What raw materials is UHPC mainly composed of, and what are the approximate proportions of each component?

The exceptional performance of UHPC stems from its precise raw material proportioning system. Based on 28 years of production experience, Qinglong Group categorizes UHPC raw materials into five major classes: cementitious materials, aggregates, fibers, admixtures, and water, with each component scientifically proportioned to achieve optimal material performance. This precise proportioning control is the key to ensuring stable UHPC performance.

Cementitious materials are the foundation of UHPC, typically accounting for 25%-35% of the total mass. Cement accounts for 20%-30%, while mineral admixtures such as silica fume account for 5%-10%. In high-end projects, Qinglong Group uses Grade 52.5 Portland cement to ensure early strength development, while incorporating 10% silica fume to fill the gaps between cement particles and improve matrix density. In the Wuhan Hanxiu Theater project, this cementitious material proportion enabled UHPC to achieve a 3-day compressive strength of over 80MPa.

The aggregate system accounts for 40%-50% of the total mass, with quartz sand accounting for 35%-45% and fillers such as quartz powder accounting for 5%-10%. The maximum particle size of aggregates usually does not exceed 1mm in order to achieve dense packing. By optimizing aggregate gradation, Qinglong Group raised the maximum packing density to above 0.68, significantly improving the mechanical properties of the material. In the Hainan International Convention and Exhibition Center project, this aggregate proportion ensured the durability of the UHPC roof panels.

Fibers are the key reinforcement materials in UHPC, generally added at a volume fraction of 2%-3%. Steel fibers are the most commonly used fiber type, with a diameter of 0.15-0.25mm and a length of 12-20mm. In critical projects, Qinglong Group uses copper-plated steel fibers with a tensile strength exceeding 2500MPa to ensure effective reinforcement. Uniform fiber distribution is achieved through an optimized mixing process, preventing fiber clumping.

Although admixtures and water are used in small amounts, they are crucial for adjusting workability. High-range water reducers account for 0.5%-1.5%, and the water-binder ratio is controlled between 0.18 and 0.22. Through precise admixture compounding technology, Qinglong Group maintains good workability even at low water-binder ratios. This scientific raw material proportioning system provides a reliable guarantee for the excellent performance of UHPC.