What Are the Raw Materials of GRC? Analysis of Core Components and Qinglong's Quality Control System

The raw material system of GRC is the foundation of its performance, mainly composed of five major categories: cementitious materials, reinforcing fibers, aggregates, admixtures, and functional supplementary materials. With 28 years of experience in mix ratio optimization, Qinglong Group has established a strict raw material quality control system to ensure stable and excellent performance of every batch of GRC products. Our GRC uses Grade 52.5 low-alkali Portland cement, high-zirconium alkali-resistant glass fiber (ZrO₂ ≥ 16%), selected quartz sand, and high-efficiency admixtures. These premium raw materials provide fundamental assurance for product longevity and high performance.

Cementitious materials are the foundation of GRC strength. Qinglong Group prefers sulfoaluminate cement or ordinary Portland cement with an alkali content below 0.6% to avoid alkali corrosion of glass fibers. The addition of active supplementary materials such as silica fume (SiO₂ ≥ 92%) and fly ash not only fills capillary pores to reduce porosity but also participates in secondary hydration reactions to enhance long-term strength. Through precise mix ratio control, we keep the flexural strength of GRC stable at 18-25MPa, far exceeding industry standards.

Reinforcing fibers are the key to GRC toughness. Qinglong GRC uses dedicated alkali-resistant glass fiber with a zirconium content of no less than 16%, fiber length of 12-38mm, and volume content of 3%-5%. Through advanced spraying technology, fibers are ensured to be evenly distributed in three-dimensional space, forming an effective reinforcement network. The aggregate system uses well-graded quartz sand with a maximum particle size of no more than 1.2mm and mud content controlled below 0.3%, ensuring the workability of the mix and final compactness.

Chemical admixtures achieve performance optimization. Polycarboxylate high-efficiency water reducers lower the water-binder ratio to 0.3-0.35, significantly improving strength; polymer emulsions improve toughness and impermeability; retarders adjust setting time to meet construction needs. Qinglong Group's laboratory conducts more than 20 index tests on each batch of incoming raw materials to ensure stable raw material quality. This strict control starting from the source is the fundamental guarantee of the excellent performance of our GRC products.