Experimental Study of Waterproof Bonding Layer for Concrete Deck of Qingshan Changjiang River Highway Bridge in Wuhan

To ensure the construction quality of waterproof bonding layer for concrete deck of Qingshan Changjiang River Highway Bridge in Wuhan, experimental studies were carried out to examine the shot-blasting schemes and amount of bonding agent in treating the concrete surface. Two shot-blasting schemes were adopted to treat the concrete surface, and proper times of shot-blasting were determined via observing the interfacial effect after blasting and the blasting depth. Different amounts of bonding agent were sprayed to the area revealing good blasting effect. After hardened, the pull-out strength of the waterproof bonding layer was analyzed to figure out the optimum amount of bonding agent. The permeability of the waterproof bonding layer with the optimum amount of bonding agent as well as the shearing performance of the waterproof bonding layer with different amounts of bonding agent were checked. The results show that the interfacial roughness degree and roughening depth of the concrete surface are obviously better after blasted twice. When the amount of bonding agent is of 0.6 kg/m2, the pull-out strength of waterproof bonding layer reaches the maximum value of 2.15 MPa, basically impermeable. And the anti-shearing strength is of 3.01 MPa, meeting the design requirements. © 2020, Journal Press, China Railway Bridge Science Research Institute, Ltd. All right reserved.