粉煤灰对混凝土补偿收缩性能的影响

本文阐述了粉煤灰对普通混凝土和补偿收缩混凝土的收缩膨胀性能的不同影响。指出掺加优质粉煤灰可使混凝土减少用水量，降低收缩值；但却使补偿收缩混凝土的膨胀量降低，原因是粉煤灰的火山灰效应会对水化产物钙矾石的形貌和性能产生影响。

The Influence of Fly-ash on the Shringkage-compensated Properties of Concrete

The different influences of fly ash on ordinary and shringkage-compensated concrete are discribed in this paper. It pointed out that, for the ordinary concrete the water content and shringkage will be also decreased when adding a high-grade fly ash, but for the shringkage-compensated concrete the expansion valumn will be decreased. The causes are the shapes and properties of ettringites, the hydrated prodrcts, to be affected by pozzolanic effect of fly ash.