Key Points of Production Process and Quality Control for High-Strength GRC Panels

In the field of architectural decorative materials, GRC (Glass Fiber Reinforced Concrete) has become an ideal choice for landmark buildings and high-end projects thanks to its lightweight, high-strength nature and flexible shaping. However, the complexity of its production process and the stringency of its quality control determine the performance and safety of the final product. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group provides an in-depth analysis of the core production essentials of high-strength GRC panels—from material mix proportions and mold craftsmanship to forming and curing—offering the industry practical, implementable quality control solutions.

I. Material Science: The Performance Foundation of High-Strength GRC Panels

The core advantage of high-strength GRC panels stems from scientific material mix proportions. In production, Qinglong strictly follows the golden combination of "cement-based materials + alkali-resistant glass fiber + mineral admixtures," in which the alkali-resistant glass fiber content must be precisely controlled at 3%-5% to ensure a flexural strength of over 20MPa, while optimization with mineral admixtures such as silica fume and fly ash enhances the material's durability and crack resistance. Compared with ordinary GRC, high-strength GRC panels have a 15% lower density and 30% higher impact resistance—a technological breakthrough that gives them outstanding application potential in large-span curtain walls and irregular-shaped components.

II. Mold Craftsmanship: The Precision Guarantee of Customized Production

The mold is the "skeleton" of GRC panel forming, and its precision directly determines product quality. Qinglong employs 3D scanning and parametric design technologies to achieve digital machining of complex-shaped molds, keeping mold tolerances within ±0.5mm. For hyperbolic components in projects such as grand theaters and museums, flexible silicone molds are used innovatively in combination with a vacuum infusion process, ensuring texture detail reproduction of over 98%. In addition, imported release agents are applied to the mold surface, which not only guarantees a smooth product surface but also extends mold service life and reduces production costs.

III. Forming and Curing: Key Stages for Strength and Stability

The forming of high-strength GRC panels involves three major steps: "spray forming—vacuum dewatering—steam curing." Qinglong's independently developed high-pressure spray system achieves uniform mixing of fiber and mortar, preventing fiber agglomeration; the vacuum dewatering process reduces the water-cement ratio of components to below 0.35, significantly improving compactness; and staged steam curing (40°C pre-curing → 60°C constant temperature → natural cooling) ensures a complete hydration reaction, with the 28-day compressive strength stably exceeding 80MPa. Notably, the temperature and humidity gradient must be strictly controlled during curing to prevent micro-cracks caused by temperature differences between the interior and exterior.

IV. Quality Control: A Full-Process Traceable Quality Management System

As a National High-Tech Enterprise, Qinglong has established a full-process quality control system covering everything from raw material intake to finished product delivery. Each batch of glass fiber must pass alkali resistance testing (strength retention rate ≥75% after 28 days of immersion), while cement and admixtures must comply with the "GRC Decorative Products" (JC/T940-2022) standard. During production, RFID chip implantation technology provides each component with a unique identity, enabling traceability of key information such as the production team and curing records. Before leaving the factory, 12 indicators are tested, including flexural strength, impact resistance, and freeze-thaw cycling, to ensure a 100% product pass rate.

From material R&D to engineering implementation, improving the quality of high-strength GRC panels is inseparable from technological innovation and accumulated experience. Drawing on 28 years of industry expertise, Qinglong Group has integrated the philosophy of "meticulous attention to detail and the constant pursuit of excellence" into every production process. The Group has not only participated in formulating multiple industry standards, including the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)," but has also demonstrated the application value of high-strength GRC panels in the high-end construction sector through benchmark projects such as the Dongguan Women and Children's Activity Center and Century Plaza on Nanjing East Road. In the future, as demand for green buildings and personalized design grows, high-strength GRC panels will offer greater possibilities for architectural aesthetics and structural safety with even more outstanding performance.