辅助性胶凝材料负载纳米碳纤维的优化设计及其与水泥基材料相互作用机理研究

项目名称： 辅助性胶凝材料负载纳米碳纤维的优化设计及其与水泥基材料相互作用机理研究

项目编号： No.51472090

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 李方贤

作者单位： 华南理工大学

项目金额： 80万元

中文摘要： 纳米碳纤维具有高比强度、高比模量、缺陷数量少、结构致密、长径比大等优异特性，是一种新型的水泥基增强材料，但纳米碳纤维的分散问题，以及缺乏对纳米碳纤维与水泥基材料相互作用机理研究，限制了其在水泥基材料中应用和增强效果发挥。本项目从纳米碳纤维生产工艺出发，以辅助性胶凝材料为基质，采用原位合成方式制备纳米碳纤维，使纳米碳纤维分散在辅助性胶凝材料中，形成辅助性胶凝材料负载纳米碳纤维复合材料；系统研究辅助性胶凝材料负载纳米碳纤维原位合成方式、合成条件、结构参数、微观形态以及结构调控方法。探明辅助性胶凝材料负载纳米碳纤维对Ca(OH)2、 C-S-H凝胶、钙矾石等水泥水化产物形成和生长行为的影响，揭示辅助性胶凝材料负载纳米碳纤维与水泥基材料相互作用的机制，明确水化产物组成和结构的变化对水泥基材料增强增韧的关联性。本项目的开展将为纳米碳纤维结构调控、推广纳米碳纤维在水泥基材料中的应用起到理论指导作用。

中文关键词： 纳米碳纤维；辅助性胶凝材料；原位合成；水化产物；水泥基材料

英文摘要： Nano-carbon fiber is a new reinforced cement-based materials, presenting a high specific strength and specific modulus, less defect, compact structure, large length-diameter ratio and etc. The application and reinforcing effect of nano-carbon fiber in cement-based materials are limited due to its poor dispersion property in cement-based materials and lack of investigation on the interaction mechanism of nano-carbon fiber and cement-based materials. In this project, a new approach by which nano-carbon fiber grows directly on the matrix surface and matrix precursor particles is proposed. Supplementary cementitious materials are selected as the precursor matrix. A novel supplementary cementitious materials supported nano-carbon fiber is synthesized in which nano-carbon fibers are attached to the supplementary cementitious materials. The in-situ synthesis method, synthesis conditions, structural parameters, micro-morphology, and structure control methods for supplementary cementitious materials supported nano-carbon fiber will be systematically investigated. The influence of supplementary cementitious materials supported nano-carbon fiber on the formation and growth behavior of hydration products (e.g. Ca(OH)2, C-S-H gel, Ettringite) will be explored to reveal the interaction mechanism between cement-based materials and supplementary cementitious materials supported nano-carbon fiber, the correlation between alterations of the composition and structure of the hydration products and enhancement effect of cement-based materials. This project will provide a theoretical basis for the adjustment and control of nano-carbon fiber structure and promote the application of nano-carbon fiber in cement-based materials.

英文关键词： Nano-carbon fiber;Supplementary Cementitious Materials;in-situ synthesis;hydration products;Cement-based Materials