What Are the Main Raw Materials of UHPC and Their Approximate Proportions? Formulation System and Optimized Mix Ratio with Qinglong Group

UHPC is mainly composed of five categories of raw materials: cementitious materials, aggregates, fibers, chemical admixtures, and functional admixtures. Its typical mix ratio ranges are: cementitious materials (cement + admixtures) 30-40%, aggregates 40-50%, fibers 2-3%, chemical admixtures 1-2%, and water-binder ratio 0.18-0.22. Through 28 years of mix ratio optimization practice, Qinglong Group has verified the optimal material composition in projects such as the Wuhan Hanxiu Theater and Hainan International Convention and Exhibition Center: Grade 52.5 low-alkali cement 20-25%, silica fume 10-15%, quartz sand 40-45%, steel fibers 2-2.5%, high-range water reducer 1-1.5%, with the water-binder ratio controlled at 0.20±0.02. This mix ratio keeps the product's compressive strength consistently above 150MPa, with durability exceeding 50 years.

The cementitious material system is the foundation of performance. We preferentially select sulfoaluminate cement or low-alkali Portland cement with alkali content ≤0.6% to reduce attack on fibers. Active admixtures such as silica fume account for 15-20%; their micro-filling effect and pozzolanic reaction significantly improve compactness. Aggregates use graded quartz sand with a maximum particle size ≤1mm, and continuous grading ensures a packing density ≥0.85. The fiber system uses high-strength steel fibers or synthetic fibers, 12-20mm in length and 0.2-0.3mm in diameter, at a volume fraction of 2-3%, forming a three-dimensional reinforcement network.

Chemical admixtures precisely regulate performance. Polycarboxylate high-range water reducers (water reduction rate ≥30%) achieve high fluidity at low water-binder ratios; when necessary, functional components such as retarders and defoamers are added. Qinglong Group optimizes the mix ratio through response surface methodology to maximize the synergistic effects of all components.

Raw material quality determines the product's upper limit. We have established a strict supplier audit system, testing each batch of raw materials against 20 indicators to ensure stable and reliable mix ratios. A scientific material composition is the fundamental guarantee of UHPC's outstanding performance.