC) and hot mix epoxy asphalt concrete (HEAC). While many previous researchers have conducted studies in material designs and performance evaluations, few studies have demonstrated the construction technology of EAC in steel bridges. Additionally, few studies have been conducted to help managers select the appropriate EAC type. This study carried out a preliminary evaluation and comparison on the construction conditions and technologies of WEAC and HEAC. The viscosity properties of epoxy asphalt binder are characterized first to determine the construction temperature and allowable construction duration. The construction procedures including material storage, steel deck pretreatment, tack coats application, mixing and compaction of EAC, construction vehicles management, construction duration, and curing time are detailed. The situations under which WEAC or HEAC can be used are also discussed. Generally, WEAC is suitable for the use of new bridge paving in dry regions, while HEAC is more appropriate for the use in the maintenance and rehabilitation of bridge deck pavements with heavy traffic. Selection of the EAC type for a specific steel bridge paving project should take into consideration various factors such as construction requirements and environmental impact.