Study on the Mechanism of Fly Ash in Magnesium Phosphate Cement
MENG Xiangrui1,2, LIU Yuantao1,2, CHEN Bing1,2,*, WANG Liyan3,*
1 State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2 Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University, Shanghai 200240, China 3 School of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China
Abstract: Fly ash (FA) was applied to modify magnesium phosphate cement (MPC) mortar by replacing a portion (≤30%) of magnesium oxide, and the reactivity and reaction mechanism of fly ash in the MPC system were investigated, the effect of FA on the physico-mechanical properties and microstructure of MPC was analyzed. The results showed that FA embodied complex physical and chemical effects in the MPC system. The spherical fly ash particles have the function of rolling bearings, which optimizes the fluidity of MPC; FA not only fills the micropores and microcracks of MPC, but also exhibits the ‘nucleating effect', which provides nucleation sites for the hydration of MPC, promotes the generation of the hydration product-struvite (MgNH4PO4·6H2O), densifies the microstructure and improves the mechanical properties of MPC. In addition, after the activation of hydration heat, Al2O3 from FA would participate in the reaction and generate amorphous aluminum phosphate gels.
通讯作者: *陈兵,上海交通大学长聘教授、博士研究生导师。2002年同济大学材料学专业博士毕业后到上海交通大学工作至今。目前主要从事新型水泥基复合材料方面的研究工作。发表论文200余篇,包括Cement and Concrete Research、Cement and Concrete Composites、Composites Part B、Construction and Building Materials等,自2019年以来,连续入选爱思唯尔中国大陆土木与结构工程学科高被引学者。hntchen@sjtu.edu.cn; 王立艳,吉林建筑大学教授、硕士研究生导师。2001年获长春工业大学硕士学位,并到吉林建筑大学工作,2009年获吉林大学高分子化学与物理专业博士学位。目前从事磷酸镁水泥复合材料和光催化材料的研究。近年来,在Construction and Building Materials、Journal of Building Engineering、Journal of Materials Chemistry A、Journal of Power Sources、RSC Advances、Materials Science in Semiconductor Processing等国际刊物上发表SCI论文20篇。wlynzy@163.com
孟祥瑞, 刘源涛, 陈兵, 王立艳. 粉煤灰在磷酸镁水泥体系中的作用机制研究[J]. 材料导报, 2024, 38(17): 24010084-7.
MENG Xiangrui, LIU Yuantao, CHEN Bing, WANG Liyan. Study on the Mechanism of Fly Ash in Magnesium Phosphate Cement. Materials Reports, 2024, 38(17): 24010084-7.
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2024, Vol. 38 
