基于混凝土表面氯离子浓度时变性的氯离子扩散模型研究

Model of chloride diffusion analysis considering ontime- dependent surface chloride ion concentration

通过自然扩散法研究了钢筋混凝土在硫酸盐、氯盐作用下的耐久性,测定了混凝土表面氯离子浓度,建立水灰比及硫酸根对混凝土表面氯离子浓度影响的关系,并建立基于混凝土表面氯离子浓度时变性的氯离子扩散模型,结果表明:混凝土表面氯离子浓度随着侵蚀龄期的增长逐渐趋于稳定,并且稳定后的表面氯离子浓度随着水灰比的增加而逐渐增加;硫酸盐的存在不改变表面氯离子浓度的扩散规律,但是硫酸根的存在减小了稳定后的表面氯离子浓度。

Through the normal temperaturediffusion method to study the durability of the reinforced concrete under sulfate salt and chloride salt,measured on the surface chloride ion concentration of concrete,then establish water cement ratio and sulfate ion effect on concrete surface chloride ion concentration,andestablish the model ofchloride diffusion analysis considering on time- dependent surface chloride ion concentration. The results showthat the concrete surface chloride ion concentration as the growth of the ages of erosion gradually stabilized,and stability of surface chloride ion concentration gradually increased with the increase of water cement ratio. The existence of sulfate do not change the diffusion regularity of surface chloride ion concentration,but the presence of sulfate ion reduced the stability of surface chloride ion concentration.