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用优质粉煤灰取代砼中的部分水泥,是当前利用粉煤灰的途径之一。要取得较好的取代效果,可采取下列措施:1·过量取代所谓过量取代,即粉煤灰的取代量除了等于被取代的水泥量外,还要多加一定量的粉煤灰。只有这样,才能使粉煤灰砼强度不低于原配比砼的强度,其原因是,能与水泥水化释放出来的 Ca(OH)_2起反应生成水化产物的是粉煤灰中占50～60%的玻璃体SiO_2、Al_2O_3。而在水泥熟料中,除 f-CaO、MgO 和 SO_3等有害物质外,矿物组成约占95%,这些矿物组成,都能水化成为胶凝物质,从而产生强度。若粉煤灰是等量
The use of high-quality fly ash to replace part of the cement in Jizhong is one of the ways to use fly ash at present. To achieve better substitution effects, the following measures can be taken: 1. Excessive substitution of the so-called excessive substitution, that is, the amount of fly ash replaced, in addition to the amount of cement being replaced, plus a certain amount of fly ash. Only in this way can the strength of fly ash be not lower than the strength of the original cerium ratio. The reason is that it can react with Ca(OH)2 released from cement hydration to generate hydration products. ~60% of vitreous SiO_2, Al_2O_3. In cement clinker, apart from harmful substances such as f-CaO, MgO, and SO 3, the mineral composition accounts for about 95%, and these mineral components can all be hydrated into a gelled material and thus produce strength. If fly ash is equal