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为了有效评估海水冻融与侵蚀后混凝土的力学性能,基于大型静态和动态刚度伺服压力机进行了混凝土冻融和海水侵蚀后的力学性能试验.对混凝土进行了50,100,200和300次冻融循环,并配置了人工海水;选择了合理的干湿循环机制,对冻融后的混凝土试块进行了10,20,30,40,50和60次干湿循环.对混凝土弹性模量和抗压强度退化规律进行了研究.基于混凝土单轴力学性能和损伤理论,推导了考虑干湿循环次数和冻融循环次数的Ottosen三轴强度.试验研究表明:随着干湿循环和冻融循环次数增加,混凝土轴心抗压强度和弹性模量逐渐下降,强度准则的拉、压子午线逐渐收缩.该研究可为受海水侵蚀在寒冷地区的实际结构抗裂设计提供参考.
In order to effectively evaluate the mechanical properties of concrete after seawater freezing-thawing and erosion, the mechanical properties of the concrete after freeze-thaw and seawater erosion were tested based on large static and dynamic stiffness servo presses.The concrete was subjected to 50, 100, 200 and 300 cycles of freezing and thawing The artificial seawater was arranged and a reasonable wet-dry cycle mechanism was chosen to freeze-dry the concrete blocks after freeze-thaw for 10, 20, 30, 40, 50 and 60. The concrete modulus of elasticity and compressive strength degenerated Law was studied.According to the uniaxial mechanical properties and damage theory of concrete, the Ottosen triaxial strength was deduced considering the number of wet-dry cycles and the freeze-thaw cycles.The experimental results show that with the increase of the number of wet-dry cycles and freeze-thaw cycles, The compressive strength and elastic modulus of the core decrease gradually, and the tension and compression meridional shrinkage of the strength criterion shrinks gradually.This study can provide a reference for the actual structural crack resistance design of seawater erosion in cold regions.