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通过混合骨料混凝土的快速冻融循环试验,研究了浮石替代率、聚丙烯纤维、冻融循环次数对混合骨料混凝土抗冻性能的影响。结果表明:相对动弹性模量随着浮石替代率增加而增加;对于一定范围浮石替代率的混凝土,聚丙烯纤维的掺入能够改善混凝土的抗冻性能,浮石替代率为30%,聚丙烯纤维掺量为0.9 kg/m3的混合骨料混凝土,质量损失最小;聚丙烯纤维的掺入能够抑制混合骨料混凝土的冻融损伤,提高混凝土的密实度,减小混合骨料混凝土相对动弹性模量的损失。
The effects of pumice replacement rate, polypropylene fiber, freeze-thaw cycles on the frost resistance of concrete with mixed aggregate were studied by rapid freeze-thaw cycles of mixed aggregate concrete. The results show that the relative dynamic elastic modulus increases with the increase of pumice replacement rate. For concrete with a certain range of pumice replacement ratio, the incorporation of polypropylene fiber can improve the frost resistance of concrete. The pumice replacement rate is 30% The mass loss of the mixed aggregate concrete with the dosage of 0.9 kg / m3 is the smallest. The incorporation of polypropylene fiber can restrain the freeze-thaw damage of the mixed aggregate concrete, improve the compactness of the concrete and reduce the relative dynamic elastic modulus of the mixed aggregate concrete Amount of loss.