Tan Yongshan, Yu Hongfa, Sun Shikuan, Wu Chengyou, Ding Hao
College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China.
Research Institute of Green Building Materials, Yangzhou University, Yangzhou 225127, China.
Constr Build Mater. 2021 Jan 10;266:121076. doi: 10.1016/j.conbuildmat.2020.121076. Epub 2020 Oct 13.
Silica fume (SF) as an important supplementary cementitious material has been widely used in Portland cement, but few published articles have reported on the effect of SF on the performance and hydration mechanism of basic magnesium sulfate cement (BMSC). In the present work, the properties, microstructure and hydration mechanism of BMSC influenced by SF was studied systematically. The results show that the setting time and compressive strength of BMSC may increase with the increase of SF content, while the hydration heat will decrease with the increase of SF content. Mercury intrusion porosimetry (MIP), X-ray computed tomography (X-CT), scanning electron microscope- Energy dispersive spectrometer (SEM-EDS) results show that SF exhibits filling effect in the BMSC matrix, which makes the microstructure of BMSC matrix with SF more compact. In addition, solid-state magnetic resonance (NMR) and SEM-EDS analysis indicate that the activity of SF was excited in the BMSC matrix, resulting in the formation of M-S-H gel.
硅灰（SF）作为一种重要的辅助胶凝材料已在波特兰水泥中广泛应用，但鲜有已发表的文章报道硅灰对碱式硫酸镁水泥（BMSC）性能及水化机理的影响。在本研究中，系统研究了硅灰对碱式硫酸镁水泥性能、微观结构及水化机理的影响。结果表明，碱式硫酸镁水泥的凝结时间和抗压强度可能随硅灰含量的增加而增加，而水化热会随硅灰含量的增加而降低。压汞法（MIP）、X射线计算机断层扫描（X-CT）、扫描电子显微镜-能谱仪（SEM-EDS）结果表明，硅灰在碱式硫酸镁水泥基体中表现出填充效应，这使得含硅灰的碱式硫酸镁水泥基体微观结构更加致密。此外，固态核磁共振（NMR）和SEM-EDS分析表明，硅灰在碱式硫酸镁水泥基体中的活性被激发，从而导致形成M-S-H凝胶。
