把不同粉煤灰掺量的混凝土试件浸泡在超纯水中,通过表面渗透测试仪定期检测混凝土试件的表层渗水系数,研究粉煤灰对混凝土表层渗透性能的影响.结果发现:掺入粉煤灰量的大小对表层渗水性能的影响较大,标准养护28 d后,掺入比例为15％的粉煤灰混凝土和普通混凝土相比,表层渗水系数减小,当粉煤灰量达到30％时,表层渗水系数与普通混凝土几乎相等;随着浸泡龄期的增长,混凝土表层渗水系数不断减小;浸泡150 d后,两种粉煤灰掺量混凝土的表层渗水系数仅为普通混凝土试件的40％左右.
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