美国有一种新的防水系统,由两层薄膜组成。4000磅/英寸~2的外层防水薄膜是高密度的聚乙烯,而内层则为每平方英尺1磅的钠膨润土。因钠膨润土是自我密封的,所以即使外层薄膜被损坏了,此防水系统仍然有效。本系统可用于停车库或多层市场、基础墙和楼板的防水,也可用于壅水和水池的里衬。美国还有一种外墙涂料,能防止风雨对多孔墙体的侵入。这 The United States has a new waterproof system consisting of two layers of film. The 4000 pounds/inch to 2 outer waterproof membrane is high density polyethylene and the inner layer is 1 pound per square foot of sodium bentonite. Since sodium bentonite is self-sealing, this waterproof system is still effective even if the outer film is damaged. The system can be used for waterproofing parking garages or multi-storey markets, foundation walls and floors, as well as for lining of drowning and pools. There is also an exterior paint in the United States that prevents wind and rain from invading porous walls. This