磷镁物质的量比对天然水镁石制备的磷酸镁水泥性能的影响

doi:10.11896/cldb.23120159

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Abstract In this work, magnesium phosphate cement (MPC) was prepared by natural brucite without calcination. The influence of molar ratio of phosphate to magnesium (P/M) on the workability, mechanical properties, phase compositions and microstructure of the MPC was mainly investigated. The results showed that with the decrease of P/M, the fluidity of the MPC paste decreased gradually, the setting time extended, and the compressive strength increased first and then decreased. When the P/M was 1/4, the comprehensive performance of MPC was promising, which the fluidity was 110 mm, the setting time was 7 min, and the 1 d and 28 d compressive strengths were 20.0 MPa and 43.7 MPa, respectively. The microscopic test results showed that the hydration products of the MPC were MgKPO₄·6H₂O and Ca₁₀(OH)₂(PO₄)₂. After 28 d hydration reaction of the MPC, brucite did not completely reacted. With the decrease of P/M, the structural compactness of hardened matrix increased, the total porosity decreased.

Key words： brucite magnesium phosphate cement P/M macro-property hydration products

Published: 10 September 2024 Online: 2024-09-30

CLC number:

TU528.59

Fund:China National Key Research and Development Plan Project (2022YFC3803103), the National Natural Science Foundation of China (52108188),the Opening Project of State Key Laboratory of Green Building Materials (2022GBM10), the Open Research Fund of Key Laboratory of Water Engineering Materials of Ministry of Water Resources, China Institute of Water Resources and Hydropower Research (EMF202407).

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	Articles by authors
	LI Yue
	LONG Shiru
	WANG Zigeng
	WANG Nan

Cite this article:

LI Yue,LONG Shiru,WANG Zigeng, et al. Effect of Molar Ratio of Phosphate to Magnesium on Properties of Magnesium Phosphate Cement Prepared by Natural Brucite[J]. Materials Reports, 2024, 38(17): 23120159-6.

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http://www.mater-rep.com/EN/10.11896/cldb.23120159 OR http://www.mater-rep.com/EN/Y2024/V38/I17/23120159

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