In order to study the frost resistance of fly ash concrete under freeze-thaw cycle,the mass loss and relative elastic modulus of the specimen under freezing and thawing cycles were studied by mechanical tests under different freezing and thawing cycles.The results showed that:The mass loss rate of the specimen is 0.84% and the relative elastic modulus is 82.17%.Compared with the concrete content,the mass loss rate of the concrete is about 30%,15% and 40%,respectively.The mass loss rate decreaseds by 0.29% and 0.43%,respectively.The relative elastic modulus increases by 4.31% and 7.22%,respectively.In the range of fly ash content,fly ash can effectively improve the frost resistance of concrete.%为研究冻融循环条件下粉煤灰混凝土抗冻性能,通过对不同冻融循环条件下力学试验,研究冻融循环作用下试件质量损失及相对动弹性模量变化规律,结果表明:粉煤灰掺量对混凝土抗冻性能影响存在最优掺量约为30%,经过90次冻融循环,试件的质量损失率为0.84%,相对动弹模量为82.17%,相比混凝土掺量为15%、40%,质量损失率分别降低0.29%、0.43%,相对动弹模量分别提高4.31%、7.2 2%.在一定粉煤灰掺量范围内,粉煤灰能有效提高混凝土的抗冻性能.
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