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用普通硅酸盐型水泥配制的混凝土,含有一定量的游离氢氧化钙(约为水泥重量的18~20%),它易与酸类及侵蚀性盐类起反应,使混凝土的抗腐蚀能力下降。这种混凝土不能满足抗腐蚀建筑物的要求。与波特兰水泥相比较,在常温条件下硬化的高铝水泥,不生成游离氢氧化钙,水泥石中的水化铝酸钙仅微溶于水,在液相中形成的钙矾石不引起膨胀破坏作用。同时,水化时生成的铝胶,使水泥石结构紧密,并包裹在水化铝酸钙晶体
The concrete formulated with ordinary silicate cement contains a certain amount of free calcium hydroxide (about 18 to 20% of the weight of the cement). It easily reacts with acids and aggressive salts to make the concrete resistant to corrosion. decline. This kind of concrete can not meet the requirements of anti-corrosion buildings. Compared with Portland cement, high-alumina cement hardened at room temperature does not generate free calcium hydroxide. Calcium hydrated aluminate in cement stone is only slightly soluble in water, and ettringite formed in the liquid phase is not Cause expansion and destruction. At the same time, the aluminum glue produced during hydration makes the cement stone structure compact and wraps around the hydrated calcium aluminate crystals