高性能混凝土的氯离子扩散及服役寿命研究  

Study of Chloride Diffusion of High-Performance Concrete and Its Service Life by the Boundary Element Method

作　　者：陈正[1,2] 杨绿峰[1,2] 冯庆革[1] 刘鸿亮[1,2] 王燚[1,2] 

机构地区：[1]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《建筑材料学报》2010年第2期222-227,231,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50768001;50762001);广西科技开发计划项目(桂科能0992028-7);国家留学归国人员基金资助项目(教外司留2003-14;2006-331)

摘　　要：通过快速氯离子扩散试验测试了不同矿物掺和料高性能混凝土和普通混凝土的电通量,分析计算了氯离子扩散系数和钢筋锈蚀的临界氯离子浓度;利用边界元法计算了普通混凝土和高性能混凝土的服役寿命.结果表明:基于边界元法的氯离子扩散场计算长度理论及数值分析模型能很好预测混凝土的服役寿命.三掺粉煤灰、硅灰和矿渣高性能混凝土其耐久性优于单掺粉煤灰高性能混凝土,具有最佳抗氯离子扩散能力.The electric flux of high-performance concrete（HPC） with fly ash,blast furnace slag and silica fume and normal concrete（NC） were tested by using ASTM C1202,the diffusion coefficient and threshold value of chloride for the corrosion of steel bar were analyzed and calculated.Accordingly the service life of the HPC and NC was evaluated for the first time by the boundary element method（BEM）.The result shows that the theory of computing length and the model of BEM for chloride diffusion is suitable for prediction of the service life of concrete.It can be concluded that the HPC with fly ash,blast furnace slag and silica fume improve the resistance to chloride diffusion and is better than those with fly ash only.

关 键 词：混凝土 高性能 边界元 氯离子 

分 类 号：TU528.07[建筑科学—建筑技术科学]