UHPC Raw Material Composition Explained — Qinglong's Strict UHPC Raw Material Selection Standards

The raw material composition of UHPC (Ultra-High Performance Concrete) mainly includes five major categories: cementitious materials, aggregates, fibers, chemical admixtures, and water. Qinglong UHPC uses premium raw materials: P·II 52.5 grade Portland cement (C₃S content ≥55%), silica fume (SiO₂ content ≥92%), quartz sand (continuous grading, particle size 0.1-0.6mm), copper-plated micro steel fibers (diameter 0.15-0.20mm, length 12-13mm), and polycarboxylate high-range water reducer (water reduction rate ≥35%), achieving compressive strength of 120-150MPa and durability exceeding 100 years through precise proportioning.

Raw material proportion optimization: total cementitious materials 800-1000kg/m³, water-binder ratio 0.16-0.20, steel fiber volume fraction 2-3%, silica fume content 10-15%, quartz sand dosage 900-1100kg/m³. A national key project adopted Qinglong UHPC, with all raw materials tested against 32 indicators to ensure stable and reliable product performance.

Cementitious Material System

Cement: P·II 52.5 grade, high strength, good flowability; silica fume: filling effect and pozzolanic effect, improving density; mineral powder: improves workability and durability; other supplementary materials: selected according to performance requirements. Cementitious materials are the foundation of strength.

Aggregate Selection Criteria

Quartz sand: high hardness, reasonable grading, maximum particle size ≤0.6mm; other aggregates: selected according to needs, such as ceramic sand, emery, etc.; grading optimization: achieves the densest packing to improve strength. Quality aggregates enhance performance.

Fiber Reinforcement Materials

Steel fibers: improve toughness and crack resistance, diameter 0.15-0.20mm; other fibers: such as PVA fibers, PP fibers, etc.; fiber parameters: length, aspect ratio, shape, etc. affect the reinforcement effect. Scientific fiber selection is critical.

Chemical Admixtures

High-range water reducers: reduce water-binder ratio, improve flowability; other admixtures: such as retarders, early strength agents, etc.; admixture compatibility: good adaptation with cement, avoiding adverse reactions. Admixtures optimize workability.

Quality raw materials are the foundation of quality products. Qinglong UHPC strictly controls its raw materials to ensure outstanding product performance.