球磨法——一种制备氧化石墨烯改性水泥基材料的可替代性分散方法（英文）

A ball milling strategy to disperse graphene oxide in cement composites

氧化石墨烯的分散性对水泥基材料的性能有着重要的影响。目前,最普遍的分散方法是利用超声和分散剂先将氧化石墨烯分散在水中,进而与水泥颗粒搅拌成型。本文介绍了一种球磨的策略来改进氧化石墨烯在水泥基体中的分散性。分散的过程是将氧化石墨烯、水泥熟料和二水石膏在行星磨中进行研磨混合。结果表明:氧化石墨烯改性的水泥浆体抗压强度提高。球磨过程对氧化石墨烯的形貌影响不大,但引入了很多的缺陷。氧化石墨烯可以加速水泥水化,细化水泥石的孔结构。球磨法可以作为一种制备氧化石墨烯改性水泥基材料的新方法。

Ball milling was used to improve the dispersion of GO in a cement matrix in a planetary ball mill. Results indicated that the process had a negligible effect on the morphology of the GO but led to a 6.8% increase of the number of defects it contained. By adding 0.03 wt.% GO to the cement paste, its compressive strength increased by 9%, and the heat of hydration was increased 28%. The addition of GO accelerated the cement hydration, and decreased the porosity and pore size of the resulting cement paste, which were ascribed to the defects developed during ball milling and the functional groups on the GO that acted as nucleation sites for crystal growth during hydration. Ball milling provided an alternative method for the fabrication of GO-reinforced cement-based composites.