Interlaminar Performance of Waterproof and Cohesive Materials for Concrete Bridge Deck under Specific Test Conditions

Abstract

The performance of waterproof and cohesive material significantly affects the service life of concrete bridge deck pavement. In this paper, six kinds of waterproof and cohesive materials including epoxy asphalt, AMP-1, styrene-butadiene-styrene (SBS)–modified asphalt, and asphalt rubber (dosages of rubber power are 17, 19, and 21% respectively) were measured via oblique shear test, pull-off test, and shear test after loading under different test conditions. The impermeability and the influence of aging on material performance were studied. The viscosity and strength characteristics of epoxy asphalt were also studied at different curing times and temperature conditions. Results show that the optimum dosages of epoxy asphalt, AMP-1, SBS-modified asphalt, and asphalt rubber with 17, 19, and 21% rubber powder are .9, .3, .5, 1., .5, and .5 kg/m2, respectively. The shear strength value of epoxy asphalt is the largest at 25°C, followed by SBS-modified asphalt. The shear strength and pull-off strength of several materials decline at different levels under the condition of high temperatures or being soaked in water. The order of shear failure life of the selected waterproof and cohesive materials is epoxy asphalt > SBS-modified asphalt > asphalt rubber (19%) >AMP-1. In various waterproof and cohesive materials, the shear strength and pull-off strength of epoxy asphalt after the aging of a specimen are the largest. Epoxy asphalt shows a good waterproof property under traffic load after the asphalt mixture has been paved. The viscosity change characteristic of epoxy asphalt is closely related to the temperature and curing time. The pull-off strength reaches its peak value after curing for 3 min, which is earlier than shear strength. The epoxy asphalt has a significant performance advantage as a waterproof and cohesive material for a concrete bridge deck.