Behavior of High Strength Concrete Composites Influenced by Interfacial Fracture Properties

本项目将研究砂浆-骨料界面对高强混凝土复合材料力学性能的作用。该项目的总体目标是通过研究由高强度砂浆和骨料系统组成的复合材料，建立控制高强度混凝土强度、刚度和延性的基本标准。重点将放在界面韧性对复合材料性能的作用上。基于断裂力学的室内实验和数值研究将对具有不同材料性能组合的高强度砂浆基质和骨料包裹体的混凝土模型进行实验和数值研究，并控制界面断裂特征。各种砂浆/骨料体系所需的界面断裂韧性数据将基于先前研究开发的方法进行评估。界面强度的变化，实现使用硅粉的控制量，将在参数研究的性质实施。该研究有望提供砂浆-骨料界面对高强度混凝土性能影响的基本知识，并对其高效、经济和安全的生产和使用产生直接影响。＊＊＊

9313062 Buyukozturk This project will investigate the role of mortar-aggregate interfaces on the mechanical behavior of high strength concrete composites. the general objective of the project is to establish the fundamental criteria governing the strength, stiffness and ductility of high strength concrete through studies of the material as a composite consisting of a high strength mortar and aggregate system. the emphasis will be on the role of interface toughness on the composite material behavior. Fracture mechanics based laboratory experiments and numerical studies will be performed on concrete models with high strength mortar matrix and aggregate inclusions having different material property combinations with controlled interface fracture characteristics. The required interface fracture toughness data for various mortar/aggregate systems will be assessed based on the approach developed through previous research. The variation of interface strength, achieved using controlled amounts of silica fume, will be implemented in the parametric studies for the properties. The research is expected to provide a fundamental knowledge of the effects of mortar-aggregate interfaces on high strength concrete behavior and to have a direct impact on its production and use in an efficient, economical, and sate manner. ***