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膨胀混凝土的推广应用,开辟了防止混凝土开裂,提高抗渗能力的新途径,这就是国内外广泛推广的收缩补尝混凝土。近年来建材研究院水泥所研究成功的明矾石膨胀水泥,它的水化热较低,原料来源较广,成本也较低,这就为大量用作收缩补尝混凝土提供了有利条件。明矾石膨胀水泥是用58～63％的600号普通水泥熟料、12～15％的明矾石、9～11％的天然石膏和15～20％的粉煤灰(或矿渣)共同粉磨到比表面积为4800±200厘米~2/克而成的。
The popularization and application of expansive concrete has opened up a new way to prevent concrete cracking and improve impermeability, which is widely promoted at home and abroad to compensate for the shrinkage of concrete. In recent years, the Institute of Building Materials Cement successfully studied alunite expansive cement, its low heat of hydration, a wide range of sources of raw materials, the cost is lower, which for a large number of shrinkage to compensate for the concrete to provide favorable conditions. Alunite expansive cement is co-milled with 58 to 63% of ordinary cement clinker No. 600, 12 to 15% of alunite, 9 to 11% of natural gypsum and 15 to 20% of fly ash (or slag) Specific surface area of 4800 ± 200 cm ~ 2 / g made.