少层石墨烯对普通混凝土性能的影响

为了深入研究石墨烯/混凝土复合材料,系统研究了少层石墨烯(FLGR)对普通混凝土坍落度、力学性能、抗渗性及电性能的影响,且通过扫描电子显微镜(SEM)分析了FLGR/混凝土复合材料的微观形貌,同时利用原子力显微镜(AFM)、Raman、SEM表征了FLGR.结果表明,FLGR的层数在3～6层,其D峰和G峰与单层石墨烯相...

Effect of Few-Layer Graphene on Properties of Ordinary Concrete

To further study graphene/concrete composites, the effect of few-layer graphene (FLGR) on the slump, mechanical properties, impermeability and electrical properties of ordinary concrete was systematically studied, and SEM was used to analyze the microstructure of FLGR/concrete composites. Meanwhile, AFM, Raman and SEM were used to characterize FLGR. The results show that the layer number of FLGR is between 3 layers and 6 layers, and the D and G peaks of FLGR are red-shifted compared with that of monolayer graphene. FLGR is an ultra-thin lamellar structure with wrinkles on the surface and it has a very tight microstructure. The addition of FLGR reduces the slump of concrete, and 28 d compressive strength of concrete increases by 15.08%, 28 d flexural strength increases by 35.03%, the height of penetration decreases by 57%. FLGR has the function of increasing the conductivity of concrete, and FLGR/concrete composites present negative temperature coefficient effect. FLGR can better promote the connection between hydration products, act the part of bridging ettringite and C-S-H gel to fill cracks and pores in cement matrix.