碱式硫酸镁水泥的研究进展及性能提升技术

doi:10.11896/cldb.19060108

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Abstract Basic magnesium sulfate cement (BMSC) is a new type of magnesium cementitious material with the core of admixture technology. It is mainly made up of lightly burned magnesia, magnesium sulfate, mineral admixture of different crystal water and chemical admixture. It is used in the same way as ordinary Portland cement.
Basic magnesium sulfate cement has similar advantages with magnesium oxychloride cement, such as light weight, fast setting, high strength, wear resistance, and is not easy to absorb moisture and anti-halogen. The solubility of its main hydration product 5Mg(OH)₂·MgSO₄·7H₂O phase (5·1·7 phase) is only 0.034 g/100 g water, which is basically the same as Portland cement, much lower than magnesium oxychloride cement, which can widely replace magnesium oxychloride cement in the field of building insulation materials. In addition, the BMSC’s flexural strength is 2—3 times than that of the Portland cement at the same strength grade, and its durability and reinforcement protection performance is similar to Portland cement. Besides, BMSC concrete has large rigidity, good seismic performance and its bending, tensile and impact resistance performance are better than that of the Portland cement concrete at the same grade, which also has a good application prospect in the field of structural engineering. More importantly, the calcination temperature of light burned magnesia used to prepare BMSC is low, which makes BMSC meet the requirements of building energy conservation and environmental protection, and is expected to become the core high-performance eco-friendly cement in the future with great development potential.
In this paper, the preparation and hydration process of BMSC are reviewed. The microstructure and performance difference of BMSC, magnesium oxychloride cement and magnesium oxysulfate cement are compared and analyzed. The effects of content and activity of α-MgO in the magnesium materials, the proportioning molar ratio of α-MgO/MgSO₄ and H₂O/MgSO₄, the type and dosage of chemical admixture on the microstructure and properties of BMSC are clarified. On this basis, measures to furtherly improve the performance of BMSC are proposed from the aspects of raw materials and preparation processes.

Key words： basic magnesium sulfate cement 5·1·7 phase microstructure improvement technology

Published: 24 June 2020

CLC number:

TU528.041

Fund:National Natural Science Foundation of China (51778003), Opening Foundation of State Key Laboratory of High Performance Civil Engineering Materials (2018CEM002), Anhui Province Higher Education Revitalization Program ([2014]No.11), Anhui Provincial Education Department (gxfxZD2016134), Initial Scientific Research Fund of Anhui Jianzhu University (2018QD60)

About author:: Aiguo Wangreceived his Ph.D. degree in materials from Nanjing Tech University in 2010. He performed his visting researches in University of Southern Queensland, Centre for Future Materials of Australia in 2017. He has been an associate professor and masterial tutor from 2013 in Anhui Jianzhu University. He has hosted and participated in 10 provincial or ministerial level research projects including National Natural Scie-nce Foundation of China, Natural Science Foundation of Higher Education of Anhui Province, Open Project of State Key Laboratory of High Performance Civil Engineering Materials, and Open Project of State Key Laboratory of Materials and Chemical Engineering, and so on. He assumes reviewer of journals like Construction and Building Materials, Cement and Concrete Composites, Cement and Concrete Composites, Materials Reports, Bulletin of the Chinese Ceramic Society. He is also the Member of Professional Committee of Chemically Induced Cementitious Materials of China Architecture Society Building Materials Branch. His major interstes are high perfor-mances cementitious composite materials, building functional materials & comprehensive utilization of solid waste.
Daosheng Sunreceived his B.E. degree in building materials and products from Chongqing University in 1986 and received his Ph.D. degree in materials from the Nanjing Tech University in 2004. He was granted professor in 2005. He is the tutor of Anhui Jianzhu University and Hefei Institute of Physical Science,Chinese Academy of Sciences. He is the member of Anhui Silicate Society, Anhui Cement Standardization Technical Committee and Anhui Cement Association. His research interests include high-performance concrete, comprehensive utilization of solid waste, and advanced building materials.

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	WANG Aiguo
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	MA Rui
	DONG Weiwei
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Cite this article:

WANG Aiguo,CHU Yingjie,XU Haiyan, et al. Research Progress and Performance Improvement Technology of Basic Magnesium Sulfate Cement[J]. Materials Reports, 2020, 34(13): 13091-13099.

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http://www.mater-rep.com/EN/10.11896/cldb.19060108 OR http://www.mater-rep.com/EN/Y2020/V34/I13/13091

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