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氯离子结合及其对水泥基材料微观结构的影响
作者:王小刚1 史才军1 何富强2 元强3 王德辉1 黄勇1 李庆玲1 
单位:1. 湖南大学土木工程学院 长沙 410082 2. 厦门理工学院土木工程与建筑系 福建 厦门 361024 3. 中南大学土木建筑学院 长沙 410075 
关键词:氯离子结合 结合机理 微观结构 水化产物 孔结构 水泥基材料 
分类号:TQ172
出版年,卷(期):页码:2013,41(2):187-198
DOI:
摘要:

摘  要:氯离子引入水泥基材料之后,部分会同某些水泥相发生化学反应,部分被吸附在水化产物或者孔壁上,前者称为氯离子化学结合,后者称为氯离子物理吸附,它们统称为氯离子结合。化学结合主要是形成Friedel’s盐的过程,物理吸附主要是C–S–H凝胶对氯离子的作用。许多其它因素,包括辅助胶凝材料(粉煤灰、矿粉和硅灰)对氯离子结合也有显著影响。由于氯离子结合,水泥基材料的微观结构也发生了一些改变。熟知水泥基材料对氯离子的结合作用及氯离子引进水泥基材料之后微观结构的改变,可以为钢筋混凝土结构工程使用寿命设计和预测提供科学理论依据。

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Abstract: When chloride ions are introduced into cement-based materials, some of chloride ions interact with the hydration products, and some of chloride ions absorb to the hydration products or pore wall. The former is called chloride chemical binding, and the latter is called chloride physical adsorption, they are collectively referred to the chloride binding. The formation of Friedel’s salt is the main chemical binding, physical adsorption is mainly controlled by C–S–H gel. There are some other factors influencing chloride binding. Some supplementary cement materials (i.e., fly ash, slag and silica fume) also affect chloride binding notably. Due to the chloride binding, it is expected that there should be microstructural changes in cement-based materials. By knowing the chloride binding and the change of microstructure when chloride ions are introduced into cement-base materials well, we could provide a scientific basis for the service life design and prediction of reinforced concrete structures.

基金项目:
国家自然科学基金(50978093;51072050;51108396);国家“973”计划(2009CB6231001)项目资助。
作者简介:
第一作者:王小刚(1987—),男,硕士研究生。 通信作者:史才军(1963—),男,博士,教授。
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