| 引用本文: | 施惠生,王琼.混凝土中氯离子迁移的影响因素研究[J].建筑材料学报,2004,(3):286-290 |
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| 混凝土中氯离子迁移的影响因素研究 |
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施惠生,王琼
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| 摘要: |
| 从混凝土暴露时间、胶凝材料吸附作用、环境温度、应力和裂缝状态等方面考察了它们对混凝土中氯离子迁移的影响、结果表明，混凝土的氯离子表观扩散系数随暴露时间的推移而衰减，且掺有掺合料的混凝土其衰减程度要大于纯水泥混凝土；矿物掺合料对氯离子的吸附结合能力要比水泥强，胶凝材料对氯离子的吸附结合能力与环境中的氯离子浓度有关；环境温度越高，混凝土中氯离子的迁移速率越大．混凝土所处的应力状态将在多方面影响氯离子在混凝土中的迁移，混凝土中裂缝的存在将促进氯离子在混凝土中的迁移． |
| 关键词: 水泥混凝土 氯离子 裂缝 胶凝材料 矿物掺合料 应力状态 纯水 研究 迁移 吸附作用 |
| DOI： |
| 分类号:TU528 TU375 |
| 基金项目:上海市重点学科建设项目，国家重点基础研究发展规划(973)项目(2001CB610705) |
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| Research on the Factors Influencing on the Chloride Ingression in Concrete |
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SHI Hui-sheng WANG Qiong
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| Abstract: |
| The chloride ingression in concrete was investigated from some factors, such as exposure time, chloride binding, surrounding temperature, stress and crack condition. The results show that the apparent diffusion coefficient D_a of chloride in croncrete is attenuated with the prolong of exposure time in corrosion environment, and the attenuation degree of D_a is affected by mineral additions. It is larger for concrete added mineral additions than that for concrete made with pure Portland cement. The ability of binding chloride for mineral additions is larger than that for Portland cement. The speed of ingression of chloride in concrete increases with the increase of surrounding temperature. And the stress and crack condition can also affect the chloride ingression in concrete. The cracks will promote the chloride ingression in concrete. |
| Key words: concrete,chloride ion,corrosion,ingression,cementitious materials,service life |
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