Scientific Raw Material Proportioning System of UHPC — Qinglong UHPC Material Technology Analysis

The raw material system of UHPC (Ultra-High Performance Concrete) involves the precise proportioning of cementitious materials, reinforcing fibers, aggregates, chemical additives, and water. Premium UHPC uses raw materials such as Grade 52.5 Portland cement (20-25%), silica fume (5-10%), quartz sand (maximum particle size 0.6mm), steel fibers (volume fraction 2-3%), and high-range water reducers (water reduction rate ≥30%), achieving a water-binder ratio of 0.18-0.22 through maximum packing density theory. Through precise raw material selection and mix proportion optimization, Qinglong UHPC achieves a compressive strength of 120-150MPa, delivering outstanding performance.

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 mud content ≤0.5% with continuous gradation; steel fiber tensile strength ≥2000MPa, aspect ratio 60-80. Qinglong UHPC has established a strict supplier management system to ensure stable and reliable raw material quality, with a product performance coefficient of variation ≤5%.

Cementitious Material System

A composite system of ordinary Portland cement and active mineral admixtures produces highly dense hydration products; the filling effect and pozzolanic effect of silica fume are significant, improving matrix density; mineral powder improves workability and reduces hydration heat; scientific proportioning delivers synergistic reinforcement effects. Cementitious materials are the foundation of performance.

Aggregate Gradation Optimization

The maximum particle size of quartz sand is controlled within 0.6mm, achieving optimized continuous gradation; particle shape is close to spherical, reducing water demand; mud content and harmful substance content are strictly controlled; through maximum packing density theory, porosity is minimized. Aggregate optimization enhances performance.

Fiber Reinforcement Technology

Steel fibers have a diameter of 0.15-0.20mm, a length of 12-13mm, and an aspect ratio of 60-80; fibers are uniformly dispersed with no clumping; high bond strength with the matrix effectively transfers stress; through fiber orientation distribution technology, reinforcement efficiency is increased by 20%. Fiber reinforcement significantly improves toughness.

Chemical Admixture Compounding

Polycarboxylate water reducers achieve a water reduction rate ≥30%, ensuring a low water-binder ratio; defoamers control air content ≤3%; retarders, early-strength agents, and other functional additives are added when necessary; scientific compounding improves workability and durability. Admixture optimization enhances overall performance.

Premium raw materials are the foundation of UHPC's high performance. Qinglong UHPC strictly controls raw material quality to ensure outstanding product performance.