Effect of curing regimes on chloride binding capacity of geopolymer

Chloride attack on reinforced concrete is considered the most important aspect in concrete durability investigation. This study is carried out to investigate effect of curing condition on the chloride binding capacity of fly ash geopolymer pastes containing a range of cast in chloride contents (NaCL...

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Autores principales:	Ola A. Mayhoub, Alaa Mohsen, Yousef R. Alharbi, Aref A. Abadel, A.O. Habib, Mohamed Kohail
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Chlorid resistant Fly ash Microwave curing Binding capacity Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/14f769ef154b4315978c21f957e66a87
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spelling	oai:doaj.org-article:14f769ef154b4315978c21f957e66a872021-11-22T04:23:14ZEffect of curing regimes on chloride binding capacity of geopolymer2090-447910.1016/j.asej.2021.04.032https://doaj.org/article/14f769ef154b4315978c21f957e66a872021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2090447921002215https://doaj.org/toc/2090-4479Chloride attack on reinforced concrete is considered the most important aspect in concrete durability investigation. This study is carried out to investigate effect of curing condition on the chloride binding capacity of fly ash geopolymer pastes containing a range of cast in chloride contents (NaCL), varying from 1%, 2% and 4% by mass of binder. The applied curing regimes were normal, oven, steam and microwave. The impact of induced chlorides on the compressive strength and on the chloride binding capacity of fly ash geopolymers under different curing conditions is determined. A detailed microstructure and phase composition analysis were conducted through SEM and XRD tests. It was observed that applying thermal curing conditions could increase the chloride binding capacity to the formed geopolyric hydration product. High curing temperatures promote the precursor dissolution reactions and will increase the overall generation of polymerization reaction products, while under normal curing a lot of fly ash grains did not fully react. Therefore, thermal curing is important in the activation of geopolymerization process that increase aluminosilicate gel and result in dense and less porous geopolymer matrix and yields in high compressive strength. This results in the physical adsorption and chemical binding of chloride ions on the gel surface, and hence reducing the rate of chloride ingress. It was concluded that the ingress of chlorides can be particularly controlled better through binding the free chloride ions under steam and microwave curing in the fly ash geopolymer concrete.Ola A. MayhoubAlaa MohsenYousef R. AlharbiAref A. AbadelA.O. HabibMohamed KohailElsevierarticleChlorid resistantFly ashMicrowave curingBinding capacityEngineering (General). Civil engineering (General)TA1-2040ENAin Shams Engineering Journal, Vol 12, Iss 4, Pp 3659-3668 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chlorid resistant Fly ash Microwave curing Binding capacity Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Chlorid resistant Fly ash Microwave curing Binding capacity Engineering (General). Civil engineering (General) TA1-2040 Ola A. Mayhoub Alaa Mohsen Yousef R. Alharbi Aref A. Abadel A.O. Habib Mohamed Kohail Effect of curing regimes on chloride binding capacity of geopolymer
description	Chloride attack on reinforced concrete is considered the most important aspect in concrete durability investigation. This study is carried out to investigate effect of curing condition on the chloride binding capacity of fly ash geopolymer pastes containing a range of cast in chloride contents (NaCL), varying from 1%, 2% and 4% by mass of binder. The applied curing regimes were normal, oven, steam and microwave. The impact of induced chlorides on the compressive strength and on the chloride binding capacity of fly ash geopolymers under different curing conditions is determined. A detailed microstructure and phase composition analysis were conducted through SEM and XRD tests. It was observed that applying thermal curing conditions could increase the chloride binding capacity to the formed geopolyric hydration product. High curing temperatures promote the precursor dissolution reactions and will increase the overall generation of polymerization reaction products, while under normal curing a lot of fly ash grains did not fully react. Therefore, thermal curing is important in the activation of geopolymerization process that increase aluminosilicate gel and result in dense and less porous geopolymer matrix and yields in high compressive strength. This results in the physical adsorption and chemical binding of chloride ions on the gel surface, and hence reducing the rate of chloride ingress. It was concluded that the ingress of chlorides can be particularly controlled better through binding the free chloride ions under steam and microwave curing in the fly ash geopolymer concrete.
format	article
author	Ola A. Mayhoub Alaa Mohsen Yousef R. Alharbi Aref A. Abadel A.O. Habib Mohamed Kohail
author_facet	Ola A. Mayhoub Alaa Mohsen Yousef R. Alharbi Aref A. Abadel A.O. Habib Mohamed Kohail
author_sort	Ola A. Mayhoub
title	Effect of curing regimes on chloride binding capacity of geopolymer
title_short	Effect of curing regimes on chloride binding capacity of geopolymer
title_full	Effect of curing regimes on chloride binding capacity of geopolymer
title_fullStr	Effect of curing regimes on chloride binding capacity of geopolymer
title_full_unstemmed	Effect of curing regimes on chloride binding capacity of geopolymer
title_sort	effect of curing regimes on chloride binding capacity of geopolymer
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/14f769ef154b4315978c21f957e66a87
work_keys_str_mv	AT olaamayhoub effectofcuringregimesonchloridebindingcapacityofgeopolymer AT alaamohsen effectofcuringregimesonchloridebindingcapacityofgeopolymer AT yousefralharbi effectofcuringregimesonchloridebindingcapacityofgeopolymer AT arefaabadel effectofcuringregimesonchloridebindingcapacityofgeopolymer AT aohabib effectofcuringregimesonchloridebindingcapacityofgeopolymer AT mohamedkohail effectofcuringregimesonchloridebindingcapacityofgeopolymer
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Effect of curing regimes on chloride binding capacity of geopolymer

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