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

The raw material system of UHPC and its mix proportions directly determine the performance of the final product. Through 28 years of mix optimization, Qinglong Group has categorized the raw materials of UHPC into five major categories: cementitious materials, aggregates, fibers, admixtures, and water, with each component achieving synergistic effects through precise proportioning.

Cementitious materials are the foundation of UHPC, accounting for 25%-35% of the total mass. Among them, grade 52.5 cement accounts for 20%-30%, and active mineral admixtures such as silica fume account for 5%-10%. Qinglong Group uses white cement in high-end projects, with its C3A content controlled below 8% to ensure volume stability. The addition of silica fume effectively fills the gaps between cement particles and improves matrix density.

The aggregate system accounts for 40%-50% of the total mass, of which quartz sand accounts for 35%-45% and fillers account for 5%-10%. The maximum particle size of aggregates does not exceed 1mm, and continuous gradation is adopted to ensure tight packing. By optimizing aggregate gradation, Qinglong Group has increased the maximum packing density to above 0.68, significantly improving the mechanical properties of the material.

Fibers are the key reinforcing materials of UHPC, with a volume dosage generally of 2%-3%. Copper-plated steel fibers are preferred, with a diameter of 0.15-0.25mm and a length of 12-20mm. Qinglong Group ensures uniform fiber distribution through robotic spraying, with fiber tensile strength of no less than 2000MPa. This reinforcement system gives UHPC excellent toughness and impact resistance.