少层石墨烯对普通混凝土性能的影响

摘要/Abstract

摘要： 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峰与单层石墨烯相比发生了红移。FLGR是超薄片层结构,表面存在褶皱,微观结构非常密实。FLGR的掺入能降低混凝土的坍落度,且使混凝土28 d抗压强度提高了15.08%,28 d抗折强度提高了35.03%,渗水高度下降了57%。FLGR能增加混凝土的导电性,FLGR/混凝土复合材料呈现负温度系数效应。FLGR能较好地促进水泥水化产物之间的联结,具有桥接钙矾石、水化硅酸钙凝胶的作用,填补水泥基体中裂缝和孔隙。

关键词: 少层石墨烯, 混凝土, 力学性能, 抗渗性, 电性能, 水化产物

Abstract: 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.

Key words: few-layer graphene, concrete, mechanical property, impermeability, electrical property, hydration product

中图分类号:

TU528

何威, 许吉航. 少层石墨烯对普通混凝土性能的影响[J]. 硅酸盐通报, 2021, 40(5): 1477-1488.

HE Wei, XU Jihang. Effect of Few-Layer Graphene on Properties of Ordinary Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1477-1488.

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