Analysis of Key Points in High-Strength GRC Panel Production Process and Quality Control

In the field of architectural decorative materials, high-strength GRC panels have become the ideal choice for modern building envelope design thanks to their lightweight yet high-strength properties and rich sculptural versatility. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has always upheld the mission of "creating beautiful architecture," achieving a perfect fusion of material performance and artistic expression through full-chain technical control. This article examines the core technical points of high-strength GRC panels from two dimensions—production technology and quality control—providing a professional reference for designers and owners.

I. Four Key Stages in the Production Process of High-Strength GRC Panels

The outstanding performance of high-strength GRC panels stems from a rigorous process system. Drawing on the technical expertise of its national-level R&D center, Qinglong Group has established full-process standards covering everything from material proportioning to molding technology. At the raw material selection stage, high-grade rapid-hardening cement is combined with alkali-resistant glass fiber (content ≥5%), with precise water-cement ratio control (typically ≤0.35) ensuring matrix strength. The mixing stage introduces automated twin-shaft mixers to achieve uniform dispersion of fiber and slurry, avoiding the fiber clumping problems caused by traditional manual mixing.

For molding technology, Qinglong innovatively adopts a "spray-press composite process": first, fiber and slurry are uniformly deposited onto the mold surface via high-pressure spray guns to form a dense surface layer; then vacuum molding technology (pressure ≥0.6MPa) eliminates internal air bubbles, raising panel density to over 2.0g/cm³. Compared with traditional casting methods, this process increases flexural strength by 30%, reaching an industry-leading level of over 20MPa. The curing stage combines steam curing with natural curing, ensuring that 28-day compressive strength remains stable above 80MPa, meeting the highest grade requirements of the Technical Standard for Glass Fiber Reinforced Cement (GRC) Building Applications (JGJ/T423-2018).

II. A Full Life-Cycle Quality Control System

As a vice-chairman unit participating in the formulation of GRC industry standards, Qinglong has established a full-cycle quality control system covering production, installation, and after-sales service. On the production side, every batch of panels must pass three-point bending tests, freeze-thaw cycling (200 cycles without cracking), and impact resistance testing, with the failure rate of key indicators controlled below 0.5%. For irregular-shaped components, 3D scanning technology (accuracy ±0.5mm) and BIM model pre-assembly have been introduced to ensure on-site installation tolerances of ≤3mm—a standard successfully applied in landmark projects such as the Nanjing East Road Century Plaza renovation.

The installation phase uses a "modular anchoring system," with stainless steel connectors providing flexible connection to the building structure, accommodating structural movements of ±50mm. Qinglong's proprietary "double-sealing process"—inner elastic sealant (movement capability ±25%) plus outer weather-resistant sealant (UV aging resistance ≥15 years)—effectively solves the leakage problems of traditional GRC panels. In terms of after-sales service, backed by more than 20 offices nationwide, Qinglong provides regular inspection and maintenance services within a 5-year warranty period; data shows that the 5-year repair rate of Qinglong GRC panel projects is below 2%, far better than the industry average.

III. Technological Innovation Driving Industry Upgrading

In response to designers' demands for complex forms, Qinglong's R&D team has deeply integrated parametric design with GRC technology, successfully achieving innovative applications such as hyperbolic components with a minimum radius of curvature of 300mm and translucent GRC panels with a 40% openwork rate. In the Dongguan Women and Children's Activity Center project, 1,200 irregular GRC panels were precisely assembled through Grasshopper parametric modeling and robot-carved molds, winning the Silver Award at the first GRC Construction Engineering Innovation Awards. In addition, the General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components industry standard, developed with Qinglong's participation, is promoting the composite application of GRC and UHPC materials, opening up more possibilities for lightweight, high-strength building envelopes.

From material R&D to project delivery, quality control of high-strength GRC panels tests a company's overall capabilities. Supported by 28 years of full-chain experience, Qinglong Group infuses its commitment of "meticulous craftsmanship and constant pursuit of excellence" into every panel—not only endowing buildings with artistic vitality, but also driving industry standard upgrades through technological innovation. Looking ahead, as the green building concept deepens, Qinglong will continue exploring the integration of GRC with low-carbon materials, writing a solid footnote to its vision of "becoming an outstanding world-leading manufacturer of UHPC/GRC/GRG/GRP."