氧化石墨烯对水泥基复合材料微观结构的调控机制及与性能的相关性

项目名称： 氧化石墨烯对水泥基复合材料微观结构的调控机制及与性能的相关性

项目编号： No.21276152

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 化学工业

项目作者： 吕生华

作者单位： 陕西科技大学

项目金额： 80万元

中文摘要： 目前高性能水泥基复合材料（HPC）存在的主要问题是韧性差、容易裂缝和渗透，国内外解决的主要方法是用高性能纤维进行增强增韧，但是裂缝渗透的问题依然存在。申请者在前期研究的基础上，提出了利用氧化石墨烯（GO）的高强度和高柔韧性以及对混凝土微观结构的调控作用，显著提高混凝土的性能特别是韧性和抗裂缝的性能。通过研究GO对水泥水化产物的组成与形状、集料与凝胶体间过渡层结构、孔结构及对性能的影响，揭示GO对HPC的微观结构及性能特别是韧性影响的规律。通过GO的可控氧化调控分散和功能化程度，提高GO调控HPC微观结构和性能的能力，揭示GO调控HPC结构的机理和规律，建立HPC微观结构与性能的关系。本项目创新之处是利用纳米GO对水泥水化产物组成和形状的调控作用改变水泥基复合材料的微观结构，显著提高HPC的力学性能特别是韧性及抗裂缝的能力，为通过调控混凝土的微观结构构筑理想性能的水泥基复合材料提供理论指导。

中文关键词： 氧化石墨烯；水泥基复合材料；规整微观结构；模板效应；增强增韧机理

英文摘要： At present, the main issues of high performance cement based composites（HPC） is poor toughness and producing cracking and penetration easily. Now the major approach to resolve them at home and abroad is to enhance the intensity and toughness by adding high performance fibers in concrete. But the problems of high cracking and permeation problem still exists today. Based on the result of the previous studies, a new idea is proposed by applicant to reinforce the strength, especially reinforcing flexibility, by using the graphite oxide (GO) with high strength and high flexibility and modified microstructure of HPC by adjusting function of GO on concrete microstructure. The regulation and influence of GO on the microscopic structure and properties of HPC were investigated through studied of the composition proportion, size or shape of cement hydration products, the microstructure of its interface transition layers of aggregates and gel and the characteristic of pore structure. Meanwhile, the capacity to regulate the microstructure and properties of HPC was improved through the study of the relationship of controlled oxidation and controlled scattered and functional groups of GO. The mechanism and regulation of controlling of microstructure of HPC with GO was revealed and the relationship between the microstructure an

英文关键词： Graphene oxide；Cement composites；ordered microstructure；Template effects；Reinforcing and toughening mechanism