Ultra‐high‐strength Concrete

This chapter provides an overview of various ultra-high-strength concrete materials, including macro-defect-free cement (MDF), densified systems of homogeneously arranged ultra-fine particles (DSP), compact reinforced composites (CRCs) and reactive powder concrete (RPC). It discusses their formulation principles, preparation processes, performance, and prospects for development and application. The chapter also explores the reinforcement mechanisms of ultra-high-strength cementitious composites with low water-binder ratios, focusing on the roles of polymers, fibers, and ultra-fine particles in enhancing material properties. The importance of interfacial composite enhancement mechanisms, such as the synthesis of water-soluble polymers, interface-chemical interactions, and optimization of material composition and structure, is highlighted. The chapter emphasizes the significance of physical effects, physicochemical effects, and chemical effects in the formation of ultra-high-strength concrete materials with dense, defect-free macrostructures and interlacing microstructural networks.