中文摘要：

采用快速冻融试验方法，对普通混凝土及3．5％NaCl溶液中浸泡后的混凝土试件分别进行0，25，50，75，100次冻融循环试验，并采用大型混凝土静、动三轴试验系统，检测了冻融循环对混凝土抗压强度、弹性模量及应力-应变关系的影响，建立了简明的数学表达式。利用电子显微镜观察混凝土承受不同冻融循环次数后的微观结构，发现冻融循环次数越大，水泥浆的裂缝越多：不同配比的混凝土受冻融循环的影响也不同，水灰比大的混凝土受冻融循环影响大于水灰比小的混凝土。

英文摘要：

The common concrete and the concrete dipped in 3.5% sodium chloride solution imitating seawater are subjected to freezing and thawing tests of 0, 25, 50, 75 and 100 times, respectively. The effects of the freezing and thawing cycles on compressive strength, module of elasticity and stress-strain relation of concrete are investigated and the relevant simple formulae are established. A research on microstructure of concrete under various freezing and thawing cycles proved that with the increase of cycles, there will be more cracks in cement slurry, and concretes of various water ratios are affected differently by freezing and thawing cycles.