Why Traditional Wooden Molds Cannot Be Used for Free-Form Curved GRC Panels: Causes and Alternative Solutions Analysis

In contemporary architectural design, curved-surface aesthetics is becoming the core language for shaping urban landmarks, and GRC material, with its exceptional moldability, has become the ideal choice for realizing complex curved forms. However, traditional wooden molds are gradually exiting the stage in the production of curved GRC panels—behind this lie not only technical bottlenecks, but also the inevitability of industry innovation. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group will provide an in-depth analysis of the limitations of traditional wooden molds and innovative alternatives from the dual perspectives of technical principles and practical application.

Curved GRC Panel Production: Four Core Pain Points of Traditional Wooden Molds

The production of curved GRC panels places extremely high demands on mold precision, durability, and forming capability, yet traditional wooden molds have limitations that are difficult to overcome in these key indicators. First, the physical properties of wood itself result in insufficient precision when processing complex curved surfaces; especially when the radius of curvature is less than 300mm, wooden molds are prone to deformation and cracking, directly causing ripples or dimensional deviations on the surface of GRC components. Second, wooden molds typically last no more than 10 reuse cycles; for mass-produced curved components, frequent mold replacement not only increases costs but also makes product consistency difficult to guarantee. In addition, the hygroscopicity of wood causes molds to expand and contract during production, affecting the curing of the GRC slurry, while the breakage rate during later demolding can exceed 15%, further driving up production costs. Finally, in today's environment of increasingly stringent environmental policies, the high material consumption of wooden molds stands in stark contradiction to the development philosophy of green building, which is also a key reason for their gradual phase-out.

Innovative Alternatives: Three Technical Paths to Solving Curved Forming Challenges

Facing the limitations of traditional wooden molds, the industry has developed three major alternative technology systems centered on GRP molds, silicone molds, and 3D-printed molds. With their high strength and strong weather resistance, GRP molds have become the mainstream choice for mass production of curved GRC panels, achieving more than 50 reuse cycles and a surface finish that meets Class A decoration requirements, making them particularly suitable for producing single-curvature or regular double-curved components. Silicone molds show unique advantages in the field of highly irregular complex curved surfaces; by precisely replicating the master mold's texture, they can perfectly render fine forms such as hollow-outs and reliefs. In the Nanjing East Road Century Plaza renovation project, Qinglong Group used silicone molds to achieve seamless joining of translucent concrete and GRC curved surfaces. As a cutting-edge technology, 3D-printed molds are generated directly through parametric design, shortening the traditional mold-making cycle from 15 days to 3 days, making them especially suitable for small-batch, highly complex artistic curved components—such as the double-curved irregular GRC curtain wall in the Dongguan Women and Children's Activity Center project, which exemplifies the combination of 3D printing technology and traditional craftsmanship.

Full-Chain Empowerment: Qinglong Group's Practice in Curved GRC Solutions

As a national high-tech enterprise and a participant in formulating GRC industry standards, Qinglong Group has built a full-chain curved GRC service system spanning from detailed design to after-sales maintenance. In the design phase, the Rhino+Grasshopper parametric platform is used to achieve digital modeling and optimization of curved forms, ensuring mold design precision within ±0.5mm; in production, the company's self-developed low-alkalinity cement formula combined with vacuum casting technology keeps the flexural strength of GRC components stable above 20MPa, meeting the structural requirements of large-span curved surfaces; during installation, 3D laser scanning positioning technology, together with modular installation solutions, achieves “zero-error” joining. To date, Qinglong has completed over 500 curved GRC projects at home and abroad, including landmark works such as the curved curtain wall of the podium of the Petronas Twin Towers in Malaysia and the double-curved GRG ceiling of a cultural center in Saudi Arabia, interpreting the corporate mission of “creating beautiful architecture” through technical strength.

The iteration of mold technology for curved GRC panels is essentially the co-evolution of architectural aesthetics and engineering technology. The transition from wooden molds to digital molds not only resolves the contradiction between production efficiency and precision, but also expands the expressive boundaries of architectural forms. In the future, as UHPC and GRC composite technologies mature and AI-driven intelligent mold systems are applied, the cost of realizing curved buildings will be further reduced, bringing more creative designs to life. Guided by the values of “honesty, striving, trust, and collaboration,” Qinglong Group will continue to drive technological innovation in new architectural decoration materials, providing global designers with more imaginative material solutions.