水泥基材料界面微结构与细-宏观性能关系多尺度研究

项目名称： 水泥基材料界面微结构与细-宏观性能关系多尺度研究

项目编号： No.51479011

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 水利工程

项目作者： 石妍

作者单位： 长江水利委员会长江科学院

项目金额： 84万元

中文摘要： 鉴于测试手段与分析方法的局限，水泥基材料界面微结构对宏观性能整体行为的影响未能全面解析。项目采用高分辨NMR、FTIR、XRD、SAXS等水泥基材料微观测试手段，定量表征界面C-S-H微结构及含量，明确C-S-H结构、CH取向性和孔隙率的关系及影响机制，科学表达界面低尺度信息。结合显微硬度、纳米压痕方法，探明界面力学参数与微结构参数的关系，阐明界面力学特性在微观层次的影响机制；基于CT技术，实时追踪不同界面特性试件的内部损伤演变过程，细观动态揭示承压下破损全过程的损伤裂纹演变规律。贯穿界面结构-界面性能-细观动态-宏观表现的研究路径，掌握界面力学指标与材料细-宏观性能的关系，建立界面微结构参数与材料细-宏观性能的多尺度模型。旨在解析微观界面影响细观乃至混凝土宏观表现的内在本质，丰富水泥基材料多尺度研究基础，拓展改善混凝土性能的新途径。

中文关键词： 水泥基材料；界面微结构；细观性能；宏观性能；多尺度

英文摘要： Given some limitations, the impact of interfacial microstructure on macroscopic properties of cement-based materials is not fully resolved. Testing methods of NMR, FTIR, XRD and SAXS were used to quantitatively characterize microstructure and content of C-S-H at interface region, and define impact mechanism and relationships between C-S-H structure, CH orientation and porosity, thus scientifically express the low-scale information. The relationships between mechanics and microstructure, and impact mechanism of mechanical properties at micro-level would be clarified by microhardness and nanoindentation. Based on CT technology, internal damage evolution under pressure can be real-time track and dynamically reveal in mesoscopic. Through the research path of interface structure, interface performance, mesoscopic dynamics and macro properties, aim to grasp the relationship between mechanical index of interface and meso-macroscopic properties of materials, establish multi-scale model of interface microstructure parameters and material properties. Study hase significance in resolve the inherent nature of micro-interface impact on meso and macro properties of concrete, rich multi-scale research and develop new ways to improve the performance of concrete.

英文关键词： cement-based materials;microstructure of interface;mesoscopic properties;macroscopic properties;multi-scale