含气量对浮石轻骨料混凝土抗压性能的影响

Influence of air content on compressive properties of pumice lightweight aggregate concrete

以天然浮石作为粗骨料,研究了引气剂的加入对混凝土抗压性能的影响。结果表明:随着含气量的增加,抗压强度逐渐减小,且浮石轻骨料混凝土抗压强度下降的速度比普通混凝土要快。试验还发现,轻骨料混凝土的破坏形态与普通混凝土存在着差别,裂纹的扩展几乎不受轻骨料阻碍而贯穿轻骨料,致使轻骨料混凝土的破坏过程比较突然,表现出较强的脆性特征。但随着引气剂的加入,改变了浮石轻骨料混凝土的破坏形态,降低了脆性,有效地提高了轻骨料混凝土的韧性。

The experiment focused on the effect of air entraining agent on compressive properties of pumice lightweight aggregate concrete when natural pumice as coarse aggregate.The results show that compressive strength of lightweight aggregate concrete decreases with the increase of air content.The rate of compressive strength of lightweight aggregate concrete decreases is faster than ordinary concrete.It is also discovered in experiments that failure form of lightweight aggregate concrete are different from common concrete.Those cracks run through the coarse aggregate instead of being blocked,causing the breaking abruptly and it shows a stronger brittleness characteristic.But the addition of air entraining agent changes the failure form of pumice lightweight aggregate concrete,reducing its brittleness and improving its toughness effectively.