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.
作者简介: 王爱国,安徽建筑大学,教授,硕士研究生导师。2010年毕业于南京工业大学,获材料学博士学位。2017年于澳大利亚University of Southern Queensland, Centre for Future Materials做访问学者。主持和参与国家自然科学基金项目、安徽省高校自然科学研究重点研究项目、高性能土木工程材料国家重点实验室开放课题和材料化学工程国家重点实验室开放课题等省部级以上项目10项。Construction and Building Materials、Cement and Concrete Composites 、《材料导报》《硅酸盐通报》等学术期刊审稿人,中国建筑学会建筑材料分会化学激发胶凝材料专业委员会委员。主要研究方向为高性能水泥基材料/建筑功能材料/固体废弃物综合利用。 ;孙道胜,安徽建筑大学硕士研究生导师,受聘兼任中国科学院合肥物质科学研究院博士研究生导师。1986年本科毕业于重庆大学建筑材料及制品专业,获工学学士;2004年研究生毕业于南京工业大学材料学专业,获工学博士;2005年获聘教授。安徽省硅酸盐学会常务理事,安徽省水泥标准化技术委员会常务理事,安徽省水泥协会常务理事。主要从事高性能混凝土、固体废弃物的综合利用和先进建筑材料等方面的研究工作。
引用本文:
王爱国, 楚英杰, 徐海燕, 刘开伟, 马瑞, 董伟伟, 孙道胜. 碱式硫酸镁水泥的研究进展及性能提升技术[J]. 材料导报, 2020, 34(13): 13091-13099.
WANG Aiguo, CHU Yingjie, XU Haiyan, LIU Kaiwei, MA Rui, DONG Weiwei, SUN Daosheng. Research Progress and Performance Improvement Technology of Basic Magnesium Sulfate Cement. Materials Reports, 2020, 34(13): 13091-13099.
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