UHPC材料設計與製程

Ultra-High Performance Concrete (UHPC) is a new type of high-tech cementbased materials with excellent mechanical properties, durability, and workability. The compressive strength of UHPC can be higher than 1,200 kgf/cm², and it has a remarkable crack-resistant ability. This paper reviews the theoretical principle, raw materials, mixture design, and manufacturing process of UHPC. Among them, reduction in porosity, improvement in microstructure, promotion in homogeneity, and increase in toughness are the four basic design principles of UHPC materials. Raw materials, manufacturing processes, and curing methods have a significant influence on the performance of UHPC. Partial replacement of cement with supplementary cementitious materials, such as fly ash and ground granulated blastfurnace slag, can significantly reduce material costs and in the meantime improve durability without compromising strength. Moreover, UHPC has enhanced microstructure integrity and mechanical properties through high-temperature curing. However, the complexity and high-energy consuming nature of the hightemperature curing restrain its practical application for UHPC. Therefore, standard manufacturing processes such as using supplementary cementitious materials and room temperature curing methods are the future tendency of UHPC.