沥青油毡防水层只能与干燥洁净的基层才能产生理想的粘结。汪水的、有水珠的、潮湿的基层表面不仅不能与卷材防水层产生良好的粘结,而且由于施工过程中常把水分或潮气带进各层卷材和沥青之间,致使整个卷材防水层遭到破坏。在地下卷材防水施工中,这种失败的教训是屡见不鲜的。多数地下工程的底板都在地下水位之下,虽然有排水沟,但是混凝土垫层下面的水还是要通过毛细管作用上返到垫层上面来。抹过水泥砂浆找平层后,水就返到找平层上面来。尽管毛细管水的上返过程是缓慢和微弱的,但却常使基层表面呈现汪水、 Asphalt tarpaulin waterproof layer can only produce the ideal bond with dry and clean base. The watery, damp, wet base surface of Wang Shui can not only not produce good adhesion with the waterproof layer of the coil, but also often brings moisture or moisture into the layer between the coil and the bitumen during the construction process, resulting in the entire coil. The waterproof layer was damaged. In the waterproof construction of underground materials, the lesson of this failure is not uncommon. The floor of most underground projects is below the groundwater level. Although there is a drainage channel, the water under the concrete pad is still returned to the pad by capillary action. After wiping the cement mortar screed, the water returns to the screed. Although the capillary water return process is slow and weak, it often causes the surface of the substrate to show water,