Study on the Static and Dynamic Mechanical Behavior of Ultra-High Performance Concrete with Ferrochrome Slag

抄録

The utilization of industrial solid waste presents a viable approach to supplementing the consumption of natural sand and gravel resources, thereby alleviating resources pressure and reducing environmental burden. Ferrochrome slag (FCS), known for its excellent mechanical properties, has garnered significant interest as a potential substitute for conventional sand and gravel aggregates. To maximize the value of ferrochrome slag, FCS was used as fine aggregate to prepare ultra-high performance concrete (UHPC) with excellent properties in this paper. The effects of aggregate substitution rate and fiber content on the static and dynamic mechanical properties of UHPC were systematically investigated, and the evolution of dynamic damage was further validated through numerical simulation. Moreover, the underlying mechanisms for performance enhancement were elucidated using multiple microstructural characterization techniques. Results indicate that the incorporation of FCS significantly improves both the static and dynamic mechanical properties of UHPC. Microscopic analyses confirm that the addition of FCS reduces porosity and enhances the interfacial bonding between the matrix and the aggregate. This study offers novel insights into aggregate selection for UHPC and provides theoretical and technical support for the application of ferrochrome slag in UHPC.