复合盐蚀环境下喷射混凝土离子分布规律及氯离子扩散系数

发布时间：2018-06-06 14:01

本文选题：喷射混凝土 + 复合盐　；参考：《硅酸盐通报》2017年06期

【摘要】：通过分析(干湿循环+复合盐侵蚀)共同作用下普通混凝土、普通喷射混凝土和钢纤维喷射混凝土孔隙液中pH值、Cl~-、SO_4~(2-)和Ca~(2+)分布情况,研究了喷射混凝土离子分布规律和氯离子扩散系数。结果表明:各混凝土pH值和Ca~(2+)浓度随深度分布规律相似,均为表层最低并随深度增加而升高,且在同一深度随龄期增加而降低;普通混凝土表层Cl-浓度最高且扩散深度最大,钢纤维喷射混凝土的表层Cl-浓度最低和扩散深度最小;SO_4~(2-)在各混凝土内部的分布大致分为富集区、过渡区和稳定区三段;表面自由Cl-含量Cs为普通混凝土普通喷射混凝土钢纤维喷射混凝土,且随侵蚀龄期的增长而逐渐上升;混凝土的Cl-扩散系数D随侵蚀龄期的增长而降低,符合幂函数变化规律。
[Abstract]:The distribution of common concrete, ordinary shotcrete and steel fiber shotcrete pore fluid under the combined action of dry and wet cycle salt is analyzed. The ion distribution and chloride diffusion coefficient of shotcrete were studied. The results show that the distribution of pH value and Ca~(2 concentration in concrete is similar with the depth, which is the lowest in the surface layer and increases with the increase of the depth, and decreases with the increase of age at the same depth, and the Cl-concentration in the surface layer of ordinary concrete is the highest and the diffusion depth is the largest in the surface layer. The distribution of surface Cl-concentration and diffusion depth of steel fiber sprayed concrete is divided into three sections: rich area, transition zone and stable zone. The free Cl-content Cs on the surface of ordinary concrete sprayed concrete is steel fiber sprayed concrete, which increases gradually with the increase of erosion age, and the Cl-diffusion coefficient D of concrete decreases with the increase of erosion age, which accords with the law of power function change.
【作者单位】：西安建筑科技大学土木工程学院;西部绿色建筑重点实验室协同创新中心;结构工程与抗震教育部重点实验室;
【基金】：国家自然科学基金(51278403) 教育部创新团队发展计划(IRT13089)
【分类号】：TU528.53

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