纳米氧化石墨烯增强增韧水泥基复合材料的微观结构及作用机理  

Microstructure and mechanism of reinforced and toughened cement composites by nanographene oxide

作　　者：吕生华[1] 刘晶晶[1] 邱超超[1] 马宇娟[1] 周庆芳[1] 

机构地区：[1]陕西科技大学资源与环境学院,西安710021

出　　处：《功能材料》2014年第4期84-89,共6页Journal of Functional Materials

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不同含氧量氧化石墨烯(GO)纳米分散液,研究了GO氧含量、用量和水化时间对水泥基复合材料微观结构和力学性能的影响。研究结果表明GO能够调控水泥水化产物的形状,促使水泥水化反应形成规整的花状晶体,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提高。研究结果证实了GO在水泥复合材料水化过程中起到模板作用,能够调控水泥水化产物的微观结构及提高水泥基复合材料的韧性,同时提出了GO调控水泥基复合材料微观结构的作用机理。本文结果提供了一种可显著增强增韧水泥基复合材料的新方法,具有潜在的应用前景。Graphene oxides （GO） with different oxygen content were prepared by oxidization and ultrasonic dis- persion. The effect of oxygen content and dosage of GO and hydration time on microstructure and mechanical properties of cement composites were investigated. The results indicated that GO can regulate formation of flower-like hydration crystals and increase remarkably the tensile and folding strength of the corresponding ce- ment composites. The results suggested that GO has template role in forming cement hydration crystals, which can regulate the microstructure of cement hydration products and improve toughness of cement composites. A possible mechanism of GO mediated formation of flower-like crystals was also presented in this paper. The re- search result provides a new pathway to significantly improving the toughness of hardened cement paste and has significant practical applications.

关 键 词：氧化石墨烯 水泥复合材料 水化反应 微观结构 模板效应 

分 类 号：TU528.572[建筑科学—建筑技术科学]