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近年来,人们研制了掺有引气剂、防水剂、防水粉、密实剂、减水剂等各种各样的防水混凝土材料,这些外加剂对提高防水混凝土的抗渗性起了良好的作用,使防水混凝土的抗渗值达到了相当高的水平(3MPa以上),但实际使用效果却不稳定。许多工程的水压远低于混凝土的抗渗值,结果渗漏水依然存在。其主要原因是这些外加剂虽然可以提高混凝土的抗渗性,但对提高混凝土的抗裂性作用不大,所以其实用效果不稳定。本文通过对混凝土复合膨胀剂(以下简
In recent years, various kinds of waterproof concrete materials mixed with air-entraining agents, water repellents, waterproof powders, compacting agents, and water-reducing agents have been developed. These additives have played a good role in improving the impermeability of waterproof concrete. The impermeability value of waterproof concrete has reached a fairly high level (above 3 MPa), but the actual use effect is not stable. The hydraulic pressure of many projects is much lower than the impermeability value of concrete, and as a result, the leakage water still exists. The main reason is that although these admixtures can improve the impermeability of concrete, they have little effect on improving the crack resistance of concrete, so its practical effect is not stable. This article through the composite expansion agent for concrete (The following