What Are the Surface Decoration Treatment Methods for UHPC Exterior Wall Panels? A Diversified Technical System from Basic Protection to Artistic Expression

Surface decorative treatment of UHPC exterior wall panels is the key bridge connecting material performance and architectural aesthetics. It not only determines the appearance texture and color durability, but also directly affects long-term properties such as weather resistance and self-cleaning. As the Qinglong Group with 28 years of deep expertise in the UHPC field, we have drawn on practical experience from nationwide landmark projects such as the Wuhan Han Show Theater and Hainan International Convention and Exhibition Center to summarize the UHPC surface decoration technology system into a four-layer architecture of "substrate modification + texture shaping + color imparting + functional coating". Through scientific combination, dozens of artistic effects can be achieved, including stone imitation, wood imitation, metallic texture, light transmission, and gradient colors, meeting diverse architectural needs ranging from minimalist modern to retro classic. Quality treatment should ensure surface weather resistance of over 10 years without significant fading (ΔE≤3.0) and a stain resistance rating of Grade 0, giving buildings an enduring, ever-fresh visual appeal.

Substrate treatment is the foundation of decorative effects, with the core lying in controlling surface porosity and flatness. Qinglong Group adopts vacuum dewatering and high-pressure molding processes to reduce the water absorption of UHPC substrate panels to below 3%, providing a uniform carrier for subsequent treatment. For stone-imitation effects, we transfer natural stone textures through CNC-carved molds, with texture depth reaching 0.5-2mm and fidelity exceeding 95%. In the translucent UHPC project at Shanghai Century Plaza, customized silicone molds precisely replicate stone veins, combined with mineral pigment penetration technology, achieving a texture nearly indistinguishable from natural granite. For minimalist styles, mechanical polishing or acid etching can be applied to obtain mirror or matte finishes, with surface roughness Ra values controllable within the range of 0.8-6.3μm.

Color and functional coatings guarantee durability. We prefer fluorocarbon resin coatings, whose UV resistance (ΔE≤2.0 after 3000h of QUV aging) far exceeds that of ordinary paints, along with excellent self-cleaning properties. In the Shenzhen Yirui Biotechnology Building project, Qinglong Group adopted a three-coat one-bake process with dry film thickness ≥30μm, enabling the walls to automatically wash away dust after rain. For special functional requirements, such as translucent decoration, light-guiding fibers can be embedded in UHPC with a high-transmittance protective film applied to the surface, presenting a uniform and soft inner glow at night. Smart coatings such as antibacterial and photocatalytic pollutant-decomposing coatings are also gradually being applied in specific venues such as hospitals and schools.

Decorative treatment should be designed in coordination with the installation system. The color of sealant at joints must coordinate with the panel surface color scheme to avoid abrupt color differences. Qinglong Group recommends producing 1:1 physical samples at the design stage and conducting long-term outdoor exposure tests to verify color stability. Through this systematic decorative treatment system, UHPC exterior wall panels truly achieve a perfect unity of artistic expression and practical function.