What Are the Raw Materials of UHPC? Qinglong's Scientific UHPC Raw Material Proportioning System

The raw material composition of UHPC (Ultra-High Performance Concrete) mainly includes five major categories: cementitious materials, aggregates, fibers, chemical additives, and water. The cementitious materials use a composite system of 52.5 grade Portland cement (20%-25% by proportion) and silica fume (5%-10% by proportion); aggregates are graded quartz sand with a maximum particle size of ≤0.6mm; steel fibers have a volume content of 2%-3% and an aspect ratio of 60-80; chemical additives include polycarboxylate superplasticizer (water reduction rate ≥30%), defoamers, etc. The water-binder ratio is strictly controlled between 0.18-0.22. Through precise proportioning and optimization of raw materials, Qinglong UHPC achieves ultra-high performance with compressive strength of 120-150MPa and flexural strength of 15-25MPa.

Raw material quality control standards: cement 3-day strength ≥30MPa, 28-day strength ≥52.5MPa; silica fume SiO₂ content ≥92%, specific surface area ≥15000m²/kg; quartz sand SiO₂ content ≥99%, mud content ≤0.5%; steel fiber tensile strength ≥2000MPa, diameter 0.15-0.20mm. Qinglong UHPC has established a strict supplier management system to ensure stable and reliable raw material quality.

Cementitious Material System

Adopts a composite cementitious system of ordinary Portland cement + silica fume + mineral powder, with dense hydration products; the filling effect and pozzolanic effect of silica fume are significant, improving density; mineral powder improves workability and reduces hydration heat. Scientific proportioning creates synergistic effects.

Aggregate Gradation Optimization

Quartz sand has a maximum particle size of 0.6mm with continuous gradation, achieving the tightest packing; particle morphology is close to spherical, reducing water consumption; mud content and harmful substance content are strictly controlled. Optimized gradation improves performance.

Fiber Reinforcement Technology

Steel fibers have a diameter of 0.15-0.20mm, length of 12-13mm, and aspect ratio of 60-80; uniformly dispersed without clumping; high bond strength with the matrix, effectively transferring stress. Fiber reinforcement significantly improves toughness.

Chemical Additive Compounding

Polycarboxylate superplasticizer has a water reduction rate ≥30%, ensuring a low water-binder ratio; defoamers control air content ≤3%; retarders, early strength agents, etc. are added when necessary. Admixture optimization improves workability and performance.

High-quality raw materials are the foundation of UHPC performance. Qinglong UHPC exercises strict control to ensure excellent product performance.