配合比设计参数对高性能混凝土抗冻性敏感特性的影响

Influence of mix-designed parameters on frost thaw resistance of high performance concrete

为考察不同配合比设计参数对高性能混凝土抗冻性敏感特性的影响规律和显著性关系,利用正交试验方法,选取水胶比、粉煤灰掺量和砂率作为考察因素,计算300次冻融循环后混凝土试件的抗折强度损失率和质量损失率,并进行极差和方差分析。研究结果表明:水胶比对高性能混凝土抗冻性有显著的影响,而粉煤灰掺量和砂率均无显著影响;冻融循环试验后的质量损失率不能准确地描述混凝土的抗冻性,而抗折强度对冻融循环试验比较敏感,建议采用抗折强度损失率作为高性能混凝土抗冻性的评价指标。

Taking water to binder ratio, fly ash percentage and sand ratio as mix-designed parameters, the influences of the parameters on the frost thaw resistance of high performance concrete（HPC） were studied with orthogonal experiments, the loss rates of bending strength and quality were calculated after 300 cycles of rapid freeze-thaw test, and their maximum difference binder ratio and variance were evaluated. The result shows that water to binder ratio has great influence on the frost thaw resistance of HPC, while fly ash percentage and sand ratio have little influence on the frost thaw resistance; the loss rate of bending strength is more sensible to freezethaw test than the loss rate of quality, so it should be used as the evaluation index of HPC. 7 tabs, 6 figs, 11 refs.