| 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. |
| 关键词: 混凝土 抗冻性 盐冻融循环 耐久性 |
| DOI：10.3969/j.issn.1007 9629.2020.03.010 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51379111），国家重点研发计划（2017YFC501104） |
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| Correlation between Water Freeze Thaw Resistance andSalt Freeze Thaw Resistance of Concrete |
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XU Gang, GONG Chao, LIU Jun, GAO Dejun, ZENG Zhen
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Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China
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| Abstract: |
| 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. |
| Key words: concrete frost resistance salt freeze thaw cycle durability |
