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Materials (Basel). 2017 Aug 3;10(8). pii: E900. doi: 10.3390/ma10080900.

Effect of Calcium Carbonate Fineness on Calcium Sulfoaluminate-Belite Cement.

Author information

1
Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore. ceejeon@nus.edu.sg.
2
Department of Construction Management, University of North Florida, 1 UNF Dr., Jacksonville, FL 32224, USA. craig.hargis@unf.edu.
3
Division of Architecture and Urban Design, Incheon National University, Incheon 22012, Korea. scchun@inu.ac.kr.
4
Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore. ceemjh@nus.edu.sg.

Abstract

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.

KEYWORDS:

calcium sulfoaluminate; carbon dioxide reduction; cement hydration; green technology; limestone; sustainable concrete

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