Can UHPC Shapes Achieve Gradient Color Effects? Coloring Process and Color Control Technology

The color gradient effect of UHPC shapes can be achieved through multiple techniques such as integral coloring, surface coating, and digital printing, with color transition naturalness of ΔE≤3.0 and weather resistance up to grade 7-8. In the translucent UHPC project at Shanghai Century Plaza, Qinglong Group successfully achieved a smooth gradient from warm yellow to cool white through layered casting technology with mineral pigments, with lasting and stable results. Color gradients not only enhance artistic expressiveness but also expand the application boundaries of UHPC in architecture.

Integral coloring is the best solution for durability. Different colored slurries are added during mixing, and color blending is achieved by controlling the casting sequence and vibration process. Qinglong Group adopts a dual-pumping system to precisely control the proportions of each colored slurry and the blending zones, with adjustable gradient band width (10-50cm). Iron oxide-based inorganic pigments are selected for their strong light resistance and firm bonding with the matrix, with a lifespan synchronized with UHPC.

Surface coating is suitable for complex gradients. Digital inkjet technology is used to print patterns directly on the outer surface, with resolution up to 1440dpi. A primer is applied first to enhance adhesion, and a protective coating is applied after printing. In a commercial complex project in Nanning, photographic-quality image effects were achieved using UV-curable inks. Regular maintenance can keep the colors vibrant.

Color control requires precision throughout the entire process. Standard color cards are established, and each batch of material undergoes color difference testing during mass production. The curing regime affects color uniformity, requiring strict control of temperature and humidity. Through an automated color matching system, Qinglong Group keeps color difference fluctuation within ΔE≤1.5, ensuring consistent gradient effects. The color expressiveness of UHPC is opening a new chapter in architectural art.