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

Driven by the dual forces of contemporary architectural aesthetics and engineering technology, UHPC (Ultra-High Performance Concrete) facade panels, with their outstanding mechanical properties and artistic expressiveness, are becoming the material of choice for high-end building envelopes. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group deeply understands the decisive role that the factory prefabrication stage plays in the quality of the final product. This article systematically analyzes the key steps in the prefabrication production of UHPC facade panels, revealing how material properties and process innovation together shape the ultimate expression of the building envelope.

1. Raw Material Formulation: The Genetic Code of UHPC Facade Panel Performance

The outstanding performance of UHPC facade panels begins with a precise material formulation. Leveraging the technical advantages of its provincial-level R&D center, Qinglong Group adopts a golden ratio of quartz sand, cement, steel fibers, and specialty additives. Through more than 200 rounds of experimental optimization, the compressive strength of prefabricated panels consistently exceeds 150MPa, with flexural strength reaching above 25MPa. Compared with traditional GRC materials, UHPC achieves a 20% reduction in density while durability is tripled, meeting the service requirements of landmark buildings for more than 50 years. During production, raw materials must undergo three-stage screening and magnetic impurity removal, ensuring the air content per cubic meter of concrete is controlled within 2%, laying the microstructural foundation for subsequent molding.

2. Mold System: The Industrial Cornerstone of Precision Casting

As the carrier of customized building envelopes, mold technology directly determines the forming precision of UHPC facade panels. Qinglong uses aerospace-grade aluminum alloy and fiberglass-reinforced plastic composite molds, achieving 0.1mm-level precision control through five-axis machining centers to perfectly reproduce design details ranging from minimalist lines to complex reliefs. For double-curved facade panels, an adjustable flexible mold system has been innovatively developed; combined with BIM parametric design, the dimensional deviation of individual panels is controlled within ±2mm. The mold surface is treated with a nano-ceramic coating, which not only ensures smooth demolding of the concrete but also creates a mirror-like surface texture on the panels, reducing later finishing work.

3. Casting and Curing: The Transformation from Fluid to Solid

The casting process of UHPC facade panels resembles a precision chemical experiment. Qinglong's production line adopts vacuum-assisted casting technology, achieving concrete self-leveling in a -0.08MPa negative-pressure environment, combined with high-frequency vibration to expel air bubbles so that steel fibers are evenly distributed in three dimensions. The curing stage adopts a three-stage temperature control system: 24 hours of steam curing at 50℃ accelerates the hydration reaction, 72 hours of constant temperature and humidity curing improves strength stability, and finally 7 days of natural curing releases internal stress. This process raises the 28-day strength compliance rate of the panels to 99.6%, far above the industry average.

4. Quality Inspection: A Fully Traceable Quality Control System

As a national high-tech enterprise, Qinglong has established a full-chain inspection mechanism covering raw materials, semi-finished products, and finished products. Each batch of facade panels must pass 12 indicator tests including flexural strength, elastic modulus, and freeze-thaw cycling, with the chloride ion penetration coefficient required to be below 1×10⁻¹²m/s. RFID chip implantation technology has been innovatively introduced to record full life-cycle data from raw material formulation to curing parameters, combined with 3D laser scanning for dimensional verification, ensuring that products comply with the T/CBMF171-2022 standard for Ultra-High Performance Concrete (UHPC) Exterior Wall Panels.

Factory prefabrication is the core link through which UHPC facade panels achieve the unity of architectural aesthetics and structural safety. Through 28 years of technical accumulation, Qinglong Group has deeply integrated materials science, digital manufacturing, and engineering experience, making every facade panel a precise work of architectural art. From the 3,000㎡ double-curved UHPC envelope of a commercial complex in Guangzhou to the translucent concrete components of the Nanjing East Road renovation project, Qinglong empowers the realization of architectural creativity with industrialized production capability, interpreting its corporate mission of "creating beautiful architecture". In the field of new architectural decoration materials, the factory prefabrication technology of UHPC facade panels is continuously driving building envelope systems to evolve toward lighter, stronger, and more expressive forms.