基于受拉应力状态分析的纤维RPC微观结构研究

Microstructure research of fiber reactive powder concrete based on tensile stress state analysis

针对RPC材料的薄弱环节即受拉应力状态,60组不同纤维RPC的受拉力学性能实验及其相应的SEM实验表明,纤维对RPC的微观工作机理的影响并非全是正面的,纤维带来阻裂增韧作用的同时也影响了骨料之间协同工作,且未完全改善的界面过渡区变得连续平直,影响材料的密实度和均匀度。在分析微观形貌、晶体结构、物相组成基础上提出的纤维RPC细观结构模型可用于分析纤维RPC的微观工作机理,为拓展高效、环保型水泥基复合材料的应用提供理论依据。

In the weak link of fiber reactive powder concrete（ RPC） that is tensile stress state,60 sets tension performance experiments of fiber RPC and its corresponding SEM experiments show that（ 1） the influence of fiber to the microcosmic mechanism of RPC are not all positive;（ 2） crack resistance and toughening effects of fiber are accompanied by the affection of collaboration between aggregates at the same time;（ 3） the uncompletely improved interface transition zone have become continuous and straight,affecting the compactness and uniformity of material. The microstructure model of fiber RPC is also proposed based on the analysis of microstructure,crystal structure,phase composition,and the model can be used for the analysis of the microscopic mechanism of fiber RPC. It also provides a theoretical basis for the development and application of efficient and environmentally cement base composite materials.