Abstract
Shear fatigue damage to the waterproof cohesive layer has not received enough attention in bridge deck pavement design. Meanwhile, there is less theoretical basis for the design of a waterproof cohesive layer. In this study, direct shear and shear fatigue tests were used to compare the shear strength and fatigue performance of waterproof adhesive materials under different disposal schemes for a cement slab surface, bonding materials, and spreading schemes, and the recommended optimal dosage of waterproof adhesive material for the bridge deck is given. Based on the shear fatigue tests results of indoor waterproof adhesive materials, an equation for prediction fatigue at 15 °C was established and temperature correction was applied. Based on these results, we propose a waterproof cohesive layer design method for bridge deck pavement with interlayer shear damage as the design index. The life expectancy of the shear damage between the decks was calculated for a real bridge deck. These results provide scientific guidance for design of a waterproof cohesive layer in a bridge deck, which can effectively extend the service life of a bridge deck.
Highlights
At present, most bridge deck pavement structures use a “concrete slab + asphalt concrete”pavement system
The optimum material composition of the waterproof cohesive layer for a bridge deck is presented based on comprehensive consideration of various interlayer construction methods and materials
The interlayer shear fatigue design index for a waterproof cohesive layer in a bridge deck increased in this study, and engineering examples were used for verification
Summary
Most bridge deck pavement structures use a “concrete slab + asphalt concrete”. As an important part of the bridge deck pavement structure, improperly setting the waterproof cohesive layer will result in an insufficient interlayer bonding force or shear strength, damaging the overall pavement structure [2]. Some scholars have developed new waterproof cohesive layer materials to improve the shear strength of bridge deck pavement. The optimum material composition (which corresponds to the maximum shear strength in different test schemes.) of the waterproof cohesive layer for a bridge deck is presented based on comprehensive consideration of various interlayer construction methods and materials. The shear fatigue characteristics of different bridge deck waterproof adhesive materials were studied, and a model for predicting the fatigue life is presented. A method for designing the waterproof cohesive layer for a bridge deck based on shear fatigue damage to the interlayer materials is proposed
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