DOI: 10.1016/j.jcou.2018.08.018
Scopus记录号: 2-s2.0-85052541741
论文题名: Effect of barium doping on carbonation behavior of γ-C2S
作者: Mu Y. ; Liu Z. ; Wang F. ; Huang X.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 27 起始页码: 405
结束页码: 413
语种: 英语
英文关键词: Barium doping
; Calcium carbonate
; Carbonation
; γ-Dicalcium silicate
Scopus关键词: Calcium carbonate
; Carbon dioxide
; Carbonation
; Compressive strength
; Crystal impurities
; Mortar
; Powders
; Semiconductor doping
; Silicates
; Barium doping
; Barium hydroxide
; Carbonation reactions
; Dicalcium silicate
; Heat evolution
; High reactivity
; Maximum temperature
; Metastable phase
; Barium compounds
英文摘要: The gamma polymorph of dicalcium silicate (γ-C2S) is a potential low-carbon binder owing to its relatively high reactivity with carbon dioxide. This study invstigates the effect of barium (Ba) as a typical impurity on the carbonation characteristics of γ-C2S. Results on the calcined γ-C2S powders indicate that Ba doping has little effect on the crystal form of γ-C2S, but substantially alters its morphology that is characterized by the increasing presence of wrinkles on the surface. Heat evolution during carbonation of the compacted γ-C2S mortar mixtures shows the suppression of maximum temperature and the delay in reaching the peak in the very early age. This may be associated with the hindering of calcium dissociation as a result of the barium presence. The measured degree of carbonation and compressive strength development of the mortar samples are lower in the early stage but exceed the control in the later stage with a higher barium hydroxide (BH) doping amount. This can be attributed to the reduced thickness of moisture film coating the γ-C2S particles. This retards the initial carbonation reaction, which may be beneficial for the penetration of CO2 into the sample interior, thus promoting the universal degree of carbonation in the long term. Analysis on the carbonation products reveals aragonite is the preferable metastable calcium carbonate at a low BH doping amount while vaterite is exclusively found as the metastable phase at a high BH amount. © 2018 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111788
Appears in Collections: 气候减缓与适应
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作者单位: School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China; State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China
Recommended Citation:
Mu Y.,Liu Z.,Wang F.,et al. Effect of barium doping on carbonation behavior of γ-C2S[J]. Journal of CO2 Utilization,2018-01-01,27