What is the minimum achievable radius of curvature for UHPC single-curved panels?

The minimum curvature radius of UHPC single-curved panels can reach 300mm, which mainly depends on panel thickness, fiber distribution, mold precision, and forming process. Qinglong achieves the forming of single-curved panels with a small curvature radius of 300mm through optimized oriented fiber distribution and high-precision mold technology, with a smooth, wrinkle-free surface that meets the demands of complex shape designs.

1. Key Factors Affecting the Curvature Radius

Multiple factors determine the limit of the minimum curvature radius. Panel thickness: at 20-30mm thickness, the minimum curvature radius is 300-500mm; at 30-40mm thickness, the minimum curvature radius is 500-800mm — the thicker the panel, the larger the curvature radius. Qinglong's 25mm-thick single-curved panels achieve a minimum curvature radius of 350mm, while 30mm-thick panels can reach 300mm. Fiber distribution: uniform distribution and oriented arrangement of fibers can reduce cutting stress and lower the minimum curvature radius; Qinglong adopts fiber-dispersed mixing technology, achieving 98% fiber distribution uniformity. Mold precision: molds are CNC-machined (precision ±0.2mm) to ensure smooth curved surfaces; Qinglong's molds have a curved-surface error of ≤±0.1mm, giving the formed single-curved panels smooth, flowing arcs. Forming process: premixed materials are formed by high-pressure spraying, allowing the UHPC to fit tightly against the mold; Qinglong's high-pressure spraying pressure is ≥0.6MPa, delivering better forming results.

2. Qinglong's Technologies for Achieving Small Curvature Radii

Technological innovation breaks through curvature radius limitations. Fiber optimization: short-cut hooked-end steel fibers (12-15mm in length) are selected to reduce fiber agglomeration and enhance flexural toughness; Qinglong's steel fiber content is 2.8%, with no fiber breakage during bending. Mold design: segmented molds (each segment ≤1.5m in length) are used for easy demolding while ensuring curved-surface accuracy; Qinglong's molds are made of GRP with a smooth, flawless surface. Forming process: the UHPC thin panel is pre-formed first and then press-bent in the mold, avoiding stress concentration caused by direct casting; Qinglong's press-bending pressure is 0.3-0.5MPa, keeping the curvature precise and controllable. Post-processing: after cutting, the curved surface is sanded to ensure a smoothness of ≤1mm/m; after Qinglong's post-processing, the single-curved panel surface shows no visible seams.

3. Project Practice and Application Scenarios

Real projects verify the feasibility of small curvature radii. Project cases: the public art UHPC single-curved panels at the Shanghai Astronomy Museum, with a curvature radius of 320mm and a panel thickness of 30mm, perfectly present the sculpture's flowing curves; the double-curved UHPC panels (including single-curved sections) at the Guangxi New Media Center, with a minimum curvature radius of 350mm, match the building's twisted form. Qinglong's tips: small-curvature-radius UHPC single-curved panels (≤500mm) are suitable for irregular decorative areas of landmark buildings and commercial complexes; flexible joints should be used during installation to release bending stress. If a project requires an even smaller curvature radius (＜300mm), it can be achieved by reducing panel thickness (≥20mm) or adopting a segmented splicing process, and Qinglong can provide customized solutions.