影响混凝土表面氯离子浓度的主要因素综述

Summary of Main Factors Affecting Chloride Ion Concentration on Concrete Surface

目前针对混凝土表面氯离子浓度的影响因素的研究分析表明,其主要影响因素有时间、材料及环境三个方面。暴露时间的延长,表面氯离子浓度将会增大;养护时间的延长,使得混凝土结构逐渐变密实,表面氯离子浓度随之降低。水胶比的增大,稳定后表面氯离子浓度将逐渐增大,且会更快地达到稳定状态;加入矿物掺合料之后,氯离子累计速率会明显增大,即表面氯离子浓度会更快地达到稳定状态,且稳定后的表面氯离子浓度也相应增大。暴露环境介质中的氯离子浓度越高,表面氯离子浓度也会越高;混凝土结构离海岸的距离,以及吹向混凝土结构海风的风速也会对混凝土结构表面自由氯离子浓度产生一定的影响。影响混凝土结构表面氯离子浓度的因素众多,想要确切地计算和预测出混凝土结构表面的氯离子浓度有较大的难度,目前国内外对于这方面的工作只能对其采取经验公式进行计算和预测,因此,对于氯离子浓度的计算还有待深入研究。

At present,the research and analysis on the influencing factors of the chloride ion concentration on concrete surface show that the main influencing factors are time,material and environment.With the prolonging of exposure time,the surface chloride ion concentration will increase.With the prolonging of curing time,the concrete structure will gradually become dense and the surface chloride ion concentration will decrease.With the increase of water binder ratio,the surface chloride ion concentration will gradually increase after stabilized and the stable state will reach faster.After the mineral admixtures are added,the cumulative rate of chloride ion will increase significantly,that is the surface chloride ion concentration will reach the stable state faster,and the stable surface chloride ion concentration will also increase accordingly after stabilized.The higher is the chloride ion concentration in the exposed environment medium,the higher is the surface chloride ion concentration.The distance from the concrete structure to the coast and the speed of sea wind to the concrete structure will also have a certain impact on the free chloride ion concentration on the surface of the concrete structure.There are many factors affecting the chloride ion concentration on the surface of concrete structure.It is very difficult to accurately calculate and predict the chloride ion concentration on the surface of concrete structure.At present,the empirical formula can only be used to calculate and predict the chloride ion concentration at home and abroad.Therefore,the calculation of chloride ion concentration needs to be further studied.