混凝土电化学脱盐模拟及其影响因素分析

电化学方法可以用来对含有氯离子的混凝土进行脱盐.电流密度的大小和环境温度的高低是影响电化学脱盐效率的主要因素,过大的电流密度会对钢筋混凝土的性能产生一定影响,而较低的温度会降低脱盐效率.基于氯离子输运方程和温度对氯离子扩散系数的影响,建立了氯离子输运数值模型,得到了不同工作电流密度和温度下混凝土的电化学脱盐效率.结果 ...

Numerical modeling of concrete electrochemical chloride extraction and analysis of its influencing factors

Electrochemical methods can be used to extract chloride from concrete containing chloride ions. Electricity currents and temperature are the main factors influencing the electrochemical chloride extraction process. Excessive currents density has an effect on the performance and integrity of the steel reinforced concrete, while lower temperatures reduce chloride extraction efficiency. The influence of chloride ion transport equation and temperature on chloride ion permeability coefficient is studied in this paper. Then a finite element model of chloride ion transport was established to analyze the electrochemical chloride extraction efficiency of concrete under different currents and temperatures. The results show that the temperature has a significant impact on the chloride extraction effect, and the chloride ion permeability coefficient at the higher temperature (303.15 K) is 8.8 times of that at the lower temperature (273.15 K). As the temperature increases, the currents required to achieve the same chloride extraction effect becomes smaller, i.e. similar chloride extraction efficiency can be achieved with lower currents in a higher temperature environment.