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采用快速冻融方法,对处于模仿海水的3.5%Nacl溶液中的混凝土进行0、25、50、75次冻融循环,利用大型混凝土静、动三轴试验系统,进行了4种定侧应力等级的非比例加载下的双轴压试验,系统地探讨了有侧应力作用时,混凝土受腐蚀冻融循环后的双轴受压强度和变形特性等力学性能。在此基础上,建立了以八面体应力空间表示的腐蚀冻融循环后的混凝土在非比例加载下的双轴受压破坏准则。
The rapid freezing and thawing method was used to carry out 0, 25, 50, 75 freeze-thaw cycles on the concrete in 3.5% Nacl solution imitating seawater. Four types of constant stress level Biaxial compression test under non-proportional loading was carried out. The mechanical properties such as biaxial compression strength and deformation properties of the concrete subjected to corrosion and freeze-thaw cycles were investigated systematically. On this basis, the failure criterion of biaxial compression under non-proportional loading of concrete after the freeze-thaw cycle was established based on the octahedral stress space.