冻融循环后混凝土的静动力特性试验研究

针对冻融循环后混凝土的静态力学特性已进行了广泛研究，然而其动态力学性能研究尚未见报道。首先采用快速冻融方法，对1组混凝土试件分别进行了0、40、80、120、150、180、210、240、270、300次冻融循环试验，然后利用电子万能试验机和SHPB试验装置，进行了受冻融循环作用试件的抗压性能和动态冲击性能试验，得到了混凝土抗压强度随冻融循环次数和应变率的变化规律。试验表明，冻融循环对混凝土的静态抗压强度具有显著影响，但对试验中混凝土的动态抗压强度未见明显影响。

Test study of the static and dynamic characteristics of concrete after freeze-thaw cycling

The dynamic characteristics of concrete after freeze-thaw cycling have not yet been considered till now although many researches have been made on its static characteristics. A set of concrete specimens was frozen- thawed alternatively first obeying the quick freeze-thaw test rules with the freeze-thaw cycling number of 0, 40, 80, 120, 150, 180,210,240,270 and 300 separately. Then the static and dynamic characteristics of these specimens under compression and impact were tested using an electronic universal testing machine and a split Hopkinson pres- sure bar （SHPB） device respectively. The regularities of the static compressive strength and the dynamic impact strength varying with freeze-thaw cycles and strain rate were obtained and discussed subsequently. It can be seen from the tests that the freeze-thaw action degrades the static compressive strength of the concrete remarkably while the dynamic impact strength of the concrete tested is not affected by freeze-thaw action.