纳米氧化石墨烯对水泥复合材料中水化晶体结构的控制及增韧作用  

Regulation of grapheme oxide on microstructure of hydration crystals of cement composites and its impact on reinforcing toughenss

作　　者：吕生华[1] 孙婷[1] 马宇娟[1] 邱超超[1] 丁怀东[1] 刘晶晶[1] 

机构地区：[1]陕西科技大学资源与环境学院,陕西西安710021

出　　处：《混凝土》2013年第11期1-6,共6页Concrete

基　　金：国家自然科学基金资助项目(21276152)

摘　　要：通过氧化反应和超声波分散作用制备了含氧量19.31%、25.43%和31.78%的氧化石墨烯(GO)纳米分散液,研究了GO对水泥复合材料微观结构和力学性能的影响。研究结果表明含氧量为25.43%的GO能够调控水泥水化反应形成规整的花朵状晶体,使得水泥基复合材料的强度特别是拉伸强度和抗折强度显著的提高。提出了GO调控水泥水化产物微观结构的作用机理,认为GO在水泥水化过程起到模板作用具有组装效果,能够调控水泥水化晶体的微观结构。提供了可显著提高水泥浆体韧性的新方法,具有潜在的应用前景。Graphene oxides （ GO ） with oxygen content of 19.31%, 25.43 % and 31.18% were prepared by oxidization and ultrasonic dis- persion.The effect of GO of microstructure of cement paste and mechanical properties of cement composites were investigated.The results indicated that GO with oxygen content of 25.43% could regulate formation of flower-like hydration crystals and increase remarkably the tensile and folding strength of the corresponding cement composites.A possible mechanism of GO mediated formation of flower-like crys-tals was also presented,and think that GO should had template role and seemble effect in forming cement hydration crystals.The research result provided a new pathway to significantly improving the toughness of hardened cement paste and had significant practical applications.

关 键 词：氧化石墨烯 水泥基复合材料 微观结构 增韧作用 

分 类 号：TU528.01[建筑科学—建筑技术科学]