Influence of Mg(OH)2 on the Hydration Process and Properties of Magnesium Phosphate Cement
CHEN Jiawei1, ZHANG Yunqiao1, CHEN Zhuofan1, LIU Zhi1, LI Jun1, LU Zhongyuan1, LAI Zhenyu1,2,*
1 State Key Laboratory of Environmental-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China 2 Department of Architecture Engineering, Sichuan Polytechnic University, Deyang 618030, Sichuan, China
Abstract: The magnesium raw material for magnesium phosphate cement (MPC) is mainly dead-burned MgO. However, the high-temperature calcination required for producing dead-burned MgO results in high costs and excessive carbon emissions. magnesium hydroxide (Mg(OH)2) is abundant, has low production costs, and is environmentally safe and pollution-free. Mg(OH)2 is a rich source of low-cost, non-polluting, safe and environmentally friendly, which is of great significance to alleviate the problem of high cost of use and carbon emissions if it can be adopted in large quantities. Therefore, in this work, Mg(OH)2 was used instead of partially dead-burned MgO, by means of tests such as X-ray diffraction, thermal analysis, scanning electron microscopy and energy spectrum analysis, the effects on workability, hydration process, strength development and microstructure were investigated. The results showed that the incorporation of Mg(OH)2 accelerated the hydration process of MPC, the fluidity of the slurry was reduced and the setting time was shortened. In this paper, the working properties are improved by retardation means such as water glass heat treatment modification. The hydration temperature and pH of magnesium phosphate cement decreased significantly with the incorporation of Mg(OH)2, increased number of K-struvite crystals in the later 28 d, compressive strength decreases with increasing Mg(OH)2 content. When Mg(OH)2 is doped within 50%, its late strength decreases in the range of 15%, with the increase of Mg(OH)2 doping, more hydration products are formed by the reaction of Mg(OH)2. When Mg(OH)2 doping accounted for 66.6%, the reactivity of dead-burned MgO was reduced from an average value of 22% to 7%. In conclusion, the preparation of magnesium phosphate cement with large amount of Mg(OH)2 is feasible and can ensure that the later mechanical properties of the material can meet the requirements of engineering applications. It has potential applications for reducing the cost of magnesium phosphate cement use and carbon emissions.
通讯作者: *赖振宇,四川工程职业技术学院教授。1992年华东理工大学无机材料系无机非金属材料本科毕业,2006年西南科技大学材料科学与工程学院材料学业硕士毕业,2012年重庆大学材料科学与工程专业博士毕业,1996—2023年先后在西南科技大学材料科学与工程学院和环境友好能源材料国家重点实验室工作,目前在四川工程职业技术学院工作。主要从事新型胶凝材料、固体废物资源化利用方面的研究工作。发表论文80余篇,包括Cement and Concrete Research、Construction and Building Materials、Ceramics International、Science of the Total Environment、Nanoscale Research Letters、Journal Wuhan University of Technology、Materials Science Edition、《硅酸盐学报》《功能材料》《环境科学学报》等。获得中国建筑材料联合会建筑材料科学技术奖二等奖1项。laizhenyu@swust.edu.cn
陈嘉伟, 张芸侨, 陈卓凡, 刘智, 李军, 卢忠远, 赖振宇. Mg(OH)2对磷酸镁水泥水化过程及性能的影响[J]. 材料导报, 2024, 38(17): 24010085-7.
CHEN Jiawei, ZHANG Yunqiao, CHEN Zhuofan, LIU Zhi, LI Jun, LU Zhongyuan, LAI Zhenyu. Influence of Mg(OH)2 on the Hydration Process and Properties of Magnesium Phosphate Cement. Materials Reports, 2024, 38(17): 24010085-7.
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2024, Vol. 38 
