How to Optimize Fiber Orientation in Double-Curved UHPC Forms: Mechanism Analysis and Process Parameter Regulation Research

The Artistic Beauty of Double-Curved UHPC Stems from the Scientific Control of Fiber Orientation — The Technical Code Behind Qinglong's 28 Years of Craftsmanship

At the intersection of contemporary architectural aesthetics and engineering technology, ultra-high performance concrete (UHPC), with its outstanding mechanical properties and freedom of form, has become the ideal material for shaping complex architectural forms such as double-curved surfaces. However, optimizing the fiber orientation of double-curved UHPC components has always been the core issue that determines their structural safety and artistic expressiveness. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group, drawing on its full-chain technical accumulation, has developed systematic solutions in fiber orientation mechanism research and process parameter control, providing solid technical support for designers to realize the vision of “architecture as art.”

### The Mechanism of Fiber Orientation in Double-Curved UHPC: From Microstructure to Macro Performance

The mechanical performance of double-curved UHPC components depends heavily on the three-dimensional distribution of fibers. The orientation of fibers in the matrix not only affects flexural strength (premium UHPC can exceed 20MPa), but is also directly related to crack control of components under complex stress fields. Through scanning electron microscopy observation and finite element simulation, Qinglong's technical team found that in regions where surface curvature changes, fibers tend to develop a “surface-seeking effect” along the flow direction, reducing fiber density in the thickness direction and creating structural weak points. This mechanism analysis points the direction for process optimization — multi-dimensional parameter coordination is required to break through the anisotropic limitations of fiber orientation under traditional casting modes.

### Four Key Dimensions of Process Parameter Control

**1. Precise Design of Material Mix Proportions** As a national-level high-tech enterprise, Qinglong has introduced fiber dispersion improvement technology in its UHPC formula development. By adjusting the aspect ratio of steel fibers (preferably 15-20) and incorporating nano-scale silica fume, fibers remain uniformly suspended in fresh concrete, reducing orientation deviations caused by gravitational settlement. In the Nanjing East Road Century Plaza translucent concrete project, this technology improved the fiber distribution uniformity of double-curved components by 37%.

**2. Innovative Breakthroughs in Forming Processes** Addressing the characteristics of double-curved surfaces, Qinglong has developed a composite process of “rotary casting + vacuum assistance.” Through programmable rotating molds (minimum curvature radius ≤300mm) and gradient pressure control, fibers are guided to align along the principal stress direction of the curved surface. Compared with traditional casting processes, this method raises the surface fiber volume ratio of components to 4.2% and improves flexural strength by 22%, and has been successfully applied to the double-curved GRC/UHPC composite curtain wall of the Dongguan Women and Children's Activity Center.

**3. Intelligent Optimization of Curing Regimes** Leveraging the R&D strength of its provincial engineering technology center, Qinglong has established a curing parameter database based on BIM technology. For different surface curvatures, temperature gradients (50-80°C) and humidity curves (≥90%) are automatically matched to promote hydration reactions in the fiber-matrix interfacial transition zone. This precise curing enables the 28-day compressive strength of double-curved components to stably exceed 150MPa, meeting the durability requirements of landmark buildings.

**4. Full-Cycle Quality Inspection and Control** As a participating drafter of the industry standard “General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC),” Qinglong has introduced RFID chip traceability and 3D laser scanning technology. From raw material entry to finished product installation, fiber orientation distribution, component geometric precision (error ≤2mm), and anchoring system safety are monitored in real time, ensuring that every double-curved UHPC component meets the quality commitment of “meticulous workmanship and the relentless pursuit of excellence.”

### Qinglong's Full-Chain Service: From Design Concept to Delivered Reality

Optimizing fiber orientation in double-curved UHPC is by no means a technical issue confined to a single production stage, but a systematic project spanning detailed design, manufacturing, and construction installation. Guided by its mission of “creating aesthetically beautiful architecture,” Qinglong Group integrates 28 years of industry experience: in the design phase, parametric modeling (Rhino+Grasshopper) simulates fiber flow paths; in production, intelligent production lines with an annual capacity of 600,000 square meters are employed; in installation, modular lifting and 3D positioning are implemented — ultimately achieving a seamless transformation from creative drawings to architectural reality. To date, Qinglong's double-curved UHPC technology has been widely applied in high-end projects such as commercial complexes and museums, and exported to overseas markets including Australia and Saudi Arabia.

From micro-level exploration in materials science to macro-level innovation in engineering practice, the path of optimizing fiber orientation in double-curved UHPC demonstrates the deep integration of building technology and artistic aesthetics. Qinglong Group will continue, guided by its vision of “becoming an outstanding world-leading manufacturer of UHPC/GRC/GRG/GRP,” to provide global designers with more imaginative material solutions, making every double-curved building a perfect unity of safety and beauty.