The results indicate that the dry contraction coefficients of lean concrete is less than common concrete, and it will be reduced when the high quality fly ash is added in the lean concrete.
结果表明，贫混凝土的干缩小于普通混凝土，而且掺加优质粉煤灰后，可降低收缩值。
Fly ash can be take as high quality admixture of concrete.
处理后的粉煤灰可作为优质的混凝土掺合料。
The fly ash of inferior quality produced in Chongqing can be used to construct high-strength bases.
试验资料证实石灰粉煤灰是一种质高价廉的筑路材料，重庆低质粉煤灰可修筑高强度基层。
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