大掺量粉煤灰自密实混凝土抗冻性能的试验研究

Study on frost resistance of self-compacting concrete with high volume fly ash

为研究自密实混凝土掺入大量粉煤灰后抗冻性能的影响,分别以粉煤灰等量取代水泥40%、50%和60%配制自密实混凝土进行冻融循环试验研究。结果表明:100次循环后试块质量损失率随粉煤灰掺量增加而增加;自密实混凝土内部与外界连通的裂缝随着冻融次数的增多而增多,使得含水率逐渐增加;粉煤灰掺量40%时自密实混凝土的抗冻性能试验结果最好。

To study the effect of high volume fly ash to frost resistance of self - compacting concrete, respectively, it replace the same amount of cement by 40% ,50% and 60% fly ash to compound self - compacting concrete, then self - compacting concrete subjected to freezing thawing cycles.The results show that the mass loss rate of self - compacting concrete increases with the volume of fly ash after 100 times. Internal crack of self - compacting concrete increase with the number of freezing - thawing so that the moisture content grad- ually increase, which is in communication with the outside world. Frost resistance of self- compacting concrete is best when the volume of the fly ash is 40%.