Research on the compatibility of waterproof layer materials and asphalt mixture for steel bridge deck

摘要

The current structure of the steel bridge deck often made of steel plate, waterproof adhesion layer (WAL) and paving layer (wearing course and protecting course). The WAL acts as an interlayer between the bridge deck and the paving layer, which enhances the interface adhesion and ensures the pavement layer can follow the deformation of the steel plate well. In addition, it constitutes the barrier against the environmental agent, especially the water. Therefore, it is crucial to understand the interfacial adhesive performance of the WAL, namely its adhesion to the coatings of steel and asphalt mixture. To improve the level of the design for the steel bridge deck, the compatibility of WAL and asphalt mixture (such as epoxy asphalt concrete (EA) and guss asphalt concrete (GA)) is the focus of discussion. In this paper, the orthogonal experimental is used to study the adhesive behavior of the epoxy binder and methacrylate-based adhesive (MMA) and steel plate under the influence of various factors such as the anticorrosive layer, temperatures, spraying quantity. Following the determination of optimal scheme, a WAL-asphalt mixture sandwich specimen was subjected to tensile and shear tests, to evaluate the compatibility of the WAL and protecting course. The results show that the anticorrosive layer is necessary and feasible to improve the interfacial adhesive property. Shear strength and bond strength are easily affected by temperature and decrease with the increase of test temperature. Sometimes, an increase in the spraying quantity of the adhesive layer may decrease the connection efficiency. The MMA material shows poor compatibility with EA, and the epoxy binder has better compatibility with EA. Finally, it is recommended to use the "GA + 1. 5 kg/m(2) MMA + anticorrosive layer + steel plate" scheme for perennial high-temperature zone; the "EA + 0.6 kg/m(2) epoxy binder + anticorrosive layer + steel plate" scheme for the zone with small temperature difference; and the "EA + 1.0 kg/m(2) epoxy binder + anticorrosive layer + steel plate" scheme for low-temperature zone. (C) 2020 Elsevier Ltd. All rights reserved.