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Materials (Basel). 2019 May 13;12(9). pii: E1561. doi: 10.3390/ma12091561.

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

Author information

1
School of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, China. liusonghuicbma@163.com.
2
School of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, China. guanxuemaohpu@sina.com.
3
School of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, China. zhanghaibohpu@sina.com.
4
School of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, China. wangyuli@hpu.edu.cn.
5
School of Materials Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454000, China. goumifeng@hpu.edu.cn.

Abstract

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.

KEYWORDS:

backscattered electron image; carbonation; dicalcium silicate; microstructure

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