Research Progress on Material Properties of Ultra-high Performance Concrete Modified by Nano-materials

Nano-modified ultra-high performance concrete (UHPC) exhibits excellent material properties. To gain a more systematic understanding of nano-modified UHPC, this paper reviews the effects of organic nanomaterials, inorganic nanomaterials, and metallic nanomaterials on the material properties of UHPC. The characteristics and types of nanomaterials are introduced, and the mechanisms by which nanomaterials enhance UHPC performance are elucidated from the perspectives of small-size filling effect, surface nucleation effect, pinning effect, and pozzolanic effect. The research progress on the static and dynamic mechanical properties and durability of nano-modified UHPC, both domestically and internationally, is summarized. Researchers have conducted experimental studies and model analyses on material properties, and related technologies of nano-modified UHPC have been improved to a certain extent. However, there remain many influencing factors and uncertainties in practical research, and no complete system has been established. How to apply nano-modified UHPC to large-scale concrete structures in line with actual engineering needs while improving material economy still faces certain limitations and technical challenges. In the future, it is necessary to develop convenient methods for testing and data processing of various nano material modified UHPC materials, in order to optimize and improve the performance of composite materials.