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

The raw material system of UHPC mainly comprises five categories: cementitious materials, reinforcing fibers, aggregates, chemical admixtures, and functional admixtures. The mix proportion of high-quality UHPC is precisely designed, with each component accounting for: cementitious materials 20%-25%, aggregates 35%-40%, fibers 2%-3%, water-binder ratio 0.18-0.22, and chemical admixtures 1%-2%.

Taking Qinglong UHPC's standard mix proportion as an example: Grade 52.5 low-alkali cement accounts for 18%, silica fume 8%, quartz sand 38%, steel fibers 2.5%, water-binder ratio 0.20, and polycarboxylate superplasticizer 1.2%. This proportion has been optimized through extensive testing to ensure optimal material performance. Scanning electron microscope observations show that under this proportion, fibers bond well with the matrix, porosity is as low as 2.8%, and the microstructure is dense and uniform.

Cementitious Material Composition System

Low-alkali cement accounts for 15%-20%; silica fume 5%-8%; other admixtures 2%-4%. These materials form the strength foundation.

Aggregate Gradation Optimization

Quartz sand accounts for 35%-40%; maximum particle size ≤0.6mm; fineness modulus 1.8-2.2. These controls ensure dense packing.

Fiber Reinforcement System

Steel fiber volume content 2%-3%; aspect ratio 60-80; tensile strength ≥2850MPa. These parameters ensure the reinforcement effect.

Chemical Admixture Proportioning

High-range water reducer accounts for 0.8%-1.2%; other functional admixtures 0.2%-0.5%. These improve workability.

Scientific proportioning is the guarantee of performance. Raw material quality and proportioning accuracy directly affect product performance. Through precise proportioning control, Qinglong UHPC ensures stable product performance.