What Are the Raw Materials of UHPC? An In-Depth Analysis of the Qinglong UHPC Material System

UHPC's superior performance stems from its precise raw material system. It mainly comprises five major categories: cementitious materials, reinforcing fibers, aggregates, chemical admixtures, and mineral admixtures. Each material must meet strict technical specifications.

In terms of raw material proportions, Qinglong UHPC adopts a scientific system: Grade 52.5 low-alkali cement (25%-30%) provides the strength foundation; silica fume (8%-12%) fills micropores; quartz sand (35%-45%) forms the skeleton; steel fibers (2%-3%) enhance toughness; polycarboxylate superplasticizer (2%-3%) improves workability. This precise proportioning achieves a compressive strength of 120-150MPa and a flexural strength of 18-25MPa.

Cementitious Material System

Uses Grade 52.5 low-alkali sulphoaluminate cement with an alkali content ≤0.6%. Combined with silica fume, fly ash, and other admixtures to optimize performance. Specific surface area and setting time are strictly controlled.

Reinforcing Fiber Selection

Copper-plated steel fibers with a tensile strength ≥2000MPa are used. Fiber length is 12-13mm and diameter is 0.18-0.20mm. The surface is specially treated to improve bond strength.

Aggregate Gradation Optimization

Selected quartz sand with a maximum particle size ≤0.6mm. Fineness modulus of 1.8-2.2 and clay content ≤0.3%. Through gradation optimization, the densest packing is achieved.

Chemical Admixture System

Polycarboxylate superplasticizer with a water reduction rate ≥35%. Retarding components adjust the setting time. Defoamers control the air content to ≤2%. These admixtures precisely regulate performance.

Raw material quality determines product performance. Qinglong UHPC has established strict supplier auditing and incoming inspection systems; every batch of raw materials must pass 28 indicator tests to ensure stable and reliable product performance.