Abstract
In this study, the effects of temperature, shear stress, and coating quantity of waterproof adhesive layer on the shear fatigue performance of a steel bridge deck pavement were investigated. Direct shear fatigue tests of a pavement comprising an epoxy resin waterproof adhesive layer with stone matrix asphalt were conducted at different temperatures, stress levels, and coating quantities. The results show that temperature and stress have significant effects on the shear fatigue life. With increasing temperature and stress, the shear fatigue life of the waterproof adhesive layer decreased gradually. Therefore, for steel bridge deck pavements under high temperatures and heavy loads, the use of asphalt waterproof adhesive layers or pavement layers should be evaluated carefully while limiting the traffic of heavily loaded vehicles. Shear failure occurs at the waterproof adhesive layer–pavement interface and not at the steel–waterproof adhesive layer interface. The shear strength of the epoxy resin waterproof adhesive layer is mainly provided by the bond strength between the waterproof adhesive and pavement mixture as well as the interlocking force between the cured epoxy resin and the bottom interface of uneven pavement mixture. The shear strength increases with the coating quantity of the waterproof adhesive layer; however, after reaching the maximum value, the shear strength becomes stable. In contrast, the interlaminar shear fatigue life increases continuously with the coating quantity of the waterproof adhesive layer. Appropriately increasing the coating quantity is beneficial for improving the resistance of the waterproof adhesive layer to interlaminar shear fatigue failure.
Highlights
In the construction of transportation infrastructure, steel bridges are used extensively because of their light weight, low cost, and ease of construction (Liu et al, 2016)
Shear strength tests and direct shear fatigue tests were performed to analyze the influence of temperature, stress, and coating quantity of the waterproof adhesive layer on the shear fatigue performance of a steel bridge deck pavement with SMA as the pavement layer and epoxy resin as the waterproof adhesive layer
10.34 predictive model of shear fatigue life is obtained by temperature correction and data fitting
Summary
In the construction of transportation infrastructure, steel bridges are used extensively because of their light weight, low cost, and ease of construction (Liu et al, 2016). The quality of the steel bridge deck pavement affects driving safety and comfort, it affects the service life and investment benefit of a bridge system. Owing to the complex stresses and poor thermal insulation of steel bridges, the waterproof adhesive layer interface between the steel plate and the asphalt mixture is usually the weakest part of a steel bridge deck pavement structure (Yao et al, 2016), which can cause interlayer displacement problems resulting from higher interlayer shear effects during service (Song et al, 2016; Wang et al, 2018)
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