高性能混凝土应力腐蚀影响因素显著性分析

混凝土的应力腐蚀破坏是影响其耐久性能的主要原因。利用自行设计的应力腐蚀加载试验装置，通过正交设计方法，研究了高性能混凝土在3分点加荷及腐蚀溶液耦合作用下抗折强度衰减规律，提出了应力腐蚀因子和介质腐蚀因子两项评价指标，根据方差结果分析了不同影响因素对高性能混凝土应力腐蚀试验结果的敏感性。结果表明，水胶比、粉煤灰掺量、腐蚀溶液对高性能混凝土应力腐蚀因子和介质腐蚀因子都具有显著的影响，但水胶比对其影响特别显著，而应力水平仅对应力腐蚀因子的影响具有显著性。因此，对配合比设计参数中的水胶比、外掺材料进行优化设计可有效地提高公路建设用混凝土的耐久性。

Prominent property analysis of influential factors of high performance concrete (HPC) stress corrosion

Stress corrosion damage is the main reason of influencing concrete durability performance. With the loading test equipment of stress corrosion designed specially, through orthogonality design method, the paper studied the bending strength attenuation discipline of HPC withstanding coupling action of simultaneous action of third point loading and corrosion solution, put forward two evaluation targets of stress corrosion factor and medium corrosion factor, and analyzed the sensitivity of different influential factors on stress corrosion test results according to variance results. The results indicate that water binder ratio, dosage of fly ash and corrosion solution all have prominent influence on the stress corrosion factor and medium corrosion factor of HPC in which the influence of water binder ratio is most prominent, while stress level only has prominent influence on stress corrosion factor. Therefore, the optimum design of mixture ratio design parameters of cement binder ratio and admixtures can effectively enhance the durability of concrete used in road construction. 9 tabs, 2 figs, 8 refs.