试题与答案

某建筑工地欲配制抗压强度等级为C20的混凝土,已知选用42.5硅酸盐水泥,水泥用量为

题型:问答题

题目:

某建筑工地欲配制抗压强度等级为C20的混凝土,已知选用42.5硅酸盐水泥,水泥用量为260kg/m3,水灰比为0.50,砂率为30%,所用石的粒径均为20~40mm,且为间断级配,浇注后检查其水泥混凝土,发现混凝土结构中蜂窝、空洞较多,请从材料方面分析产生蜂窝、空洞的原因。

答案:

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