A model for predicting the relative chloride diffusion coefficient in unsaturated cementitious materials. (January 2019)

• Record Type: Journal Article
• Authors: Zhang, Yong; Ye, Guang
• Is Part Of: Cement and concrete research. Volume 115(2019)
• Page Start: 133
• Page End: 144
• Publication Date: 2019-01
• Subjects: Modeling -- Chloride diffusion -- Degree of water saturation -- Pore structure -- Cementitious material; Cement -- Periodicals; Cement -- Research -- Periodicals; Concrete -- Periodicals; Concrete -- Research -- Periodicals; Ciment -- Périodiques; Béton -- Périodiques; Cement; Concrete; Periodicals; 620.135
• DOI: 10.1016/j.cemconres.2018.10.013
• Languages: English
• ISSNs: 0008-8846

Abstract

Abstract: An analytical model for predicting the relative chloride diffusion coefficient in cementitious materials at different degrees of water saturation is presented in this paper. The model is developed based on the Nernst-Einstein equation and conductivity of cementitious electrolyte, as well as on moisture distribution in the pore structure. Good agreement is found between the model and the experimental data. With the help of the model, the chloride diffusion coefficient of cementitious material at unsaturated state can be determined according to the chloride diffusion coefficient at saturated state, the degree of water saturation and the average pore diameter of the material. A detailed discussion about the inputs and outputs of the model is given in order to facilitate its application for engineering practice.