What raw materials make up UHPC, and what are the approximate proportions of each component?

The raw material composition of UHPC is precise and complex, with each component proportioned at specific ratios to jointly endow the material with ultra-high performance. The raw materials of typical UHPC mainly include four major categories: cementitious materials, aggregates, fibers, and admixtures.

In the Shenzhen Yirui Biotechnology Building project, the typical mix proportion of Qinglong UHPC is: cementitious materials (cement + silica fume + mineral powder) 35%, aggregates (quartz sand) 40%, steel fibers 2.5%, chemical admixtures 2.5%, with a water-binder ratio of 0.18. This proportion gives the material a compressive strength of 135MPa and good workability.

Cementitious Material System

Cement 25%-30%, silica fume 8%-12%, mineral powder 5%-8%. The multi-component cementitious system jointly contributes to strength development through physical and chemical actions.

Aggregate System

Quartz sand 35%-45%, maximum particle size ≤0.6mm. Optimized gradation achieves the densest packing and reduces porosity.

Fiber Reinforcement Materials

Steel fibers 2%-3% (by volume), aspect ratio 60-80. Through bridging action, fibers significantly improve the material's toughness and crack resistance.

Chemical Admixtures

High-range water reducers 2%-3%, other functional admixtures 0.5%-1%. This ensures good workability even at low water-binder ratios.

The proportions of each component need to be adjusted according to specific performance requirements, with the optimal mix proportion determined through experimental optimization.