Thermodynamic modeling of the essential physicochemical interactions between the pore solution and the cement hydrates in chloride-contaminated cement-based materials

Bingbing Guo; Yi Hong; Guofu Qiao; Jinping Ou; Zuohua Li

doi:10.1016/j.jcis.2018.07.005

Thermodynamic modeling of the essential physicochemical interactions between the pore solution and the cement hydrates in chloride-contaminated cement-based materials

J Colloid Interface Sci. 2018 Dec 1:531:56-63. doi: 10.1016/j.jcis.2018.07.005. Epub 2018 Jul 3.

Authors

Bingbing Guo¹, Yi Hong², Guofu Qiao³, Jinping Ou⁴, Zuohua Li⁵

Affiliations

¹ Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China; Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China; School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China.
² Centre for Composite Material and Structure, Harbin Institute of Technology, Harbin 150090, China. Electronic address: hongyi@hit.edu.cn.
³ Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China; Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China; School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: qgf_forever@hit.edu.cn.
⁴ Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China; Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China; School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: oujinping@hit.edu.cn.
⁵ School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China. Electronic address: lizuohua@hit.edu.cn.

PMID: 30025328
DOI: 10.1016/j.jcis.2018.07.005

Abstract

The chloride transport properties of cement-based materials are determined via the physicochemical interactions between the pore solution and the cement hydrates. Herein, a thermodynamic model based on surface complexation reactions and dissolution/precipitation reactions was established to investigate the essential physicochemical interactions. The effects of chloride concentration, temperature, and saturation degree (the ratio of water volume to pore volume) on the physicochemical interactions were studied in detail using the resulting thermodynamic model. The published experimental results indicate that the resulting thermodynamic model accurately reflects the adsorption capacity of cement hydrates for chloride ions. Thus, this thermodynamic model can be coupled to the transport equations to achieve the durable designs for new reinforced concrete structures (RCSs) or to predict the service life of existing RCSs. It can also optimize corrosion control strategies for RCSs based on the thermodynamics and kinetics of the material.

Keywords: Cement-based materials; Chloride adsorption; Physicochemical interactions; Thermodynamic modeling.