Abstract
Ye’elimite (C4A3$) is the main phase in calcium sulfoaluminate (CSA) cement. To improve the performance of CSA cement, substitutions of Ca2+ by Sr2+ cations in C4A3$ can be done to synthesize Sr-bearing ye’elimite. In this study we performed crystallographic analysis of Sr-bearing ye’elimite (C4−xŠxA3$) synthesized with 0.25–3.00 mol Sr2+ ions. The effect of strontic substitutions on the crystal structure of ye’elimite was investigated. Compositions of clinkers and the lattice parameters of Sr-bearing ye’elimite were determined by the Rietveld method. Results showed that strontic substitutions promoted the transformation of the crystal system from orthorhombic to cubic for ye’elimite. Sr-bearing ye’elimite almost purely exists in a cubic structure when amounts of strontic substitutions exceed 1.25 mol. The amount of Sr-bearing ye’elimite in crystalline phases is over 95 wt% while impurities in the clinkers of Sr-bearing ye’elimite contain minor amounts of calcium aluminate phases. Lattice parameters of Sr-bearing ye’elimite exhibit linear growth with strontic substitutions increasing for both cubic and orthorhombic systems. Both calcium and strontium evenly distribute in the particles of Sr-bearing ye’elimite.
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This research was financially supported by National Natural Science Foundation of China (51472041).
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Zhao, J., Chang, J. Crystallographic Analysis of Sr-Bearing Ye’elimite. J Inorg Organomet Polym 27, 1694–1702 (2017). https://doi.org/10.1007/s10904-017-0631-8
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DOI: https://doi.org/10.1007/s10904-017-0631-8