粉煤灰掺量对混凝土抗冻性能影响的试验研究

Test study on influence of fly ash content on frost resistance of concrete

文中采用快速冻融循环试验方法,探讨了不同混凝土强度等级、相等水胶比情况下粉煤灰掺量对混凝土抗冻耐久性的影响规律。试验结果表明:随着冻融循环次数的增加,相对动弹模量逐渐降低,混凝土的质量损失率与冻融损伤累积度逐渐增大。结合损伤力学和数值分析的方法,基于相对动弹模和质量损失率劣化规律,建立混凝土冻融损伤模型和剩余使用寿命预测模型。

Based on the rapid freeze-thaw cycle test method, the paper discusses the influence of fly ash content on frost resistance durability of concrete under different concrete strength grades and equal water-binder ratio. The test results show that, with the increase of freeze-thaw cycles, the relative dynamic modulus of elasticity decreases gradually, and the mass loss rate and the cumulative degree of freeze-thaw damage of concrete increase gradually. Combining with the damage mechanics and numerical analysis methods,based on the law of relative dynamic elastic modulus and deterioration of mass loss rate, the freeze-thaw damage model and residual service life prediction model of concrete are established.