高钙粉煤灰中f-CaO对砂浆收缩的补偿作用

通过对高钙粉煤灰水泥砂浆和低钙粉煤灰水泥砂浆干燥收缩和自生收缩的系统试验和比较分析 ,发现高钙粉煤灰中的f CaO水化产生的膨胀可补偿砂浆的干燥收缩和自生收缩 ,对低水胶比水泥基材料自生收缩的补偿作用更加明显。高钙粉煤灰可能是解决低水胶比高性能混凝土过大自生收缩难题的一种廉价有效的活性掺合料

THE COMPENSATION EFFECT OF f-CaO IN HIGH CALCIUM FLY ASH ON THE SHRINKAGE OF THE MORTAR

The expansion produced by the hydration of the free lime in high calcium fly ash could compensate the drying shrinkage and autogenous shrinkage of the mortar,by means of the systematic experiments and comparative analyses to the drying shrinkage and the autogenous shrinkage of the high calcium fly ash and Class F fly ash cement mortar.The compensation effect was more obvious to the autogenous shrinkage of the cement|based materials with low cement|binder ratio.The high calcium fly ash may be a kind of cheap and effective active addition that can solve the problem of higher autogenous shrinkage accompanied with the high performance concrete with low cement|binder ration.