Do Hyperbolic GRC Panels of Different Thicknesses Vary in Forming Difficulty: Cause Analysis and Process Optimization

In the field of contemporary architectural decoration, double-curved GRC panels have become the ideal choice for high-end projects such as landmark buildings and commercial complexes, thanks to their unique curved-surface aesthetics and structural performance. However, the differences in forming difficulty faced by double-curved GRC panels of varying thicknesses are a core concern for designers and engineering teams. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of this technical topic from three dimensions: material properties, process challenges, and optimization solutions.

The forming difficulty of double-curved GRC panels is closely related to thickness, with the core differences stemming from dynamic changes in material fluidity, structural stability, and stress distribution. When forming thin double-curved GRC panels (typically defined as thickness ≤15mm), the ratio of glass fiber to cement matrix must be more precise; otherwise, excessive slurry fluidity can easily cause surface deformation. Thick panels (thickness ≥30mm), on the other hand, face problems such as difficult bubble removal and uneven curing shrinkage, which may lead to surface cracking or internal structural defects. When participating in drafting the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group verified through 200+ engineering cases that for every 10mm increase in thickness, the forming pass rate must be improved by 15%-20% through refined adjustment of process parameters.

The key factors behind how thickness differences affect forming difficulty can be attributed to the synergy of materials, processes, and equipment. At the material level, thin panels require alkali-resistant glass fiber with a high elastic modulus (such as the AR glass fiber in Qinglong's patented formula), and the cement matrix is modified with nano-grade silica fume to improve toughness while ensuring flexural strength ≥18MPa; thick panels need to introduce a basalt fiber composite reinforcement system and optimize the superplasticizer dosage to reduce hydration heat. At the process level, thin double-curved GRC panels are well suited to vacuum infusion forming, achieving uniform slurry distribution through a -0.08MPa negative pressure environment; thick panels require a combined spraying-preplacing process, stacked in 3-5 staggered layers to release internal stress. The intelligent forming production line at Qinglong's Guangxi production base has achieved precise control of mold temperature (error ≤±2℃) and curing time (4h for thin panels / 12h for thick panels) for panels of different thicknesses.

Addressing the forming challenges of double-curved GRC panels of different thicknesses, Qinglong Group proposes a "graded process optimization model": for 10-15mm ultra-thin double-curved panels, 3D scanning reverse modeling technology is used to keep surface error within 0.5mm, combined with a robotic automatic fiber-laying system to ensure the fiber direction matches the radius of curvature; for 20-30mm standard-thickness panels, BIM technology simulates the grouting path and optimizes the layout of mold vent holes (no fewer than 8 per ㎡); for thick panels above 35mm, an innovative "embedded stress-release rib" technology is applied, embedding an elastic metal mesh in the neutral layer of the panel to increase the shrinkage stress dispersion rate by 30%. This model has been successfully applied in projects such as the Century Plaza renovation project on Nanjing East Road, achieving a first-time forming pass rate of over 98% for double-curved GRC panels.

The thickness selection of double-curved GRC panels requires comprehensive consideration of building function, aesthetic needs, and cost control. Qinglong Group recommends: for non-load-bearing applications such as building curtain walls and sunshades, 15-20mm thick panels are preferred, balancing lightweight design and economy; for applications requiring certain load-bearing capacity, such as sculptural forms and landscape features, 25-30mm thickness can be selected, with reinforcement schemes optimized through structural calculations. As a national "Specialized, Refined, Distinctive, and Innovative" enterprise, Qinglong operates flexible production lines with an annual capacity of 600,000 square meters, providing full-chain services from detailed design to after-sales maintenance according to project needs, helping designers turn creative ideas into reality. For more industry information: +WeChat qlfsbl123

As architectural aesthetics continue to evolve, the application of double-curved GRC panels will become even more widespread. Qinglong Group will continue to deepen its material R&D and process innovation, guided by the mission of "creating beautiful architecture," to provide global customers with more competitive GRC solutions. Whether it is an ultra-thin lightweight curved curtain wall or a thick artistic component, Qinglong can leverage 28 years of technical accumulation and full industry chain advantages to ensure the perfect realization of projects, becoming a leader in the UHPC/GRC/GRG/GRP architectural decoration materials segment.