Use of CO 2 to Cure Steel Slag and Gypsum-Based Material

Xue Wang, Wen Ni, Jiajie Li, Siqi Zhang, Keqing Li and Wentao Hu
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Xue Wang: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Wen Ni: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jiajie Li: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Siqi Zhang: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Keqing Li: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Wentao Hu: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

Energies, 2021, vol. 14, issue 16, 1-15

Abstract: To improve the utilization of steel slag (SS) in CO 2 capture and making building materials, the paper mainly discussed the effects of desulphurization gypsum (DG) and w/s ratio on strength development and CO 2 capture capability of high Al content SS. It showed that 10 wt% DG enhanced the strength of hydration-curing SS by 262% at 28 days. Similarly, adding 6 wt% DG in carbonation-curing SS contributed to increases in strength and CO 2 uptake by 283% and 33.54%, reaching 42.68 MPa and 19.12%, respectively. Strength decreases and CO 2 uptake increases with w/s. Microanalysis (QXRD, SEM-EDS, TG-DTG, FTIR, XPS, and MIP) revealed that the main hydration products of SS were C-S-H gel and C 4 AH 13 , which transformed to ettringite with DG addition. The carbonation products were mainly calcite and aragonite. Additionally, the amount of aragonite, mechanically weaker than calcite, decreased and calcite increased significantly when DG was added in carbonation-curing samples, providing a denser structure and higher strength than those without DG. Furthermore, high Al 2p binding energies revealed the formation of monocarboaluminate in the DG-added carbonation samples, corresponding to higher CO 2 uptake. This study provides guidance for the preparation of SS-DG carbide building materials.

Keywords: steel slag; hydration and carbonation; CO 2 uptake; quantitative X-ray diffraction; X-ray photoelectron spectroscopy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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