偏铝酸钠激发石灰石粉的胶凝材料合成机理研究

doi:10.11896/cldb.22030034

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Abstract Limestone is abundant on earth.Aiming to highly utilize limestone, sodium metaaluminate (NaAlO₂) and limestone powder were used to prepare cementitious material in this work. The influences of NaAlO₂ contents on setting time and mechanical properties of the formed pastes were investigated. The phase composition, infrared absorption properties and microstructure of the NaAlO₂ activated limestone pastes were analyzed to reveal their reaction mechanisms. The experimental results further showed that the binder had an initial setting time of 71 min when 15wt% NaAlO₂was used. When adding 20wt% NaAlO₂, the 3 d compressive strength of the sample reached 25.3 MPa. NaAlO₂ enabled promoting the slow dissolution and recrystallization of limestone powder to form layered double hydroxide- Ca₄Al₂(OH)₁₂(CO₃)·5H₂O. Such slow dissolution may lead to the prolongation of setting time of the formed pastes because the ions donated by excessive NaAlO₂, such as Na⁺, Al(OH)₄^-, OH^-, could not be consumed in time. Therefore, it is imperative to control the amount of NaAlO₂ below 20% of the binder material when preparing the reasonable NaAlO₂-activated limestone pastes. This study provides important guidance for the high-efficient application of calcium carbonate-based cementitious materials.

Key words： limestone powder sodium metaaluminate alkali-activation reaction mechanism layered double hydroxide

Published: 10 January 2023 Online: 2023-01-31

CLC number:

TU526

Fund:National Natural Science Foundation of China (52108228,51925805).

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	LIU Yuantao
	WANG Yanshuai
	DONG Biqin

Cite this article:

LIU Yuantao,WANG Yanshuai,DONG Biqin. Synthesis Mechanisms of Sodium Metaaluminate-activated Limestone-based Cementitious Material[J]. Materials Reports, 2023, 37(1): 22030034-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22030034 OR http://www.mater-rep.com/EN/Y2023/V37/I1/22030034

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