MODELLING IONIC DIFFUSIVITY WITH STRESS ACTIONS IN CONCRETE BASED ON ELECTROLYTE SOLUTION THEORY

摘要：

This paper utilizes the electrolyte solution theory and the phenomenological method to investigate the ionic diffusivity in concrete under the stress actions. A computational model of the ion diffusion coefficient,which is associated with ion species,pore solution concentration,stress,concrete mix parameters including water-cement ratio and cement volume fraction,and microstructure parameters such as the porosity and tortuosity,is proposed in the saturated concrete; Numerical simulation has been completed to investigate the effects of the ion concentration in the pore solution and the tension stress in concrete on the ion diffusion coefficients. The results show that the ion diffusion coefficient in concrete increases with the tension stress,and when the tension stress greater than 1.0MPa,the ionic diffusion coefficients in concrete increase obviously. Meanwhile,the ion concentration produces more obvious effects on the diffusivity itself,but has almost no effects on the other ions.

关键词： Diffusion coefficient Concrete Ion Model Electrolyte solution theory Stress

作者: Xiao-Bao Zuo Wei Sun

作者单位: Department of Civil Engineering,Department of Civil Engineering,Nanjing University of Science & Tech Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,P.R.China

会议类型: 国际会议

会议名称: The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)

会议地点: 广州

会议语种:英文

页码: 1245-1251

在线出版日期: 2010-12-01（万方平台首次上网日期，不代表论文的发表时间）