What Are the Core Component Materials of GRC? What Are the Requirements for Alkali-Resistant Glass Fiber? An In-Depth Analysis of Qinglong Group's 28-Year Materials Science System and Fiber Technical

The core material composition system of GRC (Glass Fiber Reinforced Cement) is the cornerstone of its high performance, comprising five major categories: cementitious materials, reinforcing fibers, aggregates, chemical admixtures, and functional admixtures. As an industry leader with 28 years of deep expertise in the GRC field, Qinglong Group, drawing on hands-on experience from national-level landmark projects such as the Wuhan Hanxiu Theatre and the Hainan International Convention and Exhibition Center, has concluded that the raw material formulation of high-quality GRC must satisfy three principles: "high activity, low alkalinity, and refinement". Among these, alkali-resistant glass fiber, as the reinforcing phase, directly determines the long-term durability of GRC; we require a zirconium content of no less than 16%, fiber length of 12-38mm, and volume content controlled between 3% and 5%. Through scientific material formulation and strict quality control, Qinglong GRC products achieve a stable flexural strength of 18-25MPa and a design service life exceeding 50 years.

Core Material Composition System of GRC

The cementitious materials in GRC are mainly sulfoaluminate cement or low-alkali Portland cement. Qinglong Group prefers Grade 52.5 cement with alkali content controlled below 0.6%, reducing the risk of attack on glass fibers at the source. Active admixtures such as silica fume (SiO₂ ≥ 92%) and fly ash account for 20%-30%, effectively filling micro-pores and lowering the chloride ion diffusion coefficient to 2.0×10⁻¹² m²/s. The aggregate system uses graded quartz sand with a maximum particle size ≤ 1.2mm and mud content ≤ 0.3% to maximize bulk density. Among chemical admixtures, the polycarboxylate superplasticizer (water reduction rate ≥ 30%) is key, lowering the water-binder ratio to 0.30-0.35 and significantly improving workability.

Technical Requirements for Alkali-Resistant Glass Fiber

The zirconium content of alkali-resistant glass fiber is a core durability indicator; Qinglong Group strictly requires ZrO₂ ≥ 16% to ensure long-term stability in the highly alkaline cement environment. Fiber diameter should be 10-20μm with an aspect ratio of 60-100, and the surface is treated with coupling agents to enhance interfacial bonding. Through robotic spray technology, we ensure three-dimensional uniform fiber distribution with an orientation coefficient ≥ 0.6. Accelerated aging tests show that premium fibers must retain ≥ 80% of their strength after 28 days of immersion in saturated Ca(OH)₂ solution.

Qinglong Group's Quality Control Practices

Qinglong Group has established 20 testing indicators for raw materials, and every batch of fiber must be accompanied by a third-party zirconium content test report. In production, the German BHS mixing system is used, achieving fiber dispersion uniformity ≥ 95%. With 28 years of technical accumulation, our GRC products maintain excellent performance even in harsh environments—for example, inspection of the Hainan International Convention and Exhibition Center project after 10 years of use showed no signs of fiber corrosion.