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

Factory prefabrication is the "forging furnace" of UHPC curtain wall panel quality; every process step is a dual tempering of material performance and architectural aesthetics.

In the innovation of contemporary building skins, UHPC (Ultra-High Performance Concrete), with its ultra-high strength, excellent durability, and design freedom, has become the preferred material for high-end curtain wall systems. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group understands the decisive role that the factory prefabrication stage plays in the final performance of curtain wall panels. This article systematically analyzes the key steps and technical points of UHPC curtain wall panel factory prefabrication, providing designers and owners with a full-process quality control perspective from material to finished product.

1. Precise Preparation Before UHPC Curtain Wall Panel Prefabrication: Technical Breakthroughs from Mix Formula to Molds

Material mix optimization is the core foundation of the prefabrication process. Drawing on 28 years of engineering practice, the Qinglong technical team has established a UHPC mix ratio database for different climate zones, focusing on controlling steel fiber content (typically 2-5% by volume), the silica fume-to-cement ratio, and the water-binder ratio (strictly controlled at 0.16-0.20), ensuring the material's compressive strength exceeds 150MPa while maintaining good workability. The mold system adopts a combined process of high-precision steel molds and elastic liner molds; for complex shapes such as double curvature and openwork designs, BIM parametric design achieves mold segmentation precision of ±0.5mm—a technical standard successfully applied in benchmark projects such as the Nanjing East Road Century Plaza renovation.

2. UHPC Curtain Wall Panel Forming Process: Coordinated Control of High-Pressure Casting and Precision Curing

In the casting stage, Qinglong has introduced German-imported vacuum high-pressure casting equipment, achieving sealed-chamber filling of concrete at 0.3MPa pressure, combined with high-frequency vibration (vibration frequency of 200Hz) to eliminate air bubbles. For large-size panels (up to 12m×3m per piece), a process combining segmented casting and stepped curing is adopted, with embedded temperature sensors monitoring the core temperature in real time to ensure the temperature difference between inside and outside does not exceed 25℃. The curing stage innovatively adopts a dual-stage "steam curing + natural curing" mode: after 48 hours of curing in a 60℃ steam environment, panels move into 28 days of standard curing, boosting the early strength of components by 30% and effectively preventing shrinkage cracks.

3. Quality Inspection and Surface Treatment: Creating the "Looks and Strength" of UHPC Curtain Wall Panels**