Differences in Mold Requirements Between UHPC Single-Curve and Double-Curve Panels and Key Technical Analysis

In the field of architectural decoration, UHPC (Ultra-High Performance Concrete) has become the material of choice for high-end projects thanks to its outstanding mechanical properties and sculptural expressiveness. Among its common forms, single-curved panels and double-curved panels differ significantly in mold design and manufacturing. 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 technical essentials of both—from mold precision control and material compatibility to process complexity—offering a professional reference for designers and owners.

I. Single-Curved Panel Molds: Balancing Standardization and Economy

Since UHPC single-curved panels feature a single-direction curved surface (such as curved exterior wall panels and sunshade canopies), their mold design focuses on structural stability and mass production efficiency. Three core technical characteristics stand out: First, the mold base material is typically steel or high-density resin, with CNC machining used to precisely replicate the single curvature; the radius of curvature is usually kept above 1.5 meters to ensure flowability during concrete pouring. Second, a modular splicing design allows a single mold set to accommodate the production of panels in different lengths—for example, the single-curved panel molds at Qinglong Group's Nanning production base achieve a turnover rate of 8-10 cycles per month, significantly reducing costs. Finally, optimizing the demolding angle is critical: a draft angle design of 0.5°-1°, combined with a dedicated release agent, prevents surface damage to components caused by UHPC's high bond strength.

II. Double-Curved Panel Molds: The Dual Challenge of Precision and Form Freedom

Compared with single-curved panels, the mold technology for UHPC double-curved panels (such as double-curved museum facades and sculptural landscape features) increases in complexity by an order of magnitude. Drawing on its participation in the translucent concrete project at Century Plaza on Nanjing East Road, Qinglong Group has identified three core challenges: First, parametric modeling of double-curved surfaces—surface mesh subdivision must be performed with Rhino and Grasshopper software, and mold tolerances must be kept within ±0.5mm to ensure precise alignment with the building's BIM model. Second, flexible mold application—for double-curved components with small radii of curvature (≤500mm), fiberglass-reinforced plastic (GRP) composite molds are used, leveraging their elastic deformation to form complex curved surfaces while guaranteeing a service life of more than 10 uses. Third, stress release design—double-curved panels are prone to internal stress concentration during curing, so adjustable support points must be provided at the bottom of the mold, combined with gradient temperature control during steam curing (20°C→60°C→20°C), to keep warpage within 0.3mm/m.

III. Key Technical Comparison and Qinglong's Solutions

In terms of material selection, single-curved panel molds can adopt composite steel-and-timber structures, whereas double-curved panel molds require all-metal or GRP materials to guarantee precision. In terms of cost structure, the design and manufacturing cost of a double-curved panel mold is roughly 3-5 times that of a single-curved panel mold, which is why they are typically reserved for landmark projects. As a national 'Specialized, Refined, Distinctive, and Innovative' enterprise, Qinglong Group addresses industry pain points through three technical innovations: 1) Its self-developed digital mold management system, which enables full-process traceability from design to production and has been applied to award-winning projects such as the Dongguan Women and Children's Activity Center; 2) Modular double-curved mold technology, which raises mold reuse rates by 40% through detachable curved units; 3) UHPC flow simulation software jointly developed with South China University of Technology, which predicts bubbles and defects during double-curved casting in advance, keeping the finished product pass rate stable at over 98%.

Whether it is the efficient mass production of single-curved panels or the artistic expression of double-curved panels, mold technology remains the core guarantee of UHPC component quality. With an annual production capacity of 600,000 square meters, 58 patented technologies, and its standing as a member of the International GRC Association, Qinglong Group has provided full-chain services—from detailed design to after-sales maintenance—for more than a thousand projects at home and abroad. Looking ahead, as parametric design and intelligent manufacturing become ever more deeply integrated, UHPC mold technology will advance toward greater precision, economy, and environmental friendliness, injecting sustained momentum into the mission of 'creating beautiful architecture.'