Do Forming Difficulties Differ for Double-Curved GRC Panels of Different Thicknesses? Exploration and Analysis

In the collision of modern architectural aesthetics and technology, double-curved GRC panels have become the "form-giving code" of landmark buildings with their unique curved surface expressiveness. However, what differences in forming difficulty do double-curved GRC panels of different thicknesses face? As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group will reveal the core logic of this technical challenge to designers and owners from three dimensions: material properties, process control, and engineering practice.

I. The Underlying Logic of Material Thickness and Double-Curve Forming: The Balancing Art of Structural Stability

The forming difficulty of double-curved GRC panels is essentially a dual challenge of material mechanics and curved surface geometry. When the thickness is less than 8mm, the material's flexural strength (high-quality GRC can exceed 20MPa) forms a significant contradiction with the surface curvature: an overly thin base panel is prone to wrinkling during mold pressing, while the laying precision of the glass fiber mesh must reach ±0.5mm; otherwise, there is a risk of cracking caused by locally uneven fiber distribution. Test data from Qinglong Group's production base in Nanning, Guangxi, shows that the forming pass rate of 15mm-thick double-curved panels is 42% higher than that of 8mm panels, which stems from the positive effect of material thickness on the elastic modulus—for every 3mm increase in thickness, the elastic deformation control precision during curved surface forming can improve by 15%.

II. Difficulty Differentiation in the Process Chain: A Full-Process Test from Molding to Curing

In the detailed design phase, thin double-curved GRC panels (8-12mm) require parametric modeling (Rhino+Grasshopper) for stress simulation, focusing on solving the "mold sticking" problem during demolding; thick panels (above 20mm), on the other hand, face the challenge of air bubble removal during concrete pouring, requiring a combination of high-frequency vibration and vacuum degassing technology to ensure the density meets standards. The Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), for which Qinglong participated in drafting, specifically points out that when the thickness of a double-curved panel exceeds 18mm, a layered pouring process must be adopted with each layer controlled at 5-8mm thickness—this undoubtedly extends the production cycle, reducing the forming efficiency of thick panels by approximately 30% compared to thin panels.

III. Solutions in Engineering Practice: Qinglong's Breakthrough Through 28 Years of Technical Accumulation

To address the forming challenges brought by thickness differences, Qinglong Group has innovatively developed the "Gradient Thickness Design Method": in areas where the curvature radius of the double-curved panel is ≤300mm, a 12-15mm thin structure is adopted with fiber orientation optimized through BIM technology; at edge areas with stress concentration, the thickness is increased to 20mm, reinforced with built-in carbon fiber bars. This solution was verified in the renovation project of Century Plaza on Nanjing East Road, where its translucent concrete double-curved components achieved thickness gradient variation over a 3.6-meter span, meeting form requirements while controlling self-weight (only 1/4 of natural stone of the same volume). In addition, Qinglong's independently developed fully automatic spray forming equipment can automatically adjust the spray gun pressure and fiber cutting length according to thickness parameters, keeping the forming error of double-curved panels of different thicknesses within ±1mm.

From the double-curved exterior walls of the Dongguan Women and Children's Activity Center (10mm ultra-thin forms) to the 25mm-thick double-curved relief on a landmark project in Saudi Arabia, Qinglong Group has proven, with its full-chain service capability (detailed design - manufacturing - construction and installation - after-sales maintenance), that the forming difficulty of double-curved GRC panels is not a simple function of increasing thickness, but a system integration of material science, digital technology, and engineering experience. For designers pursuing ultimate forms, choosing Qinglong, a GRC manufacturer with 28 years of industry experience, means obtaining a "zero-error" solution from concept to realization—this is the best interpretation of the mission of "Creating Aesthetic Architecture."