Effect of nano-silica on properties and microstructures of magnesium phosphate cement
Effect of nano-silica on properties and microstructures of magnesium phosphate cement
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纳米二氧化硅对磷酸镁水泥性能和微观结构的影响
DOI：
10.1016/j.conbuildmat.2020.120728
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发表时间：
2020-12
影响因子：
7.4
通讯作者：
Qin Zhaohui
中科院分区：
文献类型：
--
作者：
Liu Yuantao;Chen Bing;Qin Zhaohui
研究了纳米SiO2对磷酸镁水泥（MPC）性能的影响，从新拌性能、力学性能、微观结构和水化产物等方面进行了分析。结果表明，纳米SiO_2的加入量在0%~ 6%范围内，使水泥浆体的流动性降低，凝结时间缩短。纳米SiO2的加入提高了硬化试样的力学性能，其中添加4%纳米SiO2（NS 4）的硬化试样28 d抗压强度最高，为95.3MPa。NS 4的流动度为270 mm，凝结时间接近20 min，满足快速修补材料的要求。采用X射线衍射（XRD）、扫描电子显微镜-能谱仪（SEM-EDS）、傅里叶变换红外光谱（FTIR）和热分析（TGA-DTG）对硬化浆体的微观结构和水化产物进行分析。超细纳米材料在MPC中具有良好的填孔作用，使MPC的微观结构更加致密。纳米二氧化硅具有高度反应性，可以参与MPC的酸基反应。对镁硅体系水化机理的研究证实，硬化过程中释放的大量热量促进了水化镁硅酸盐（M-S-H）和水镁石（Mg（OH）2）的形成。
The prime concern of this work was to investigate the effects of nano-silica on the properties of magnesium phosphate cement (MPC), and were analyzed in terms of the fresh property, mechanical performance, microstructure, and hydration products. The results showed that successive additions of nano-silica from 0% to 6% caused a decreased fluidity and a shortened setting time of the fresh paste. The mechanical property of the hardened sample was enhanced by adding nano-silica, and the group containing 4% nano-silica (NS4) yielded the 28-day compressive strength of 95.3 MPa, which was the highest in the research. For NS4 with a fluidity of 270 mm and a setting time near 20 min, it met the requirement of the rapid-repair material. The microstructure and hydration product analyses of the hardened paste were conducted by X-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectrometer (SEM-EDS), Fourier Transform Infrared Spectroscopy (FTIR), and thermal analysis (TGA-DTG). The ultra-fine nanomaterial had an excellent pore-filling effect in MPC, which compacted the microstructure. Nano-silica was highly reactive and could be involved in the acid-based reaction of MPC. The investigation on the hydration mechanism of magnesium-silica system confirmed that the vast heat released during the hardening period promoted the formation of magnesium silicate hydrates (M-S-H) and brucite (Mg(OH)2).
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影响因子：
3.4
作者：
Lothenbach, Barbara;Xu, Biwan;Winnefeld, Frank
通讯作者：
Winnefeld, Frank
磷酸镁铝水泥砂浆水稳定性试验研究
影响因子：
7.4
作者：
Fan, Shijian;Chen, Bing
通讯作者：
Chen, Bing
影响因子：
7.4
作者：
Fan Shijian;Chen Bing
通讯作者：
Chen Bing
影响因子：
7.4
作者：
M. Torres‐Carrasco;J. Reinosa;M. de la Rubia;E. Reyes;F. Alonso Peralta;Carlos Segovia Fernández
通讯作者：
M. Torres‐Carrasco;J. Reinosa;M. de la Rubia;E. Reyes;F. Alonso Peralta;Carlos Segovia Fernández
影响因子：
3
作者：
P. Mácová;A. Viani
通讯作者：
P. Mácová;A. Viani