多层氧化石墨烯-水泥基复合材料的力学性能与微观结构

研究了大片径多层氧化石墨烯(Graphene Oxide,GO)对水泥砂浆力学性能和微观结构的影响。发现掺入多层GO对水泥砂浆的抗压强度和抗折强度增强效果明显。随着GO掺量的增加,水泥砂浆的抗压强度和抗折强度呈现出先增大后减小的趋势。通过SEM观察其微观结构,发现GO作为载体,促使花状晶体和针状晶体等水化产物的生成,并且调节水泥的水化产物规则生长,形成致密结构。此外,GO纳米片可以形成阻止裂纹扩展的屏障,抑制裂纹在水泥砂浆中的传播,增强水泥砂浆的力学性能。相比于小片径薄层GO,大片径多层GO对水泥基材料性能的增强效果明显,经济实用性更高。

Mechanical properties and microstructure of multilayer graphene oxide-cement composites

Influence of large diameter Graphene oxide(GO)on the mechanical properties and microstructure of cement mortar is studied.It is found that the doping of GO results in a significant increase in the compressive strength and flexural strength of the cement mortar.With the increase of GO content,the compressive strength and flexural strength of mortar show a trend of increase firstly and then decrease.Because GO acts as a carrier,it promotes the regular growth of cement hydration products and forms a dense structure.In addition,GO nanosheets can form barriers to prevent crack propagation,the propagation of cracks in cement mortar is inhibited,and the mechanical properties of cement mortar are enhanced.Compared with the small-diameter GO,the large-diameter multi-layer GO significantly enhances the performance of the cement-based material,but it is more economical and practical.This work provides a guide for improving the performance of cement-based composites.