Staff View: Influence of sodium aluminate on calcium leaching of shotcrete in tunnels

Influence of sodium aluminate on calcium leaching of shotcrete in tunnels

Road tunnels built in water-rich areas are prone to calcium leaching owing to long-term erosion by groundwater, which results in calcite deposition in tunnel drainage system. Calcite deposition can lead to the clogging of drainage pipes and water gutters. When these facilities are blocked, the groun...

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Main Authors:	Ye, Fei, He, Biao, Tian, Chong-ming, Zhao, Meng, Wang, Jian, Han, Xing-bo, Armaghani, Danial Jahed
Format:	Article
Published:	Pergamon-Elsevier Science Ltd 2021
Subjects:	TA Engineering (General). Civil engineering (General) TH Building construction
Online Access:	http://eprints.um.edu.my/28681/
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spelling	my.um.eprints.286812022-04-20T08:04:10Z http://eprints.um.edu.my/28681/ Influence of sodium aluminate on calcium leaching of shotcrete in tunnels Ye, Fei He, Biao Tian, Chong-ming Zhao, Meng Wang, Jian Han, Xing-bo Armaghani, Danial Jahed TA Engineering (General). Civil engineering (General) TH Building construction Road tunnels built in water-rich areas are prone to calcium leaching owing to long-term erosion by groundwater, which results in calcite deposition in tunnel drainage system. Calcite deposition can lead to the clogging of drainage pipes and water gutters. When these facilities are blocked, the groundwater behind the tunnel lining cannot be discharged in time, which will cause the increase of water pressure and seriously jeopardizes the stability of the concrete lining. Therefore, it can be seen that calcite deposition in tunnels is an urgent problem to be addressed. This research aims to analyse the causes of calcite deposition and to use sodium aluminate set accelerator as an object of study to investigate its effect on calcite deposition. In order to achieve this, an apparatus was developed to study the calcium leaching process in shotcrete and a mathematical model was developed to solve for the changes in calcium ions concentration during the calcium leaching process. By comparing the experimental results with the results of the mathematical model, the effect of sodium aluminate set accelerator on calcium leaching of shotcrete was analysed comprehensively. Results showed that the calcium in calcite is derived from the cement in shotcrete. Sodium aluminate affects the saturation concentration of Ca (OH)2 and C-S-H in the liquid phase and the crystallization of Ca(OH)2 and C-S-H in the solid phase. And a low dosage of sodium aluminate accelerates calcium leaching, thereby deteriorating the leaching resistance of shotcrete. Conversely, a high dosage of sodium aluminate inhibits calcium leaching, thereby enhancing the leaching resistance of shotcrete. Pergamon-Elsevier Science Ltd 2021-11 Article PeerReviewed Ye, Fei and He, Biao and Tian, Chong-ming and Zhao, Meng and Wang, Jian and Han, Xing-bo and Armaghani, Danial Jahed (2021) Influence of sodium aluminate on calcium leaching of shotcrete in tunnels. Tunnelling and Underground Space Technology, 117. ISSN 0886-7798, DOI https://doi.org/10.1016/j.tust.2021.104156 <https://doi.org/10.1016/j.tust.2021.104156>. 10.1016/j.tust.2021.104156
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	TA Engineering (General). Civil engineering (General) TH Building construction
spellingShingle	TA Engineering (General). Civil engineering (General) TH Building construction Ye, Fei He, Biao Tian, Chong-ming Zhao, Meng Wang, Jian Han, Xing-bo Armaghani, Danial Jahed Influence of sodium aluminate on calcium leaching of shotcrete in tunnels
description	Road tunnels built in water-rich areas are prone to calcium leaching owing to long-term erosion by groundwater, which results in calcite deposition in tunnel drainage system. Calcite deposition can lead to the clogging of drainage pipes and water gutters. When these facilities are blocked, the groundwater behind the tunnel lining cannot be discharged in time, which will cause the increase of water pressure and seriously jeopardizes the stability of the concrete lining. Therefore, it can be seen that calcite deposition in tunnels is an urgent problem to be addressed. This research aims to analyse the causes of calcite deposition and to use sodium aluminate set accelerator as an object of study to investigate its effect on calcite deposition. In order to achieve this, an apparatus was developed to study the calcium leaching process in shotcrete and a mathematical model was developed to solve for the changes in calcium ions concentration during the calcium leaching process. By comparing the experimental results with the results of the mathematical model, the effect of sodium aluminate set accelerator on calcium leaching of shotcrete was analysed comprehensively. Results showed that the calcium in calcite is derived from the cement in shotcrete. Sodium aluminate affects the saturation concentration of Ca (OH)2 and C-S-H in the liquid phase and the crystallization of Ca(OH)2 and C-S-H in the solid phase. And a low dosage of sodium aluminate accelerates calcium leaching, thereby deteriorating the leaching resistance of shotcrete. Conversely, a high dosage of sodium aluminate inhibits calcium leaching, thereby enhancing the leaching resistance of shotcrete.
format	Article
author	Ye, Fei He, Biao Tian, Chong-ming Zhao, Meng Wang, Jian Han, Xing-bo Armaghani, Danial Jahed
author_facet	Ye, Fei He, Biao Tian, Chong-ming Zhao, Meng Wang, Jian Han, Xing-bo Armaghani, Danial Jahed
author_sort	Ye, Fei
title	Influence of sodium aluminate on calcium leaching of shotcrete in tunnels
title_short	Influence of sodium aluminate on calcium leaching of shotcrete in tunnels
title_full	Influence of sodium aluminate on calcium leaching of shotcrete in tunnels
title_fullStr	Influence of sodium aluminate on calcium leaching of shotcrete in tunnels
title_full_unstemmed	Influence of sodium aluminate on calcium leaching of shotcrete in tunnels
title_sort	influence of sodium aluminate on calcium leaching of shotcrete in tunnels
publisher	Pergamon-Elsevier Science Ltd
publishDate	2021
url	http://eprints.um.edu.my/28681/
_version_	1735409569586216960
score	13.211869

Influence of sodium aluminate on calcium leaching of shotcrete in tunnels

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