Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder

Geopolymer binders are adjudged as the latest wave of sustainable alkali-activated materials for soil stabilization due to their excellent bonding properties. This study applied metakaolin as a precursor for synthesizing the geopolymer binder by employing the mixture of quicklime and sodium bicarbon...

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Autores principales:	Shengnian Wang, Jun Su, Zhijian Wu, Wei Ma, Yue Li, Honglei Hui
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	soil stabilization geopolymer alkali-activation mixing ratio microstructural characteristics Physics QC1-999
Acceso en línea:	https://doaj.org/article/d857e4086bc444fbad29bcbfe9298a4a
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id	oai:doaj.org-article:d857e4086bc444fbad29bcbfe9298a4a
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spelling	oai:doaj.org-article:d857e4086bc444fbad29bcbfe9298a4a2021-12-01T05:03:17ZSilty Clay Stabilization Using Metakaolin-Based Geopolymer Binder2296-424X10.3389/fphy.2021.769786https://doaj.org/article/d857e4086bc444fbad29bcbfe9298a4a2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fphy.2021.769786/fullhttps://doaj.org/toc/2296-424XGeopolymer binders are adjudged as the latest wave of sustainable alkali-activated materials for soil stabilization due to their excellent bonding properties. This study applied metakaolin as a precursor for synthesizing the geopolymer binder by employing the mixture of quicklime and sodium bicarbonate as an alkali activator. The optimal mass mixing ratio of the alkali activator, metakaolin, and silty clay was determined by unconfined compression tests. The stabilization mechanisms of the geopolymer binder were measured by x-ray diffraction and Fourier transform infrared spectroscopy. The microstructural characteristics of the geopolymer-stabilized silty clay were observed by scanning electron microscopy with an energy dispersive x-ray spectroscopy and mercury intrusion porosimetry test for understanding the strengthening mechanism of the silty clay after the treatment. Results indicate that the optimal mass mixing ratio of the alkali activator, metakaolin, and silty clay is 1:2:17, and the unconfined compressive strength of the geopolymer-stabilized silty clay reaches the maximum value of 0.85 MPa with adding 15 wt% of the geopolymer binder. Diffraction patterns show an insufficient polymerization of the geopolymer binder in the silty clay in the early days but a rapid synthesis of aluminosilicate gels after that. The new asymmetrical stretching vibration peaks signified the formation of aluminosilicate networks and are responsible for the strength improvement of the silty clay. Microstructural analyses further confirm the formation of aluminosilicate gels and their positive impacts on the structure of the silty clay over curing age.Shengnian WangJun SuZhijian WuWei MaYue LiHonglei HuiFrontiers Media S.A.articlesoil stabilizationgeopolymeralkali-activationmixing ratiomicrostructural characteristicsPhysicsQC1-999ENFrontiers in Physics, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	soil stabilization geopolymer alkali-activation mixing ratio microstructural characteristics Physics QC1-999
spellingShingle	soil stabilization geopolymer alkali-activation mixing ratio microstructural characteristics Physics QC1-999 Shengnian Wang Jun Su Zhijian Wu Wei Ma Yue Li Honglei Hui Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder
description	Geopolymer binders are adjudged as the latest wave of sustainable alkali-activated materials for soil stabilization due to their excellent bonding properties. This study applied metakaolin as a precursor for synthesizing the geopolymer binder by employing the mixture of quicklime and sodium bicarbonate as an alkali activator. The optimal mass mixing ratio of the alkali activator, metakaolin, and silty clay was determined by unconfined compression tests. The stabilization mechanisms of the geopolymer binder were measured by x-ray diffraction and Fourier transform infrared spectroscopy. The microstructural characteristics of the geopolymer-stabilized silty clay were observed by scanning electron microscopy with an energy dispersive x-ray spectroscopy and mercury intrusion porosimetry test for understanding the strengthening mechanism of the silty clay after the treatment. Results indicate that the optimal mass mixing ratio of the alkali activator, metakaolin, and silty clay is 1:2:17, and the unconfined compressive strength of the geopolymer-stabilized silty clay reaches the maximum value of 0.85 MPa with adding 15 wt% of the geopolymer binder. Diffraction patterns show an insufficient polymerization of the geopolymer binder in the silty clay in the early days but a rapid synthesis of aluminosilicate gels after that. The new asymmetrical stretching vibration peaks signified the formation of aluminosilicate networks and are responsible for the strength improvement of the silty clay. Microstructural analyses further confirm the formation of aluminosilicate gels and their positive impacts on the structure of the silty clay over curing age.
format	article
author	Shengnian Wang Jun Su Zhijian Wu Wei Ma Yue Li Honglei Hui
author_facet	Shengnian Wang Jun Su Zhijian Wu Wei Ma Yue Li Honglei Hui
author_sort	Shengnian Wang
title	Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder
title_short	Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder
title_full	Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder
title_fullStr	Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder
title_full_unstemmed	Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder
title_sort	silty clay stabilization using metakaolin-based geopolymer binder
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/d857e4086bc444fbad29bcbfe9298a4a
work_keys_str_mv	AT shengnianwang siltyclaystabilizationusingmetakaolinbasedgeopolymerbinder AT junsu siltyclaystabilizationusingmetakaolinbasedgeopolymerbinder AT zhijianwu siltyclaystabilizationusingmetakaolinbasedgeopolymerbinder AT weima siltyclaystabilizationusingmetakaolinbasedgeopolymerbinder AT yueli siltyclaystabilizationusingmetakaolinbasedgeopolymerbinder AT hongleihui siltyclaystabilizationusingmetakaolinbasedgeopolymerbinder
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Silty Clay Stabilization Using Metakaolin-Based Geopolymer Binder

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