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膨胀水泥是一种特殊的建筑用材,洪水季节防洪抢险、水中作业、快速筑坝,水管、水渠漏水快速塞补,以及灌注一般水泥连续作业,都要求使用膨胀水泥。目前使用的膨胀水泥种类虽多,但价格较昂贵。山西运城地区平陆县的山区群众,利用当地现有的石膏资源,在普通的硅酸盐水泥或高级硅酸盐水泥中,加入相当于水泥重量百分之四十的精细熟石膏粉或废石膏模具炒干的细粉,充分搅拌均匀。
Swelling cement is a kind of special construction timber. Flood protection and flood rescue, water operations, rapid dam construction, fast plugging of water pipes and water drains, and continuous operation of injecting ordinary cement all require the use of expansive cement. Although there are many kinds of expanded cements currently used, they are more expensive. The people in the mountains in Pinglu County in Yuncheng, Shanxi Province, use local existing gypsum resources to add finely-prepared gypsum powder equivalent to 40 percent by weight of cement to ordinary portland cement or high-grade portland cement. Gypsum mold fried dry fine powder, stir evenly.