Technical Breakthrough in Minimum Curvature Radius of Single-Curved GRC Panels: Qinglong GRC Small-Curvature Forming Technology

The minimum curvature radius of single-curved GRC panels can reach R=300mm (at a panel thickness of 15mm), at which point the maximum surface tensile strain is ≤150µε, far below the ultimate tensile strain of GRC (300-500µε). By optimizing the mix ratio (fiber content 3%, water-binder ratio 0.33) and improving the forming process (vacuum vibration, flexible demolding), small-radius bending without cracking is achieved. When R<500mm, a crack-resistant reinforcement layer is required (fiber mesh densified by 50%).

Key technical points: pre-compressive stress on the inner side of the bend ≥0.5MPa to compensate forming tension; gradient transition zone length on curved surfaces ≥100mm to avoid stress concentration; dedicated flexible suction cups used during demolding to release internal stress. A curved curtain wall project successfully achieved the production of single-curved panels at R=350mm, with no visible cracks detected upon inspection and strength meeting standards. Qinglong GRC small-curvature technology expands design possibilities.

Material Adaptability Optimization

Fiber aspect ratio optimized to 60-80 to improve crack resistance; the addition of polymer emulsion raises the ultimate tensile strain to 600µε; maximum aggregate size reduced to 0.3mm to reduce internal defects; plasticizers control viscosity to ensure curved surface filling.

Mold Technology Innovation

Flexible inner mold design allows elastic deformation of ±1.5mm; multi-point control of the demolding mechanism with synchronization accuracy of ±0.1mm; surface coating friction coefficient ≤0.15 to reduce demolding resistance; matched thermal expansion coefficient design to avoid thermal stress.

Forming Process Breakthrough

Layered spraying process with pre-set compressive stress in the inner layer; stepped vacuum control with a maximum of -0.85MPa; adjustable vibration frequency (30-50Hz) to accommodate different curvatures; optimized curing regime with temperature gradient ≤10℃/h.

Testing and Verification

3D scanning to check curvature accuracy of ±0.5mm; strain gauges to monitor forming stress; load tests to verify load-bearing capacity; long-term observation of deformation development. The full set of verifications ensures reliability.

Small curvature enables great creativity. Qinglong GRC technology breakthroughs empower design innovation.