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Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing

by Zhen Li 1, Zhen He 1,* and Yixin Shao 2
1
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
2
Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 730; https://doi.org/10.3390/ma11050730
Received: 16 April 2018 / Revised: 1 May 2018 / Accepted: 3 May 2018 / Published: 4 May 2018
This paper presents a study on the carbonation reaction heat and products of tricalcium silicate (C3S) paste exposed to carbon dioxide (CO2) for rapid curing. Reaction heat was measured using a retrofitted micro-calorimeter. The highest heat flow of a C3S paste subject to carbonation curing was 200 times higher than that by hydration, and the cumulative heat released by carbonation was three times higher. The compressive strength of a C3S paste carbonated for 2 h and 24 h was 27.5 MPa and 62.9 MPa, respectively. The 24-h carbonation strength had exceeded the hydration strength at 28 days. The CO2 uptake of a C3S paste carbonated for 2 h and 24 h was 17% and 26%, respectively. The X-ray diffraction (XRD), transmission electron microscope coupled with energy dispersive spectrometer (TEM-EDS), and 29Si magic angle spinning–nuclear magnetic resonance (29Si MAS-NMR) results showed that the products of a carbonated C3S paste were amorphous silica (SiO2) and calcite crystal. There was no trace of calcium silicate hydrate (C–S–H) or other polymorphs of calcium carbonate (CaCO3) detected. View Full-Text
Keywords: carbonation heat; carbonation curing; CO2 uptake; TEM-EDS; 29Si MAS NMR carbonation heat; carbonation curing; CO2 uptake; TEM-EDS; 29Si MAS NMR
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Li, Z.; He, Z.; Shao, Y. Early Age Carbonation Heat and Products of Tricalcium Silicate Paste Subject to Carbon Dioxide Curing. Materials 2018, 11, 730.

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