Please use this identifier to cite or link to this item: https://doi.org/10.3390/ma10020131
Title: Effects of incorporating high-volume fly ash into tricalcium silicate on the degree of silicate polymerization and aluminum substitution for silicon in calcium silicate hydrate
Authors: Bae, S
Taylor, R
Kilcoyne, D
Moon, J 
Monteiro, P.J.M
Keywords: Aluminum
Calcium
Concrete beams and girders
Crystal atomic structure
Fly ash
High resolution transmission electron microscopy
Hydrates
Hydration
Magic angle spinning
Magnetic resonance spectroscopy
Nuclear magnetic resonance spectroscopy
Polymerization
Silicate minerals
Silicates
Silicon
Thermogravimetric analysis
Transmission electron microscopy
Calcium silicate hydrate
Hydration products
Isothermal conduction calorimetries
Magic angle spinning nuclear magnetic resonance spectroscopy
Silicate polymerizations
Soft x-ray spectromicroscopy
Tricalcium silicate
X ray microscopy
Calcium silicate
Issue Date: 2017
Publisher: MDPI AG
Citation: Bae, S, Taylor, R, Kilcoyne, D, Moon, J, Monteiro, P.J.M (2017). Effects of incorporating high-volume fly ash into tricalcium silicate on the degree of silicate polymerization and aluminum substitution for silicon in calcium silicate hydrate. Materials 10 (2) : 131. ScholarBank@NUS Repository. https://doi.org/10.3390/ma10020131
Rights: Attribution 4.0 International
Abstract: This study assesses the quantitative effects of incorporating high-volume fly ash (HVFA) into tricalcium silicate (C 3 S) paste on the hydration, degree of silicate polymerization, and Al substitution for Si in calcium silicate hydrate (C-S-H). Thermogravimetric analysis and isothermal conduction calorimetry showed that, although the induction period of C 3 S hydration was significantly extended, the degree of hydration of C 3 S after the deceleration period increased due to HVFA incorporation. Synchrotron-sourced soft X-ray spectromicroscopy further showed that most of the C 3 S in the C 3 S-HVFA paste was fully hydrated after 28 days of hydration, while that in the pure C 3 S paste was not. The chemical shifts of the Si K edge peaks in the near-edge X-ray fine structure of C-S-H in the C 3 S-HVFA paste directly indicate that Al substitutes for Si in C-S-H and that the additional silicate provided by the HVFA induces an enhanced degree of silicate polymerization. This new spectromicroscopic approach, supplemented with 27 Al and 29 Si magic-angle spinning nuclear magnetic resonance spectroscopy and transmission electron microscopy, turned out to be a powerful characterization tool for studying a local atomic binding structure of C-S-H in C 3 S-HVFA system and presented results consistent with previous literature. © 2017 by the authors.
Source Title: Materials
URI: https://scholarbank.nus.edu.sg/handle/10635/179768
ISSN: 1996-1944
DOI: 10.3390/ma10020131
Rights: Attribution 4.0 International
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