Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

Marine atmosphere environment accelerates the process of chloride penetration into concrete under the coupling effect of ambient temperature and relative humidity, thereby reducing the durability and service life of concrete. This paper aims to investigate the change of water equilibrium saturation...

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Autores principales:	Qingzhang Zhang, Feng Wang, Yifeng Ling, Hui Chen, Zhongyuan Li
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/9809ed0bda4e463fa6c7a743fbba7c37
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spelling	oai:doaj.org-article:9809ed0bda4e463fa6c7a743fbba7c372021-11-29T00:55:27ZInvestigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete1687-844210.1155/2021/7548071https://doaj.org/article/9809ed0bda4e463fa6c7a743fbba7c372021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/7548071https://doaj.org/toc/1687-8442Marine atmosphere environment accelerates the process of chloride penetration into concrete under the coupling effect of ambient temperature and relative humidity, thereby reducing the durability and service life of concrete. This paper aims to investigate the change of water equilibrium saturation and the chloride transport properties of concrete materials in different environments. The water equilibrium saturation tests at three temperatures and five relative humidity (RH) and salt spray erosion tests at three temperatures were performed. The influence of RH and temperature on the equilibrium saturation of concrete and the influence of temperature and time on the chloride diffusion coefficient are investigated. The results show that, in the process of moisture absorption and desorption, the equilibrium saturation of concrete gradually decreases as temperature rises. At the same depth of concrete, the chloride content gradually increases with temperature increasing, as well as the chloride diffusion coefficient. However, as the corrosion time of salt spray increases, the altering of chloride diffusion coefficient becomes less. Based on the Kelvin equation, a relationship between capillary pressure and water saturation in concrete was established, and a moisture transfer model for concrete in the process of moisture absorption and desorption was derived. Further, based on the established chloride diffusion equation and heat balance equation, a model of temperature-wet-chloride coupling chloride transfer was derived. Theory model simulation results show the transfer speed of chloride under the coupling of diffusion and capillary is higher than pure diffusion in moisture in the absorption process. However, the opposite is true in the desorption process. Moreover, with the increment of saturation rate, the capillary effect on chloride transport is enhanced.Qingzhang ZhangFeng WangYifeng LingHui ChenZhongyuan LiHindawi LimitedarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENAdvances in Materials Science and Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Qingzhang Zhang Feng Wang Yifeng Ling Hui Chen Zhongyuan Li Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete
description	Marine atmosphere environment accelerates the process of chloride penetration into concrete under the coupling effect of ambient temperature and relative humidity, thereby reducing the durability and service life of concrete. This paper aims to investigate the change of water equilibrium saturation and the chloride transport properties of concrete materials in different environments. The water equilibrium saturation tests at three temperatures and five relative humidity (RH) and salt spray erosion tests at three temperatures were performed. The influence of RH and temperature on the equilibrium saturation of concrete and the influence of temperature and time on the chloride diffusion coefficient are investigated. The results show that, in the process of moisture absorption and desorption, the equilibrium saturation of concrete gradually decreases as temperature rises. At the same depth of concrete, the chloride content gradually increases with temperature increasing, as well as the chloride diffusion coefficient. However, as the corrosion time of salt spray increases, the altering of chloride diffusion coefficient becomes less. Based on the Kelvin equation, a relationship between capillary pressure and water saturation in concrete was established, and a moisture transfer model for concrete in the process of moisture absorption and desorption was derived. Further, based on the established chloride diffusion equation and heat balance equation, a model of temperature-wet-chloride coupling chloride transfer was derived. Theory model simulation results show the transfer speed of chloride under the coupling of diffusion and capillary is higher than pure diffusion in moisture in the absorption process. However, the opposite is true in the desorption process. Moreover, with the increment of saturation rate, the capillary effect on chloride transport is enhanced.
format	article
author	Qingzhang Zhang Feng Wang Yifeng Ling Hui Chen Zhongyuan Li
author_facet	Qingzhang Zhang Feng Wang Yifeng Ling Hui Chen Zhongyuan Li
author_sort	Qingzhang Zhang
title	Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete
title_short	Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete
title_full	Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete
title_fullStr	Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete
title_full_unstemmed	Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete
title_sort	investigation on numerical simulation of chloride transport in unsaturated concrete
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/9809ed0bda4e463fa6c7a743fbba7c37
work_keys_str_mv	AT qingzhangzhang investigationonnumericalsimulationofchloridetransportinunsaturatedconcrete AT fengwang investigationonnumericalsimulationofchloridetransportinunsaturatedconcrete AT yifengling investigationonnumericalsimulationofchloridetransportinunsaturatedconcrete AT huichen investigationonnumericalsimulationofchloridetransportinunsaturatedconcrete AT zhongyuanli investigationonnumericalsimulationofchloridetransportinunsaturatedconcrete
_version_	1718407785335488512

Investigation on Numerical Simulation of Chloride Transport in Unsaturated Concrete

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