Magnesium hydroxide sulfate hydrate (MHSH) whiskers are used to reinforce magnesium silicate hydrate (M-S-H) cement mortars as novel microfibrous materials because of their similar pH. The microstructure, mechanical performance, and reinforcement mechanism were investigated, and the results showed that the addition of between 1 and 5 wt% MHSH whiskers improved the compressive and flexural strengths of M-S-H cement mortars. The optimal compressive and flexural strengths were obtained at MHSH whisker contents between 3 and 4 wt%. The MHSH whiskers had a limited effect on the toughness of M-S-H cement, and mortars reinforced with MHSH whiskers exhibited brittle failure due to the small size of MHSH whiskers and low fiber bridging traction. Scanning electron microscopy (SEM) revealed that the microscale reinforcement mechanism of MHSH whiskers involved whisker pullout, crack deflection, whisker-cement coalition pullout, and whisker fracture. These mechanisms helped dissipate energy and optimize the stress distribution and transfer, which were crucial to improving the flexural strength. The SEM images revealed the rough and grooved surfaces of MHSH whiskers, and X-ray photoelectron spectroscopy (XPS) showed the presence of polar functional groups on the surface which resulted in the adhesion of M-S-H gel on MHSH whiskers due to good interfacial bonding. The mercury intrusion porosimetry (MIP) results indicated that the addition of MHSH whiskers reduced the porosity of M-S-H cement mortars, which also contributed to the increased compressive strength.

氢氧化镁水合硫酸镁（MHSH）晶须由于其相似的pH值而被用作新型微纤维材料来增强水合硅酸镁（MSH）水泥砂浆。研究了其微观结构，力学性能和增强机理，结果表明，添加1至5 wt％的MHSH晶须可提高MSH水泥砂浆的抗压强度和抗弯强度。在MHSH晶须含量为3-4 wt％时，可获得最佳的抗压强度和抗弯强度。MHSH晶须对MSH水泥的韧性影响有限，并且由于MHSH晶须的尺寸小和纤维桥联牵引力低，用MHSH晶须增强的砂浆表现出脆性破坏。扫描电子显微镜（SEM）显示，MHSH晶须的微观增强机制包括晶须拔出，裂纹变形，晶须水泥结合拔出和晶须断裂。这些机制有助于耗散能量并优化应力分布和传递，这对于提高抗弯强度至关重要。SEM图像显示了MHSH晶须的粗糙和沟槽表面，X射线光电子能谱（XPS）显示表面上存在极性官能团，这归因于良好的界面键合导致MSH凝胶粘附在MHSH晶须上。压汞法（MIP）的结果表明，添加MHSH晶须降低了MSH水泥砂浆的孔隙率，这也有助于提高抗压强度。晶须水泥联合撤出，晶须断裂。这些机制有助于耗散能量并优化应力分布和传递，这对于提高抗弯强度至关重要。SEM图像显示了MHSH晶须的粗糙和沟槽表面，X射线光电子能谱（XPS）显示表面上存在极性官能团，这归因于良好的界面键合导致MSH凝胶粘附在MHSH晶须上。压汞法（MIP）的结果表明，添加MHSH晶须降低了MSH水泥砂浆的孔隙率，这也有助于提高抗压强度。晶须水泥联合撤出，晶须断裂。这些机制有助于耗散能量并优化应力分布和传递，这对于提高抗弯强度至关重要。SEM图像显示了MHSH晶须的粗糙和沟槽表面，X射线光电子能谱（XPS）显示表面上存在极性官能团，这归因于良好的界面键合导致MSH凝胶粘附在MHSH晶须上。压汞法（MIP）的结果表明，添加MHSH晶须降低了MSH水泥砂浆的孔隙率，这也有助于提高抗压强度。这对于提高抗弯强度至关重要。SEM图像显示了MHSH晶须的粗糙和沟槽表面，X射线光电子能谱（XPS）显示表面上存在极性官能团，这归因于良好的界面键合导致MSH凝胶粘附在MHSH晶须上。压汞法（MIP）的结果表明，添加MHSH晶须降低了MSH水泥砂浆的孔隙率，这也有助于提高抗压强度。这对于提高抗弯强度至关重要。SEM图像显示了MHSH晶须的粗糙和沟槽表面，X射线光电子能谱（XPS）显示表面上存在极性官能团，这归因于良好的界面键合导致MSH凝胶粘附在MHSH晶须上。压汞法（MIP）的结果表明，添加MHSH晶须降低了MSH水泥砂浆的孔隙率，这也有助于提高抗压强度。