中文摘要：

通过常温及-30℃至-120℃间冻融循环作用混凝土的试验，得到混凝土超低温冻融循环下受压强度的变化规律。结果表明，经历冻融循环作用的混凝土破坏形态基本同常温，但冻融循环上限温度时不再呈对顶棱锥状；冻融循环作用导致的混凝土受压强度恶化主要集中于初期，随冻融循环次数继续增加则影响较小；冻融循环作用上下限温度时的混凝土受压强度变化规律相似，不同冻融循环工况下混凝土受压强度在冻融循环开始时相似，但随后有所不同。

英文摘要：

Compressive strength of concrete undergoing cryogenic freeze-thaw cycles were tested and discussed, the freeze-thaw cycles were conducted by two ranges of temperature. Both with a lower limit tem- perature of - 120 ℃ , condition one has a upper limit temperature of -30 ℃ , and condition two has a upper limit temperature of 20℃. The result shows that, the failure mode of concrete would not change much after the thermal load, but for pyramids would not come out from both ends of specimen loaded at upper limit temperature. And the damage of the thermal loading is serious at first but reduces after several cycles. The laws of strength change at upper or lower limit of temperature are alike, and the laws for the two conditions of cycles are similar at the beginning, but differ when the thermal loading goes on.