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

The performance advantages of GRC products stem from their precise raw material system. It mainly comprises five major categories: cementitious materials, reinforcing materials, aggregates, chemical admixtures, and supplementary cementitious materials. Each material must meet strict technical specification requirements.

In the Shenzhen Yirui Biotechnology Building project, the raw material system used by Qinglong GRC is representative: Grade 52.5 low-alkali cement (alkali content ≤0.6%) provides the strength foundation; zirconia-type alkali-resistant glass fiber (ZrO₂ content ≥16.5%) delivers the reinforcing effect; selected quartz sand (fineness modulus 1.8-2.2) optimizes particle grading; polycarboxylate superplasticizer (water reduction rate ≥30%) improves workability; silica fume (SiO₂ ≥92%) enhances densification. This scientific mix proportion ensures the product's flexural strength reaches over 25MPa.

Cementitious Material System

Low-alkalinity sulphoaluminate cement is used, with alkali content ≤0.6%. It is combined with silica fume, fly ash, and other supplementary materials to optimize performance. Specific surface area and setting time are strictly controlled.

Reinforcing Fiber Selection

Zirconia-type alkali-resistant glass fiber is used, with ZrO₂ content ≥16.5%. Fiber length is 12-25mm, with a diameter of 10-20μm. The fiber surface is treated with coupling agents to improve bond strength.

Aggregate Grading Optimization

Selected quartz sand with mud content ≤0.3%. Maximum particle size ≤1.2mm, fineness modulus 1.8-2.2. Through grading optimization, the densest packing is achieved.

Chemical Admixture System

Polycarboxylate superplasticizer improves workability. Retarding components adjust setting time. Defoamers control air content. These admixtures precisely regulate performance.

The quality of raw materials determines product performance. It is recommended to select high-quality raw materials to ensure the long-term durability of GRC.