Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C2S Pastes by Backscattered Electron Images

β-dicalcium silicate (β-C2S) minerals were prepared. The compositions, microstructures, and distributions of the carbonation products of hardened β-C2S paste were revealed by X-ray diffraction (XRD), Fourier transform-infrared...

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Main Authors:	Songhui Liu, Xuemao Guan, Haibo Zhang, Yuli Wang, Mifeng Gou
Format:	Article
Language:	English
Published:	MDPI AG 2019-05-01
Series:	Materials
Subjects:	backscattered electron image dicalcium silicate carbonation microstructure
Online Access:	https://www.mdpi.com/1996-1944/12/9/1561

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record_format	Article
spelling	doaj-d470aced86e54e12a9a4d1fde3c5fcb02020-11-25T00:20:50ZengMDPI AGMaterials1996-19442019-05-01129156110.3390/ma12091561ma12091561Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron ImagesSonghui Liu0Xuemao Guan1Haibo Zhang2Yuli Wang3Mifeng Gou4School of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, ChinaSchool of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, ChinaSchool of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, ChinaSchool of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, ChinaSchool of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, Chinaβ-dicalcium silicate (β-C<sub>2</sub>S) minerals were prepared. The compositions, microstructures, and distributions of the carbonation products of hardened β-C<sub>2</sub>S paste were revealed by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, and backscattered electron (BSE) image analysis. The results show that a dense hardened paste of β-C<sub>2</sub>S can be obtained after 24 h of carbonation curing. The hardened pastes are composed of pores, silica gel, calcium carbonate, and unreacted dicalcium silicate, with relative volume fractions of 1.3%, 42.1%, 44.9%, and 11.7%, respectively. The unreacted dicalcium silicate is encapsulated with a silica gel rim, and the pores between the original dicalcium silicate particles are filled with calcium carbonate. The sufficient carbonation products that rapidly formed during the carbonation curing process, forming a dense microstructure, are responsible for the carbonation hardening of the β-C<sub>2</sub>S mineral.https://www.mdpi.com/1996-1944/12/9/1561backscattered electron imagedicalcium silicatecarbonationmicrostructure
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Songhui Liu Xuemao Guan Haibo Zhang Yuli Wang Mifeng Gou
spellingShingle	Songhui Liu Xuemao Guan Haibo Zhang Yuli Wang Mifeng Gou Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron Images Materials backscattered electron image dicalcium silicate carbonation microstructure
author_facet	Songhui Liu Xuemao Guan Haibo Zhang Yuli Wang Mifeng Gou
author_sort	Songhui Liu
title	Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron Images
title_short	Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron Images
title_full	Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron Images
title_fullStr	Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron Images
title_full_unstemmed	Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron Images
title_sort	revealing the microstructure evolution and carbonation hardening mechanism of β-c<sub>2</sub>s pastes by backscattered electron images
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2019-05-01
description	β-dicalcium silicate (β-C<sub>2</sub>S) minerals were prepared. The compositions, microstructures, and distributions of the carbonation products of hardened β-C<sub>2</sub>S paste were revealed by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, and backscattered electron (BSE) image analysis. The results show that a dense hardened paste of β-C<sub>2</sub>S can be obtained after 24 h of carbonation curing. The hardened pastes are composed of pores, silica gel, calcium carbonate, and unreacted dicalcium silicate, with relative volume fractions of 1.3%, 42.1%, 44.9%, and 11.7%, respectively. The unreacted dicalcium silicate is encapsulated with a silica gel rim, and the pores between the original dicalcium silicate particles are filled with calcium carbonate. The sufficient carbonation products that rapidly formed during the carbonation curing process, forming a dense microstructure, are responsible for the carbonation hardening of the β-C<sub>2</sub>S mineral.
topic	backscattered electron image dicalcium silicate carbonation microstructure
url	https://www.mdpi.com/1996-1944/12/9/1561
work_keys_str_mv	AT songhuiliu revealingthemicrostructureevolutionandcarbonationhardeningmechanismofbcsub2subspastesbybackscatteredelectronimages AT xuemaoguan revealingthemicrostructureevolutionandcarbonationhardeningmechanismofbcsub2subspastesbybackscatteredelectronimages AT haibozhang revealingthemicrostructureevolutionandcarbonationhardeningmechanismofbcsub2subspastesbybackscatteredelectronimages AT yuliwang revealingthemicrostructureevolutionandcarbonationhardeningmechanismofbcsub2subspastesbybackscatteredelectronimages AT mifenggou revealingthemicrostructureevolutionandcarbonationhardeningmechanismofbcsub2subspastesbybackscatteredelectronimages
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Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C<sub>2</sub>S Pastes by Backscattered Electron Images

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