Effect of Al2O3 Doping on Carbonation Performance of γ-C2S

Abstract

Abstract: The effect of Al₂O₃ doping on the particle size, microstructure and mechanical properties of calcined γ-C₂S clinker was investigated. Results indicate that Al₂O₃ doping has no influence on the crystal form of γ-C₂S, but significantly changes its morphology. The undoped γ-C₂S grains exhibit wrinkly surface morphology and the particle size is larger. After Al₂O₃ doping, the grain surface becomes smooth. The compressive strength and the degree of carbonation of γ-C₂S carbonated for 24 h gradually increase with the increasing content of Al₂O₃. Based on the carbonation temperature rise, full width at half maximum of the diffraction peaks of calcium carbonate and the quantitative XRD analysis, Al₂O₃ doping retards the heat release of carbonation, which is beneficial for a more sustained carbonation reaction. Al₂O₃ doping also promotes the growth and the number of calcium carbonate crystals, which increases the degree of carbonation, densifies the carbonated matrix and increases the compressive strength.

Key words: aluminate oxide, γ-C₂S, carbonation, calcium carbonate, mechanical property, full width at half maximum

CLC Number:

TQ172.1

MING Xinzhao, LIU Zhichao, WANG Fazhou, HU Shuguang, HU Chuanlin. Effect of Al₂O₃ Doping on Carbonation Performance of γ-C₂S[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2003-2010.

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Effect of Al₂O₃ Doping on Carbonation Performance of γ-C₂S

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