片状纳米勃姆石对水泥力学及微观性能的影响

Effect of Flaky Nano Boehmite on Mechanical and Microscopic Properties of Cement

掺加纳米颗粒会影响到材料的力学性能,本文采用水热法在碱性环境下合成了片状纳米勃姆石,并将其加入到水泥中,研究了片状纳米勃姆石对水泥浆体力学性能的影响规律,并结合水化热、X射线衍射分析、热分析、氮吸附分析、扫描电子显微镜分析等测试手段对片状纳米勃姆石在水泥中的作用机理进行研究。结果表明:片状纳米勃姆石的加入可以明显提高水泥浆体的早期力学性能,与空白组相比,当勃姆石掺量为0.5%(质量分数)时,水泥浆体的抗压强度最大可以提高42.8%;勃姆石的加入不仅可以提高水泥水化反应速率,促进水泥的早期水化,还可以减少有害毛细孔含量,优化孔结构,提高水泥浆体的致密程度,从而促进水泥早期强度的发展。该研究结果为改善水泥的力学性能提供了新的方法。

The addition of nanoparticles will affect the mechanical properties of materials.In this paper,flaky nano boehmite(FNB)was synthesized by the hydrothermal method in alkaline environment.The FNB was added to cement,and its influence on the mechanical properties of cement slurry was studied by hydration heat,X-ray diffraction,thermal analysis,nitrogen adsorption and scanning electron microscope.The results show that the addition of FNB obviously improves the early mechanical properties of cement paste,and when the content of FNB is 0.5%(mass fraction),the compressive strength of cement paste is increased by 42.8%to the maximum compared with the blank group.The addition of FNB can not only improve the hydration reaction rate of cement and promote the early hydration of cement,but also reduce the content of harmful pores,optimize the pore structure and improve the compactness of cement paste,thus promoting the development of early strength of cement.The research results provide a new method to improve the mechanical properties of cement paste.