纤维在自密实混凝土中的应用近年来引起了国内外学者的广泛关注。目前，国际上暂无自密实混凝土尺寸稳定性规范，收缩、徐变性能研究成为亟待解决的关键性问题。本项目结合自密实混凝土技术特点及不同纤维材料特性，采用材料微观测试及物化分析方法，研究自密实混凝土与不同纤维作用下材料微观变形过程、混凝土硬化变形规律，分析纤维与水泥石间界面结构特征，确立纤维增韧抗裂机理。同时，对收缩、徐变性能进行系统实验研究，阐明纤维自密实混凝土组成、微观结构与尺寸变形之间的相互关系原理，揭示配合比参数对自收缩、干燥收缩以及受压徐变的影响规律，建立收缩、徐变预测模型，制定混凝土体积变化抑制对策，提出有变形抑制作用的纤维自密实混凝土优化设计方法，从混凝土微观结构变形机理出发进而建立其与宏观尺寸变形性能的逻辑关系。本项目具有广泛的理论研究价值及巨大工程实用性，对于国际自密实混凝土硬化性能规范的修订具有极其重要的学术价值。

The addition of fibers to self-consolidating concrete (SCC) attracts extensive attention of many researchers. At present, there are no worldwide codes or specifications for visco-elastic properties of SCC, therefore, the study of creep and shrinkage behaviors became a critical issue to be solved. In this investigation, according to the characteristics of different fibers and the SCC technologies, the process of micro-deformation and the deformation mechanism of SCC incorporates with various fibers will be studied based on the micro- and physic-chemical analysis methods. The structural characterizations of interfacial zone between fibers and hardened cement paste will be analyzed, and the anti-cracking and tenacity increasing mechanism will then be established. The creep and shrinkage behaviors will also be investigated in order to clarify the relationship between the mixture proportioning and the micro structural deformation. The influences of concrete mix design parameters on autogenous shrinkage, drying shrinkage, and creep in compression will then be revealed. The creep and shrinkage prediction models will be proposed and the anti- volume changing measures will also be established. The fiber reinforced SCC (FRSCC) mix design methods will be proposed. Furthermore, the investigation will establish a logical relationship between micro-perspective study on deformation mechanism and macro-performance evaluation on volume changing. This project has important theoretical value and practical meaning, and it will has great contributions on updating the hardened properties, especially for visco-elastic properties of SCC worldwide specifications.