冻融循环对粉煤灰混凝土抗冻性能试验研究

Experimental Study on Frost Resistance of Fly Ash Concrete under Freeze-thaw Cycle Condition

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。

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.