Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System

In this study, the influence of steel slag (SS) content on the strength of the cementitious materials was investigated. The quaternary active cementitious material (CaO-SiO2-Al2O3-SO3) was prepared using various proportions of steel slag (SS), granulated blast furnace slag (BFS), and desulfurized gy...

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Autores principales:	Fusheng Niu, Yukun An, Jinxia Zhang, Wen Chen, Shengtao He
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	steel slag granulated blast furnace slag full solid waste cementitious materials AFT C-S-H gel Technology T
Acceso en línea:	https://doaj.org/article/17a9623ed24849a6b40d937fd7b84878
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id	oai:doaj.org-article:17a9623ed24849a6b40d937fd7b84878
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spelling	oai:doaj.org-article:17a9623ed24849a6b40d937fd7b848782021-12-01T11:05:34ZSynergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System2296-801610.3389/fmats.2021.792682https://doaj.org/article/17a9623ed24849a6b40d937fd7b848782021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmats.2021.792682/fullhttps://doaj.org/toc/2296-8016In this study, the influence of steel slag (SS) content on the strength of the cementitious materials was investigated. The quaternary active cementitious material (CaO-SiO2-Al2O3-SO3) was prepared using various proportions of steel slag (SS), granulated blast furnace slag (BFS), and desulfurized gypsum (DG). The mechanism of synergistic excitation hydration of the cementitious materials was examined using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). The strength of the mortar test block was initially increased and decreased later with the increase of the SS content. Mortar test block with 20% steel slag, 65% granulated blast furnace slag, and 15% desulfurized gypsum with 0.35 water-binder ratio showed the highest compressive strength of 57.3 MPa on 28 days. The free calcium oxide (f-CaO) in the SS reacted with water and produced calcium hydroxide (Ca(OH)2) which created an alkaline environment. Under the alkaline environment, the alkali-activated reaction occurred with BFS. In the early stage of hydration reaction, calcium silicate hydrate (C-S-H) gel and fibrous hydration product ettringite (AFt) crystals were formed, which provided early strength to the cementitious materials. As the hydration reaction progressed, the interlocked growth of C-S-H gel and AFt crystals continued and promoted the increase of the strength of the cementitious system.Fusheng NiuYukun AnYukun AnJinxia ZhangWen ChenShengtao HeFrontiers Media S.A.articlesteel slaggranulated blast furnace slagfull solid waste cementitious materialsAFTC-S-H gelTechnologyTENFrontiers in Materials, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	steel slag granulated blast furnace slag full solid waste cementitious materials AFT C-S-H gel Technology T
spellingShingle	steel slag granulated blast furnace slag full solid waste cementitious materials AFT C-S-H gel Technology T Fusheng Niu Yukun An Yukun An Jinxia Zhang Wen Chen Shengtao He Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System
description	In this study, the influence of steel slag (SS) content on the strength of the cementitious materials was investigated. The quaternary active cementitious material (CaO-SiO2-Al2O3-SO3) was prepared using various proportions of steel slag (SS), granulated blast furnace slag (BFS), and desulfurized gypsum (DG). The mechanism of synergistic excitation hydration of the cementitious materials was examined using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). The strength of the mortar test block was initially increased and decreased later with the increase of the SS content. Mortar test block with 20% steel slag, 65% granulated blast furnace slag, and 15% desulfurized gypsum with 0.35 water-binder ratio showed the highest compressive strength of 57.3 MPa on 28 days. The free calcium oxide (f-CaO) in the SS reacted with water and produced calcium hydroxide (Ca(OH)2) which created an alkaline environment. Under the alkaline environment, the alkali-activated reaction occurred with BFS. In the early stage of hydration reaction, calcium silicate hydrate (C-S-H) gel and fibrous hydration product ettringite (AFt) crystals were formed, which provided early strength to the cementitious materials. As the hydration reaction progressed, the interlocked growth of C-S-H gel and AFt crystals continued and promoted the increase of the strength of the cementitious system.
format	article
author	Fusheng Niu Yukun An Yukun An Jinxia Zhang Wen Chen Shengtao He
author_facet	Fusheng Niu Yukun An Yukun An Jinxia Zhang Wen Chen Shengtao He
author_sort	Fusheng Niu
title	Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System
title_short	Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System
title_full	Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System
title_fullStr	Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System
title_full_unstemmed	Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System
title_sort	synergistic excitation mechanism of cao-sio2-al2o3-so3 quaternary active cementitious system
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/17a9623ed24849a6b40d937fd7b84878
work_keys_str_mv	AT fushengniu synergisticexcitationmechanismofcaosio2al2o3so3quaternaryactivecementitioussystem AT yukunan synergisticexcitationmechanismofcaosio2al2o3so3quaternaryactivecementitioussystem AT yukunan synergisticexcitationmechanismofcaosio2al2o3so3quaternaryactivecementitioussystem AT jinxiazhang synergisticexcitationmechanismofcaosio2al2o3so3quaternaryactivecementitioussystem AT wenchen synergisticexcitationmechanismofcaosio2al2o3so3quaternaryactivecementitioussystem AT shengtaohe synergisticexcitationmechanismofcaosio2al2o3so3quaternaryactivecementitioussystem
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Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System

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