| 摘要: |
| 用RCM法和电通量法2种方法测试了高温后不同配比混凝土的抗氯离子渗透特性，比较了2种方法的测试结果，并通过SEM观测了高温前后混凝土微观结构的变化.结果表明：高温前和高温后，混凝土强度等级对氯离子渗透性均有明显影响；随着温度升高，混凝土的氯离子渗透性不断提高，特别是当温度达到800℃时有显著增加；RCM法和电通量法所测指标的变化趋势基本一致，但RCM法能更为准确地反映出高温对各配比混凝土孔隙结构的影响规律；高温前后混凝土微观结构变化与其宏观上氯离子渗透性的变化规律相符. |
| 关键词: RCM法 电通量法 高温 混凝土 微观结构 |
| DOI：103969/j.issn1007 9629201404023 |
| 分类号: |
| 基金项目:上海市应用技术开发项目（2011 114）；上海市人才发展基金资助项目（2011058）；上海自然科学基金资助项目（12ZR1426800） |
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| Experimental Research on Resistance of Concrete toChloride Penetration after High Temperature |
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GAO Rundong1, XU Qingfeng1, LI Xiangmin1, WANG Qiong2, YU Linfeng2
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1.Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai 200032, China;2.Shanghai Research Institute of Building SciencesGroup Co., Ltd., Shanghai 200032, China
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| Abstract: |
| By both test methods of rapid chloride migration（RCM） and coulomb electric flux, resistance of concrete of different mix proportion to chloride penetration after high temperature was measured. Results by two methods were compared with each other, and meanwhile concrete micro structure change before and after high temperature was also observed by SEM. Test results indicated both before and after high temperature, concrete strength has obvious effect on chloride penetration; with temperature elevated, chloride penetration is increased, which is extremely remarkable for 800℃; the main change trends of test results by both test methods of RCM and coulomb electric flux were similar, however, the former could more finely reflect the effect of high temperature on concrete pore structure; before and after high temperature, the concrete micro structure change is in accord with the degree of chloride penetration. |
| Key words: RCM coulomb electric flux high temperature concrete micro structure |
