2023 Volume 78 Issue 2 Pages I_298-I_308
The authors studied a method for evaluating concrete surfaces, focusing on air permeability and moisture content, in order to reduce defects related to adhesion between the waterproofing layer and the concrete surface. Specifically, concrete specimens with different air voids and water content conditions were prepared, and the surface properties of the concrete were evaluated by air permeability tests and a newly devised asphalt pouring test.In addition, tensile adhesion and blistering resistance tests of the waterproofing layer were conducted to evaluate the effects of different pore voids and moisture content of the concrete on the waterproofing layer. The results showed that if the air permeability is large and the number of asphalt swellings is high, the tensile bond strength may decrease, resulting in pinholes and blistering of the waterproof layer. It was also found that curing the concrete to increase its denseness may reduce the defects in the adhesion between the concrete and the waterproof layer.
