Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels

The concrete lining in subway tunnels often undergoes cracking damage in coastal cities. The combination of cracked tunnel lining structures and high concentrations of corrosive ions in the groundwater (e.g., chlorine) can accelerate concrete erosion, reduce the mechanical performance of the lining...

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Autores principales:	Sulei Zhang, Qing Xu, Rui Ren, Jiahao Sui, Chang Liu, Changfeng Yuan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	subway tunnel chloride penetration indoor experiment numerical analysis service life prediction treatment measures Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/53ac8b293f5743379816c8825d2dd496
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spelling	oai:doaj.org-article:53ac8b293f5743379816c8825d2dd4962021-11-11T18:10:46ZChloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels10.3390/ma142166631996-1944https://doaj.org/article/53ac8b293f5743379816c8825d2dd4962021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6663https://doaj.org/toc/1996-1944The concrete lining in subway tunnels often undergoes cracking damage in coastal cities. The combination of cracked tunnel lining structures and high concentrations of corrosive ions in the groundwater (e.g., chlorine) can accelerate concrete erosion, reduce the mechanical performance of the lining structures and shorten the tunnel service life. This paper investigates the chloride ion concentration in the groundwater of several subway tunnels in the coastal city of Qingdao, China. Indoor experiments and numerical simulations are conducted to investigate the chloride ion transport behaviour and service performance of cracked concrete linings. The results are applied to predict the service life of lining structures. The crack depth in concrete linings is found to have the most significant effect on the transport rate of chloride ions, followed by the crack width. The numerical simulations are carried out using COMSOL software to study the chloride transport behaviour in cracked specimens and predict the service lifetimes of lining structures of different thicknesses, and the results correspond well with the experimental data. The durability of a concrete lining can be enhanced by increasing the thickness of the protective concrete layer. Additional measures are proposed for treating cracked concrete linings to resist chloride ion attack in subway tunnels.Sulei ZhangQing XuRui RenJiahao SuiChang LiuChangfeng YuanMDPI AGarticlesubway tunnelchloride penetrationindoor experimentnumerical analysisservice life predictiontreatment measuresTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6663, p 6663 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	subway tunnel chloride penetration indoor experiment numerical analysis service life prediction treatment measures Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	subway tunnel chloride penetration indoor experiment numerical analysis service life prediction treatment measures Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Sulei Zhang Qing Xu Rui Ren Jiahao Sui Chang Liu Changfeng Yuan Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels
description	The concrete lining in subway tunnels often undergoes cracking damage in coastal cities. The combination of cracked tunnel lining structures and high concentrations of corrosive ions in the groundwater (e.g., chlorine) can accelerate concrete erosion, reduce the mechanical performance of the lining structures and shorten the tunnel service life. This paper investigates the chloride ion concentration in the groundwater of several subway tunnels in the coastal city of Qingdao, China. Indoor experiments and numerical simulations are conducted to investigate the chloride ion transport behaviour and service performance of cracked concrete linings. The results are applied to predict the service life of lining structures. The crack depth in concrete linings is found to have the most significant effect on the transport rate of chloride ions, followed by the crack width. The numerical simulations are carried out using COMSOL software to study the chloride transport behaviour in cracked specimens and predict the service lifetimes of lining structures of different thicknesses, and the results correspond well with the experimental data. The durability of a concrete lining can be enhanced by increasing the thickness of the protective concrete layer. Additional measures are proposed for treating cracked concrete linings to resist chloride ion attack in subway tunnels.
format	article
author	Sulei Zhang Qing Xu Rui Ren Jiahao Sui Chang Liu Changfeng Yuan
author_facet	Sulei Zhang Qing Xu Rui Ren Jiahao Sui Chang Liu Changfeng Yuan
author_sort	Sulei Zhang
title	Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels
title_short	Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels
title_full	Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels
title_fullStr	Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels
title_full_unstemmed	Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels
title_sort	chloride transport behaviour and service performance of cracked concrete linings in coastal subway tunnels
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/53ac8b293f5743379816c8825d2dd496
work_keys_str_mv	AT suleizhang chloridetransportbehaviourandserviceperformanceofcrackedconcreteliningsincoastalsubwaytunnels AT qingxu chloridetransportbehaviourandserviceperformanceofcrackedconcreteliningsincoastalsubwaytunnels AT ruiren chloridetransportbehaviourandserviceperformanceofcrackedconcreteliningsincoastalsubwaytunnels AT jiahaosui chloridetransportbehaviourandserviceperformanceofcrackedconcreteliningsincoastalsubwaytunnels AT changliu chloridetransportbehaviourandserviceperformanceofcrackedconcreteliningsincoastalsubwaytunnels AT changfengyuan chloridetransportbehaviourandserviceperformanceofcrackedconcreteliningsincoastalsubwaytunnels
_version_	1718431884389646336

Chloride Transport Behaviour and Service Performance of Cracked Concrete Linings in Coastal Subway Tunnels

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