CAJ | 학술논문

将Debye-Hückel理论和Onsager电导理论用于研究混凝土孔溶液中离子的扩散规律.首先,建立了饱和混凝土中离子扩散系数的计算模型,该模型考虑了离子的种类、孔溶液中离子的浓度、环境温度等因素对离子扩散系数的影响.其次,以孔溶液中氯化钠的浓度变化为例分析了离子氛半径、松弛效应、电泳效应等对孔溶液中氯离子扩散系数的影响规律,发现氯离子的扩散系数随氯化钠溶液浓度的增加而减小,离子氛半径和电泳效应是影响氯离子扩散性能的重要参数.最后,通过RCM法测定了不同水灰比混凝土的氯离子扩散系数,并将模型的计算结果与实测结果进行了对比,以验证模型的合理性,结果表明所建立的模型与实测结果较为符合.
장Debye-Hückel이론화Onsager전도이론용우연구혼응토공용액중리자적확산규률.수선,건립료포화혼응토중리자확산계수적계산모형,해모형고필료리자적충류、공용액중리자적농도、배경온도등인소대리자확산계수적영향.기차,이공용액중록화납적농도변화위례분석료리자분반경、송이효응、전영효응등대공용액중록리자확산계수적영향규률,발현록리자적확산계수수록화납용액농도적증가이감소,리자분반경화전영효응시영향록리자확산성능적중요삼수.최후,통과RCM법측정료불동수회비혼응토적록리자확산계수,병장모형적계산결과여실측결과진행료대비,이험증모형적합이성,결과표명소건립적모형여실측결과교위부합.
This paper applies the Debye-Hückel-Onsager electrolyte solution theory to investigate the diffusivity of ions in concrete pore solutions.First,a model of the diffusion coefficient associated with the ionic species,solution concentration and ambient temperature is proposed in the saturated concrete.Secondly,as an example,the effects of sodium chloride solution concentration, which are associated with influencing factors such as the ionic cloud radius,electrophoresis and relaxation,on the chloride diffusion coefficient are analyzed. It is found that the diffusion coefficient decreases with the increase in solution concentration, and the electrophoresis and ionic cloud radius are two important factors influencing the ionic diffusivity. Finally, the experiments, in which the chloride diffusion coefficients in specimens under different water-cement ratios are measured by the rapid chloride migration (RCM) method, are carded out to validate the effectiveness of the proposed model, and the results indicate that there is a generally reasonable agreement between the experimental and the proposed model results.