电化学方法萃取砂浆中氯离子的试验研究

Experimental Study on Electrochemical Chloride Extraction from Mortar

采用正交设计的试验方法,以萃取效率、粘结强度损失为考核指标,选择电流密度、原始氯离子含量、电解液种类及萃取时间作为影响因素,综合分析了各因素的影响规律.研究表明:电流密度是影响萃取效率的最主要的因素,其次是萃取时间.提高电流密度加快了氯离子迁移的速度,而延长萃取时间可增加氯离子的萃取量.对萃取效率影响大的因素对钢筋粘结强度损失的影响也大.增大电流密度,延长萃取时间,可提高萃取效率,但也可导致较大的粘结强度损失.在实际工程中选择萃取参数的时候需要综合考虑这两方面的影响.

An orthogonal experiment was carried out to study the effects of factors such as current density, initial chloride content, type of electrolytes and extraction time on extraction efficiency and bond strength of reinforced mortar. The test results show that current density is the primary factor to affect the extraction efficiency, and the factor of extraction time the secondary. Increasing current density accelerates the removal rate of chloride, and prolonging extraction time increases the amount of chloride extraction. The factors that remarkably influence extraction efficiency also obviously affect loss of bond strength between rebar and mortar. Thus, in practice engineering, both of these two aspects are proposed to be taken into consideration when choosing extraction parameters.