混凝土中冻融循环和氯离子侵蚀的耦合效应试验研究

研究了不同水灰比与骨料体积含量的混凝土在氯离子侵蚀、冻融循环与氯离子侵蚀复合条件下的相对动弹性模量、耐久性指数、混凝土外观质量与开裂情况.试验结果表明:冻融循环促进了氯离子在混凝土中的渗透、扩散,使混凝土中的氯离子含量增加,而水灰比大、骨料体积含量小的混凝土受此影响较大,冻融循环与氯离子侵蚀之间存在耦合叠加效应,这对于北方寒冷地区存在氯离子侵蚀环境的钢筋混凝土结构提供了试验和理论参考.

Experiment study on the coupled effect of freezing-thawing and chloride penetration in concrete

The interaction between freeing-thawing and chloride penetration was experimented.Two sets of specimens consideing different wa- ter-cement ratios and different aggregate volume fractions were tested.The test results show that freeing-thawing can accelerate the chloride diffu- sion and penetration and increase chloride ion degree in concrete.The concrete with larger water-cement ratio and lower aggregate volume frac- tions was much more influenced by freeing-thawing and chloride penetration.The coupled effe...