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Open AccessArticle

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

School of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, China
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Materials 2019, 12(9), 1561; https://doi.org/10.3390/ma12091561
Received: 17 April 2019 / Revised: 6 May 2019 / Accepted: 8 May 2019 / Published: 13 May 2019
(This article belongs to the Special Issue Microstructures and Durability of Cement-Based Materials)
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 (FT-IR) spectroscopy, and backscattered electron (BSE) image analysis. The results show that a dense hardened paste of β-C2S 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-C2S mineral. View Full-Text
Keywords: backscattered electron image; dicalcium silicate; carbonation; microstructure backscattered electron image; dicalcium silicate; carbonation; microstructure
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Liu, S.; Guan, X.; Zhang, H.; Wang, Y.; Gou, M. Revealing the Microstructure Evolution and Carbonation Hardening Mechanism of β-C2S Pastes by Backscattered Electron Images. Materials 2019, 12, 1561.

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