粉煤灰部分取代石灰石粉的水泥胶砂干缩性能研究

Effect of Fly Ash Partially Substituting Ground limestone on the Dry Shrinkage Performance of Cement Mortar

通过测定水泥胶砂不同龄期干缩率,分别研究了石灰石粉、粉煤灰单掺以及石灰石粉和粉煤灰双掺对水泥胶砂干燥收缩性能的影响。结果表明:随着石灰石粉掺量增加,胶砂干燥收缩先增大后减小,石灰石粉掺量为10%左右时胶砂干燥收缩最大;胶砂干燥收缩随粉煤灰掺量增加先减小后增大,粉煤灰掺量10%左右时,胶砂干燥收缩最小;石灰石粉掺量一定时掺入粉煤灰可以减小胶砂干燥收缩。

In this paper, the effect of only addition of ground limestone or fly ash and double addition of ground limestone and fly ash on cement mortar were studied by testing dry shrinkage at different ages. The results indicated that the dry shrinkage of mortar increase with ground limestone content increasing at first, when the replacement of ground limestone was about up to 10% the dry shrinkage achieved maximum. Fly ash could decrease the dry shrinkage of mortar at first, the replacement of fly ash was up to 10%, the dry shrinkage achieved minimum, then the replacement of fly ash increased, the dry shrinkage increased. The addition of fly ash could effectively decrease the dry shrinkage when the replacement of ground limestone was not changed.