| 干湿循环作用下混凝土硫酸盐侵蚀劣化机理试验研究 |
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| 引用本文： | 高润东,赵顺波,李庆斌,陈记豪.干湿循环作用下混凝土硫酸盐侵蚀劣化机理试验研究[J].土木工程学报,2010(2). |
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| 作者姓名： | 高润东 赵顺波 李庆斌 陈记豪 |
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| 作者单位： | 清华大学水沙科学与水利水电工程国家重点实验室;华北水利水电学院; |
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| 基金项目： | 国家自然科学基金(90715041); 河南省杰出青年科学基金(04120002300) |
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| 摘 要： | 通过微观和宏观观测综合研究不同配比混凝土在干湿循环作用下受硫酸盐侵蚀的劣化规律,设计4个W/C:0.57、0.44、0.35、0.28,对应从普通强度到高强混凝土。微观观测包括用热分析方法进行侵蚀产物分析和用改进硫酸钡重量法(化学滴定法)测量由表及里不同深度处硫酸根含量,宏观观测主要包括抗压强度、劈裂抗拉强度等基本力学性能。试验结果表明:干湿循环作用下,湿状态下混凝土受到钙矾石、石膏等膨胀性侵蚀产物的作用,干状态下又叠加由蒸发作用引起的盐结晶压力的损伤;与普通强度混凝土相比,高强混凝土的W/C小并掺有适量的减水剂,孔隙结构得到优化,使得湿状态下硫酸根传输受阻,干状态下结晶条件遭到一定程度破坏,导致混凝土受侵层厚度明显降低,表现为宏观上的强度劣化程度较轻,表明高强混凝土具有较强的抵抗硫酸盐侵蚀能力。
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| 关 键 词： | 混凝土 硫酸盐 干湿循环 侵蚀产物 结晶压力 硫酸根含量 强度劣化 |
Experimental study of the deterioration mechanism of concrete under sulfate attack in wet-dry cycles |
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| Gao Rundong Zhao Shunbo Li Qingbin Chen Jihao.Experimental study of the deterioration mechanism of concrete under sulfate attack in wet-dry cycles[J].China Civil Engineering Journal,2010(2). |
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| Authors: | Gao Rundong Zhao Shunbo Li Qingbin Chen Jihao |
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| Affiliation: | Gao Rundong1 Zhao Shunbo2 Li Qingbin1 Chen Jihao2(1. State Key Laboratory of Hydroscience , Engineering,Tsinghua University,Beijing 100084,China,2. North China University of Water Conservancy , Electric Power,Zhengzhou 450011,China) |
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| Abstract: | The deterioration mechanisms of different mix concretes under sulfate attack in wet-dry cycles were investigated through micro-and macro-observations. Four W/C ratios,0.57,0.44,0.35 and 0.28,were employed,corresponding to ordinary to high strength concrete. Micro-observations included analysis of the products using thermal analysis and determination of the sulfate-ion content profile using the modified barium sulfate gravimetric method (chemical titration method). Macro-observations mainly included the mech... |
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| Keywords: | concrete sulfate wet-dry cycles attack product crystallization pressure sulfate-ion content strength degradation |
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