Detailed Explanation of the Steps in the Production Process of UHPC Exterior Wall Decorative Lines

The artistic expression of architectural curtain walls often depends on craftsmanship precision in the details. As a company deeply rooted in the field of ultra-high performance concrete (UHPC), Qinglong Group's 28 years of full-chain experience shows that the birth of an exterior wall decorative line requires precise collaboration from material science to engineering aesthetics. The following systematically breaks down the standardized production process of UHPC exterior wall decorative lines, revealing how they become the “finishing touch” of the modern building skin.

1. The Golden Ratio of UHPC Material Formulation: The Balancing Art of Performance and Shaping

The outstanding performance of UHPC exterior wall decorative lines begins with laboratory-grade material formulation R&D. Qinglong's technical team adopts a four-component composite system of quartz sand, cement, steel fiber, and ultra-fine silica fume, and through orthogonal tests has optimized a core mix with a water-binder ratio of 0.18-0.22, ensuring that compressive strength exceeds 150MPa while maintaining an elastic modulus of 3-5% to cope with temperature stress. Notably, for projects in different climate zones, the steel fiber content (typically 2-3% by volume) is dynamically adjusted, with frost-resistance additives added in severe cold regions and enhanced resistance to chloride ion penetration for coastal projects. This customized formulation capability is a reflection of Qinglong's technical accumulation as a National High-Tech Enterprise.

2. Digital Detailed Design: Precise Transformation from Drawings to Components

When the architect's creative sketches are converted into construction drawings, Qinglong's BIM detailed design team launches three-dimensional parametric modeling. Taking the double-curved irregular lines of a commercial complex project as an example, technicians built the parametric model with Rhino+Grasshopper, keeping design tolerances within ±0.5mm. Finite element analysis software is used to simulate stress states at key nodes: for example, the connection joints between the lines and the main structure must be verified with ANSYS for displacement under wind loads, ensuring the anchoring system provides the safety redundancy required for a 50-year service life. This digital design capability enabled Qinglong to achieve millimeter-level installation precision in benchmark projects such as the Century Plaza renovation on Nanjing East Road.

3. Mold Engineering: The “Skeletal System” of UHPC Forming

Mold craftsmanship directly determines the surface texture and dimensional accuracy of the lines. Qinglong uses aerospace-grade aluminum alloy to make master molds, milled and formed on five-axis machining centers, ensuring a mold surface roughness of Ra≤3.2μm. For lines with complex shapes, the innovative “split-type combined mold” technology is adopted, breaking irregular components down into 3-5 modular units, which ensures easy demolding while reducing mold manufacturing costs. At the Nanning production base in Guangxi, every mold is equipped with temperature sensors and a vacuum system to ensure a uniform in-mold temperature (±2℃) during casting—one of the core guarantees behind Qinglong's annual production capacity of 600,000 square meters.

4. Precision Casting and Curing: Key Processes in UHPC Strength Development

The casting process uses vacuum-assisted casting technology combined with high-frequency vibration (200Hz) to remove air bubbles, achieving concrete compactness of over 99.8%. Addressing the thin-wall characteristics of decorative lines (as thin as 15mm at the thinnest point), Qinglong developed a dedicated self-compacting UHPC mix with the spread controlled at 750±50mm, ensuring complete filling of complex shapes. The curing stage adopts a dual-stage process of “steam curing + natural curing”: first, 24 hours of curing in a 60℃ steam environment, followed by 7 days in a constant-temperature, constant-humidity workshop, allowing early strength to quickly reach 80% of the design value and effectively shortening the production cycle.

5. Surface Treatment and Quality Inspection: Craftsmanship in Every Detail

The formed lines must go through five surface treatment processes: initial grinding (removing flash) → fine grinding (800-grit sandpaper) → sealing (penetrating silane treatment) → coloring (mineral pigment blending) → top coating (fluorocarbon varnish). Quality inspection follows the “three-inspection system”: first-article inspection (full testing of material properties), in-process inspection (dimensional deviation ≤2mm/m), and ex-factory inspection (flexural strength ≥20MPa). For exposed decorative surfaces in particular, 3D laser scanning is used for flatness testing, ensuring an error of no more than 0.3mm per meter. This rigorous standard has enabled Qinglong products to be successfully applied in overseas projects in Malaysia, Australia, and beyond.

From material R&D to finished product delivery, the manufacturing process of UHPC exterior wall decorative lines embodies the interdisciplinary wisdom of material science, engineering mechanics, and digital technology. As an enterprise that participated in formulating the industry standard “General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)”, Qinglong Group has always maintained an attitude of “meticulousness and the pursuit of excellence”, integrating its 28 years of full-chain experience into every production step. When these lines, combining strength and beauty, are finally installed on the building facade, they are not merely decorative elements but a tangible expression of modern construction technology—a vivid practice of Qinglong's mission to “create aesthetic architecture”.