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Developing a model for chloride transport through concrete considering the key factors AITranslate

Libing Jin; Hualong Yu; Zhen Wang; Zhenqing Wang; Tai Fan
Henan University of Technology; Henan University of Technology; Henan University of Technology; Henan University of Technology; Henan University of Technology
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Publisher: Elsevier
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Abstract AITranslate

The corrosion of chloride-induced on concrete is affected by many factors. In this research, an innovative empirical model was developed to predict the long-term chloride migration behavior in concrete, considering the effects of water-cement ratio, time, bonding effect, temperature, relative humidity, and concrete deterioration. The reliability and validity of the results evaluated by the empirical prediction model were verified by the chloride concentration data in concrete specimens exposed to the marine environment for 3, 5, and 10 years reported in the literature. Combined with the established empirical prediction model, the concrete model was regarded as a three-phase composite material composed of mortar, coarse aggregate, and interfacial transition zone. The effects of key factors on chloride migration were further analyzed by using the mesoscopic finite element numerical simulation method. It was observed that when temperature increases from 5 ℃ to 65 ℃, chloride diffusion depth rises by 3.3 times. When relative humidity increases from 20% to 100%, chloride diffusion depth rises by 4.3 times. Also, the water-cement ratio, concrete deterioration, and chloride binding effect have a non-negligible impact on chloride migration.

KeyWords AITranslate

C chloride content chloride content C0 initial chloride concentration initial chloride concentration Cb bounding chloride content bounding chloride content Cf free chloride content free chloride content Cs surface chloride concentration surface chloride concentration Ct total chloride content total chloride content D chloride diffusivity chloride diffusivity D28 chloride ion diffusivity at a curing age of 28 days chloride ion diffusivity at a curing age of 28 days fK effect parameter of concrete degradation on chloride diffusion effect parameter of concrete degradation on chloride diffusion ft effect parameter of time on chloride migration effect parameter of time on chloride migration G ideal gas constant ideal gas constant m time decay factor time decay factor R relation parameter between free and bound chloride relation parameter between free and bound chloride RH relative humidity relative humidity RHc critical relative humidity critical relative humidity t diffusion time diffusion time t0 reference time reference time U activation energy in diffusion process activation energy in diffusion process w/c watercement ratio watercement ratio we relation parameter between the volume of evaporable pore water and concrete volume relation parameter between the volume of evaporable pore water and concrete volume x depth from the concrete surface depth from the concrete surface α chloride ion linear binding coefficient chloride ion linear binding coefficient Concrete Chloride diffusion Multiple factors Transport model Numerical analysis
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Basic Information:

DOI：https://doi.org/10.1016/j.cscm.2022.e01168

Chinese Library Classification Number:

Citation Information:

The corrosion of chloride-induced on concrete is affected by many factors. In this research, an innovative empirical model was developed to predict the long-term chloride migration behavior in concrete, considering the effects of water-cement ratio, time, bonding effect, temperature, relative humidity, and concrete deterioration. The reliability and validity of the results evaluated by the empirical prediction model were verified by the chloride concentration data in concrete specimens exposed to the marine environment for 3, 5, and 10 years reported in the literature. Combined with the established empirical prediction model, the concrete model was regarded as a three-phase composite material composed of mortar, coarse aggregate, and interfacial transition zone. The effects of key factors on chloride migration were further analyzed by using the mesoscopic finite element numerical simulation method. It was observed that when temperature increases from 5 ℃ to 65 ℃, chloride diffusion depth rises by 3.3 times. When relative humidity increases from 20% to 100%, chloride diffusion depth rises by 4.3 times. Also, the water-cement ratio, concrete deterioration, and chloride binding effect have a non-negligible impact on chloride migration.

quote

GB/T 7714-2015 [1] Libing Jin, Hualong Yu, Zhen Wang, et al. Case Studies in Construction Materials, 2022(17). DOI:10.1016/j.cscm.2022.e01168.
MLA [1] Libing Jin, et al., Case Studies in Construction Materials, no. 17, 2022, https://doi.org/10.1016/j.cscm.2022.e01168.
APA [1] Libing Jin, Hualong Yu, Zhen Wang, Zhenqing Wang, & Tai Fan. (2022). Case Studies in Construction Materials(17). https://doi.org/10.1016/j.cscm.2022.e01168
IEEE [1] Libing Jin, Hualong Yu, Zhen Wang, Zhenqing Wang, and Tai Fan, Case Studies in Construction Materials, no. 17, 2022, doi: 10.1016/j.cscm.2022.e01168. keywords: {C chloride content;chloride content;C0 initial chloride concentration;initial chloride concentration;Cb bounding chloride content;bounding chloride content;Cf free chloride content;free chloride content;Cs surface chloride concentration;surface chloride concentration;Ct total chloride content;total chloride content;D chloride diffusivity;chloride diffusivity;D28 chloride ion diffusivity at a curing age of 28 days;chloride ion diffusivity at a curing age of 28 days;fK effect parameter of concrete degradation on chloride diffusion;effect parameter of concrete degradation on chloride diffusion;ft effect parameter of time on chloride migration;effect parameter of time on chloride migration;G ideal gas constant;ideal gas constant;m time decay factor;time decay factor;R relation parameter between free and bound chloride;relation parameter between free and bound chloride;RH relative humidity;relative humidity;RHc critical relative humidity;critical relative humidity;t diffusion time;diffusion time;t0 reference time;reference time;U activation energy in diffusion process;activation energy in diffusion process;w/c watercement ratio;watercement ratio;we relation parameter between the volume of evaporable pore water and concrete volume;relation parameter between the volume of evaporable pore water and concrete volume;x depth from the concrete surface;depth from the concrete surface;α chloride ion linear binding coefficient;chloride ion linear binding coefficient;Concrete;Chloride diffusion;Multiple factors;Transport model;Numerical analysis}