Analysis of Key Steps and Technical Points in the Factory Prefabrication Phase of UHPC Curtain Wall Panel Production

In the field of contemporary architectural decoration, UHPC curtain wall panels have become the preferred “skin” for landmark buildings thanks to their outstanding mechanical performance and artistic expressiveness. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group understands that the factory prefabrication stage is the core factor determining curtain wall panel quality. This article systematically analyzes the key steps and technical points of factory prefabrication for UHPC curtain wall panels, providing a professional reference for designers and owners.

1. Precise Material Proportioning: The Foundation of UHPC Performance

The prefabrication of UHPC curtain wall panels begins with precise control of materials science. Qinglong Group uses an optimized mix of quartz sand, cement, steel fibers, and ultra-fine silica fume. Through forming pressure above 200MPa and a steam curing process, the material achieves a compressive strength exceeding 150MPa and a flexural strength of over 25MPa. Compared with traditional GRC materials, the fiber content in UHPC is increased to 2% and combined with nano-grade admixtures, achieving material properties that balance strength and toughness and laying the foundation for subsequent complex shape processing.

2. Digital Detailed Design: A Bridge from Drawings to Components

Leveraging BIM technology and a parametric design platform, the Qinglong team transforms the curved forms of building curtain walls into producible component models. Joint optimization is performed using Rhino and Grasshopper software, ensuring that each UHPC curtain wall panel weighs no more than 80kg while meeting the mechanical requirements for transportation and installation. For special shapes such as double-curved and hollowed-out forms, 3D scanning and reverse modeling technology keeps design deviations within ±2mm—a precision standard that has earned the highest rating from the International GRC Association.

3. Mold Engineering: The First Line of Defense for Forming Quality

Mold craftsmanship directly determines the surface precision and geometric dimensions of UHPC curtain wall panels. Qinglong adopts a solution combining custom steel molds and composite resin molds: steel molds are used for producing flat standard panels, ensuring a service life of more than 1,000 cycles, while resin molds serve shaped components, achieving 0.1mm-level surface finish through CNC machining. Laser positioning technology is applied during mold assembly, together with a vacuum sealing system, effectively preventing air bubbles and slurry leakage during concrete pouring.

4. Casting and Curing: Key Processes for Strength and Durability

In the casting stage, Qinglong's original “layered placing + high-frequency vibration” process ensures that steel fibers are evenly distributed throughout the concrete matrix, avoiding agglomeration. After casting, the components enter a fully automatic temperature-controlled curing kiln, undergoing 24 hours of steam curing at 90°C, which increases early strength by 40%. For extra-large components (such as sunshades longer than 6 meters), prestressed tensioning technology is used to counteract shrinkage stress—a process successfully applied to the translucent UHPC curtain wall of the Nanjing East Road Century Plaza renovation project.

5. Quality Inspection: A Full-Process Traceable Quality Control System

As a national-level high-tech enterprise, Qinglong has established comprehensive testing standards covering everything from raw materials to finished products. Each batch of UHPC curtain wall panels must pass tests for frost resistance (50 cycles between -40°C and 50°C), wear resistance (≤3.0kg/m²), and fire performance (Class A1 non-combustible). RFID chip implantation technology enables full life-cycle traceability of components from production to installation, and this management model has become an important reference for the development of the industry standard “General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components.”

From material R&D to intelligent manufacturing, the factory prefabrication of UHPC curtain wall panels is the crystallization of technology and experience. With an intelligent production base boasting an annual capacity of 600,000 square meters, Qinglong Group transforms 28 years of accumulated craftsmanship into stable and reliable product quality. Whether for the curved curtain walls of commercial complexes or the artistic forms of cultural venues, only by strictly controlling every detail of the prefabrication process can UHPC materials truly become the perfect vehicle for architectural aesthetics and engineering safety. As advocated in Qinglong's mission of “Creating Beautiful Architecture,” professional prefabrication processes are the solid foundation for achieving this goal.