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本文首先试验研究了荷载作用下高性能混凝土冻融循环的耐久性 ,提出了荷载作用下冻融循环断裂可靠度的概率统计方法。研究表明 :荷载作用下的破坏主要为外荷载加速冻融破坏 ,诱发动弹性模量降低和试件断裂。通过对应力作用下混凝土材料冻融失效破坏的可靠度计算 ,获得在保证一定可靠度下的冻融循环寿命
In this paper, first, the durability of high performance concrete subjected to freeze-thaw cycles is experimentally studied, and the probability and statistics method for the reliability of freeze-thaw cycles under load are proposed. The results show that the main damage under load is the accelerated freeze-thaw failure of outer load, the decrease of dynamic elastic modulus and the fracture of specimens. Through the calculation of the reliability of the concrete material under freezing and thawing failure under the action of stress, the freeze-thaw cycle life under the certain reliability is obtained