蒸压粉煤灰砖的抗冻耐久性寿命预测模型

摘要

In cold area,the freeze-thaw cycle is the primary influence factor on the durability of fly ash brick.The paper researches the loss ratio of relative dynamic elastic modulus according to the ultrasonic speed of the fly ash brick after suffering different freeze-thaw cycles,and the corresponding numerical model is established.The result indicates that the calculated results by the model can fit the experimental data well.Meanwhile the modelcan be applied to predict the service life and dynamic elastic modulus loss ratio by introducing environment parameters.%在寒冷地区,抗冻性是影响蒸压粉煤灰砖耐久性的重要因素之一.本论文通过测试不同冻融次数下,超声波在粉煤灰砖中传播的声速值,从而得到冻融过程中的弹性模量损失率,并通过动弹模损失率来建立相应的冻融损伤预测模型,结果显示,计算结果与试验结果基本一致,可以用于评价蒸压粉煤灰砖在冻融过程中动弹模损失规律.