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

**Factory Precasting of UHPC Curtain Wall Panels: Decoding the Creation of High-End Building Skins**

Driven by the dual forces of contemporary architectural aesthetics and engineering technology, ultra-high performance concrete (UHPC) is becoming the "new favorite" for landmark building curtain walls with its outstanding mechanical properties and design freedom. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group knows that the factory precasting stage is the core factor determining the quality of UHPC curtain wall panels. This article systematically analyzes the key steps and technical points of precast production, providing designers and owners with full-process technical insight from drawings to finished products.

**I. Material Formulation and Mixing Process: The Genetic Code of UHPC Performance**

The outstanding performance of UHPC curtain wall panels begins with precise material proportions. The Qinglong production base uses a composite system of custom-grade cement, silica fume, ultra-fine quartz sand, and steel fibers, achieving ±1% batching accuracy through a fully automatic metering system. The mixing process employs a twin-shaft forced mixer, with dry materials and steel fibers added in stages (volume content 2-3%), ensuring fiber dispersion uniformity of over 95%. Specifically addressing the lightweight requirements of curtain wall panels, the R&D team innovatively introduced nano calcium carbonate modification technology, keeping the bulk density below 2400kg/m³ while ensuring compressive strength ≥150MPa—a 15% reduction in self-weight compared to traditional precast concrete.

**II. Mold Engineering and Forming Technology: The Art of Millimeter-Level Precision**

As a national high-tech enterprise, Qinglong integrates BIM technology and CNC machining in mold design. For curtain wall panels with complex shapes such as double curvature and hollow-out designs, aviation-grade aluminum alloy mold frames and replaceable steel mold cavities are used, achieving mold tolerances of ≤0.5mm/m through 3D scanning reverse engineering. The forming process combines vacuum-assisted casting with high-frequency vibration, together with a self-developed rheology modifier that solves the bubble problems caused by UHPC's high viscosity, keeping the surface porosity of components below 0.3%. For light-transmitting UHPC curtain wall panels, an innovative optical fiber positioning and embedding technology achieves precise control of light transmittance.

**III. Curing Regime and Quality Testing: The Key Code for Performance Consolidation**

The curing stage directly determines UHPC strength development and durability. Qinglong has established a three-stage curing system: first, 48 hours of steam curing (80℃ saturated steam) brings early strength to 80% of the design value; then panels are transferred to a standard curing room for 28 days to stabilize strength; finally, 90℃ hot water curing activates latent hydration reactions. The quality testing stage introduces dual safeguards of industrial CT scanning and random mechanical property sampling. Every batch of curtain wall panels must pass 12 indicators, including flexural strength and elastic modulus, under the stringent tests of the General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC), ensuring a performance degradation rate of less than 5% after 200 freeze-thaw cycles.

**IV. Green Production and Smart Management: The Responsibility of an Industry Benchmark**

As a provincial-level R&D center, Qinglong applies green manufacturing principles throughout the entire precasting process. Industrial solid waste replaces 30% of siliceous materials, a closed production line achieves 95% water recycling, and volatile organic compound emissions are reduced by 80% compared to traditional processes. The intelligent management system collects production data in real time and optimizes curing parameters through AI algorithms, shortening the production cycle by 20%. This full-process control capability is precisely Qinglong's core competitive strength in undertaking benchmark projects such as the translucent concrete for Century Plaza on Nanjing East Road.

From the microscopic control of materials science to the macroscopic management of engineering technology, factory precasting of UHPC curtain wall panels is a systematic project of multidisciplinary collaboration. Built on 28 years of full-chain experience, Qinglong Group infuses the craftsmanship spirit of "meticulousness and constant refinement" into every production stage—not only providing safe and durable solutions for building skins, but also driving industry standard upgrades through technological innovation. Choosing a UHPC manufacturer with deep technical expertise is the key guarantee for achieving the perfect unity of architectural aesthetics and structural safety.