混凝土抗水冻融和抗盐冻融循环作用的相关性  

Correlation between Water Freeze-Thaw Resistance and Salt Freeze-Thaw Resistance of Concrete

作　　者：徐港[1,2] 龚朝 刘俊 高德军[1,2] 曾臻 XU Gang;GONG Chao;LIU Jun;GAO Dejun;ZENG Zhen(Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China;College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China)

机构地区：[1]三峡大学防灾减灾湖北省重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《建筑材料学报》2020年第3期552-556,562,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51379111);国家重点研发计划(2017YFC501104)。

摘　　要：以相对动弹性模量作为冻融损伤的评价指标,对比分析了人工砂混凝土试件在水和质量分数为3.5%的NaCl溶液2种冻融循环下的损伤程度,研究了混凝土抗水冻融与抗盐冻融循环作用之间的相关性,并基于渗透压理论,对其相关性进行了理论阐释.结果表明:抗水冻融和抗盐冻融循环次数之间具有线性相关性,且该线性相关性与混凝土的强度等级及石粉含量无关;进一步结合天然砂混凝土抗水冻融与抗盐冻融试验数据的分析,验证了该定量关系的普适性,即混凝土抗水冻融循环次数约为其抗盐冻融循环次数的2.8倍.Taking the relative dynamic elastic modulus as the evaluation index of freeze-thaw damage,the damage degree of artificial sand concrete specimens under two freeze-thaw cycles of water and NaCl solution with mass fraction of 3.5%was compared and analyzed,and the correlation was theoretically explained based on the osmotic pressure theory.The results show that there is a linear correlation between the cycles of water freeze-thaw resistance and salt freeze-thaw resistance,and the linear correlation has nothing to do with concrete mix proportion,strength grade and stone powder content.Further combined with the analysis of the data of the water sand freeze-thaw resistance and salt freeze-thaw resistance of natural sand concrete,the universality of this quantitative relationship is verified,that is,the water freeze-thaw resistance of concrete is about 2.8 times its salt freeze-thaw resistance.

关 键 词：混凝土 抗冻性 盐冻融循环 耐久性 

分 类 号：TU528.01[建筑科学—建筑技术科学]