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Materials 2017, 10(8), 900; doi:10.3390/ma10080900

Effect of Calcium Carbonate Fineness on Calcium Sulfoaluminate-Belite Cement

Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore
Department of Construction Management, University of North Florida, 1 UNF Dr., Jacksonville, FL 32224, USA
Division of Architecture and Urban Design, Incheon National University, Incheon 22012, Korea
Authors to whom correspondence should be addressed.
Received: 19 June 2017 / Revised: 14 July 2017 / Accepted: 1 August 2017 / Published: 3 August 2017
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This study investigated the hydration characteristics and strength development of calcium sulfoaluminate-belite (CSAB) cements incorporating calcium carbonate (CC) powders with various particle size distributions and different gypsum amounts. In general, the CSAB hydration was accelerated by the CC powder, but the acceleration and resulting strength improvement were more effective with finer CC powder. Regardless of the fineness of the CC powder, it took part in the hydration of CSAB cement, forming hemicarboaluminate and monocarboaluminate phases. These hydration and nucleation effects compensated for the strength reduction from decreased cementing components (i.e., dilution effect) when finer CC powders were used, while they did not overcome the strength reduction when coarser CC powder was used. On the other hand, increasing the amount of gypsum for a given CC content improved the strength. The strength of CSAB cement had a clear inverse relationship with its total pore volume measured by mercury intrusion porosimetry (MIP). Thermodynamic modeling for CSAB cement hydration showed that the use of CC powder increased total volume of solid phases up to 6 wt % at a given amount of gypsum. View Full-Text
Keywords: green technology; sustainable concrete; carbon dioxide reduction; limestone; calcium sulfoaluminate; cement hydration green technology; sustainable concrete; carbon dioxide reduction; limestone; calcium sulfoaluminate; cement hydration

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jeong, Y.; Hargis, C.W.; Chun, S.; Moon, J. Effect of Calcium Carbonate Fineness on Calcium Sulfoaluminate-Belite Cement. Materials 2017, 10, 900.

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