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

In today's era of continuous innovation in building envelope technology, UHPC curtain wall panels are becoming the "star material" of landmark buildings, thanks to their ultra-high strength, excellent durability, and outstanding design expressiveness. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the decisive impact of the factory prefabrication stage on the final quality of curtain wall panels. This article systematically analyzes the key steps and quality control points in the factory prefabrication of UHPC curtain wall panels, providing professional technical reference for designers and owners.

1. Raw Material Proportioning and Mixing Process: The Source Guarantee of UHPC Performance

The outstanding performance of UHPC curtain wall panels begins with a scientific material formula. Qinglong uses custom-grade quartz sand, silica fume, ultra-fine cement, and dedicated steel fibers, following a golden mix ratio verified by 28 years of engineering practice (steel fiber volume content of 2%-3%), ensuring material compressive strength ≥150MPa and flexural strength ≥25MPa. The mixing process uses a double-shaft compulsory mixer, with strict control of mixing time (≥5 minutes) and material feeding sequence to ensure uniform dispersion of steel fibers without clumping. Notably, mixing water must be softened (total hardness ≤50mg/L) to prevent impurities from affecting the hydration reaction—a detail that makes the durability of Qinglong UHPC products 30% higher than the industry average.

2. Mold Design and Forming Process: The Core of Precision Control

As a National High-Tech Enterprise, Qinglong has achieved technological breakthroughs in mold craftsmanship. CNC-machined aluminum alloy molds (precision error ≤0.5mm) combined with modular design not only meet the requirements of complex shapes such as double-curved surfaces and openwork patterns, but also enable over 80% mold turnover and reuse. The forming stage adopts vacuum casting + high-frequency vibration technology, with the vacuum level controlled below -0.08MPa to effectively remove air bubbles; the vibration frequency is set at 50-60Hz, ensuring concrete compactness above 99.8%. For components with thickness ≥50mm, an innovative layered casting process is adopted, with each layer no thicker than 20mm, avoiding cracking risks caused by concentrated hydration heat.

3. Curing Regime and Quality Testing: The Key Guarantee of Stable Performance

Scientific curing is the "accelerator" of UHPC strength development. Qinglong has established a three-stage curing system: first, 48 hours of constant-temperature curing in a 60℃ steam curing room (relative humidity ≥95%) to rapidly reach 70% of the design strength at an early stage; then 28 days of water curing at 20℃ to promote full hydration; finally, 14 days in a natural environment to achieve performance stability. Each batch of products must pass strict testing: in addition to conventional compressive and flexural strength tests, 23 additional indicators are tested, including chloride ion penetration coefficient (≤1.0×10⁻¹²m/s) and frost resistance (no damage after 500 cycles between -40℃ and 50℃), ensuring compliance with the T/CBMF171-2022 standard "Ultra-High Performance Concrete (UHPC) Exterior Wall Panels".

4. Whole-Process Quality Traceability: An Industry Benchmark in Digital Management

As an enterprise that has participated in formulating multiple national and industry standards, Qinglong was the first to introduce an RFID chip traceability system. Each curtain wall panel is implanted with a unique identity chip at the prefabrication stage, recording full life-cycle information such as raw material batches, production parameters, and testing data. Combined with a digital production management platform built on BIM technology, fully visualized monitoring from design development to factory inspection is achieved. This "one item, one code" quality traceability system has earned Qinglong UHPC curtain wall panels high recognition in high-end real estate projects such as Vanke and Xinghewan, with a 100% fulfillment rate for overseas projects.

Factory prefabrication is the "critical" link in the quality control of UHPC curtain wall panels, and its craftsmanship level directly determines the safety and aesthetics of the building envelope. Drawing on 28 years of professional expertise, Qinglong Group has built an industry-leading UHPC prefabrication quality control system through refined proportioning, precision forming, scientific curing, and digital management. In the future, with the advancement of the industry standard "General Technical Requirements for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", Qinglong will continue to leverage its strengths as a National Specialized, Refined, Distinctive, and Innovative enterprise, providing more innovative and reliable UHPC solutions for the architectural decoration field and helping to realize the corporate mission of "Creating Beautiful Buildings".