混凝土的酸和冻融双重腐蚀效应与破裂特征

Double corrosion effects under acid and freezing and thawing erosion and fracture behavior of concrete

为了研究混凝土在各种侵蚀环境条件下的力学特性,采用模拟试验的方法进行了混凝土在酸腐蚀和冻融循环共同作用下的破裂过程试验,采用高精度数码照相机实时观测混凝土试件的荷载破裂过程,探讨了不同pH值和冻融循环次数下混凝土的表面侵蚀特征和力学性能,对酸和冻融双重腐蚀下混凝土的破裂过程进行了分析,得到了一些有益的结果.为进一步分析复杂环境下混凝土的内部损伤演化规律和本构模型的建立奠定了基础.

Experiments of concrete fracturing process were conducted under uniaxial compression in order to investigate the behavior of concrete under corrosive environmental conditions. Fracture process of concrete is realtime observed using digital camera of high resolution. The surface erosion feature and mechanical behavior of concrete were studied under different pH values and freezing and thawing cycles. Fracture behaviors of concrete under environmental erosion were analyzed. Some beneficial conclusions were obtained.