混凝土内源氯离子固化的研究进展

摘要/Abstract

摘要： 海洋工程建设中,海砂、珊瑚砂等原料中富含一定的氯盐,在配制过程中,原料中的氯离子进入钢筋混凝土引起内部侵蚀,导致钢筋混凝土结构失效。大量试验表明,水泥水化产物C-S-H凝胶和Friedel's盐在提高水泥基材料内源氯离子固化能力、降低钢筋锈蚀风险等方面发挥着重要作用。水泥矿物、掺合料、外加剂、类AFm相材料的存在影响着C-S-H凝胶和Friedel's盐的生成,进而改变水泥基材料的氯离子固化能力。本文综述了上述影响下C-S-H凝胶和Friedel's盐的变化,进而分析了水泥混凝土中内源氯离子的固化效果,为采用氯离子固化材料解决钢筋混凝土氯离子侵蚀问题提供参考。

关键词: 氯离子固化, C-S-H凝胶, Friedel's盐, 水泥矿物, 矿物掺合料, 化学外加剂, 水滑石

Abstract: In the construction of marine engineering, raw materials such as sea sand and coral sand are rich in certain chloride salts. During the preparation process, chloride ion in raw materials enters the interior of reinforced concrete, causing internal erosion and leading to the failure of reinforced concrete structures. A large number of experiments show that the cement hydration products C-S-H gel and Friedel's salt play an important role in improving endogenous chloride ion binding capacity of cement-based materials and reducing the risk of rebar corrosion. The presence of cement minerals, admixtures and AFm-like phase materials affect the formation of C-S-H gel and Friedel's salt, which in turn changes the chloride ion binding capacity of cement-based materials. This article reviews the changes of C-S-H gel and Friedel's salt under the above influences, and then analyzes the endogenous chloride ion binding effect in cement concrete, which provides a reference for the use of chloride ion binding materials to solve the problem of chloride ion erosion in reinforced concrete.

Key words: chloride ion binding, C-S-H gel, Friedel's salt, cement mineral, mineral admixture, chemical admixture, hydrotalcite

中图分类号:

TU528

梁文杰, 谭洪波, 吕周岭. 混凝土内源氯离子固化的研究进展[J]. 硅酸盐通报, 2023, 42(8): 2667-2682.

LIANG Wenjie, TAN Hongbo, LYU Zhouling. Research Progress on Endogenous Chloride Ion Binding of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2667-2682.

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