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碳酸钾由于其共晶温度很低(-37.55℃)以及对水泥有强烈促凝作用而一直被人们当作一种优良的防冻剂来研究。但在建筑工程中始终没有得到广泛应用,原因一是它太贵,二是凝固过快和混凝土后期强度损失较大。但是,当使用碳酸钾和碳酸钠的混合物时,由于生产方法简便和省去昂贵的提纯工艺,成本就可以大大降低,再采用复合其它外加剂的途径改善其凝固过快和后期强度偏低的不良性能,这种新的防冻剂就能实际应用到工程上。一、防冻早强剂的性能首先,利用化工厂的含碱废液,经适当化学处理后可得到碳酸钾和碳酸钠的混合盐。废液中的钾
Potassium carbonate has been considered as an excellent antifreeze agent due to its low eutectic temperature (-37.55°C) and its strong coagulation effect on cement. However, it has not been widely used in construction projects. One reason is that it is too expensive, and the second is excessive solidification and a large loss of strength at later stages of concrete. However, when a mixture of potassium carbonate and sodium carbonate is used, since the production method is simple and the expensive purification process is omitted, the cost can be greatly reduced, and the method of compounding other admixtures can be used to improve the solidification speed and the low strength of the later stage. With poor performance, this new type of antifreeze can be applied practically to engineering. First, the performance of antifreeze early strength agent First of all, the use of chemical plants containing alkali waste, after appropriate chemical treatment can be mixed potassium carbonate and sodium carbonate salt. Potassium in waste