Do Colored UHPC Exterior Walls Fade at Different Rates in Different Climate Zones? A Study on Color Durability and Environmental Adaptability by Qinglong Group

Colored UHPC exterior walls show significant differences in fading rates across different climate zones, mainly influenced by four environmental factors: "UV intensity, temperature and humidity variations, air pollution, and rain washout." Qinglong Group has confirmed through accelerated aging tests and 5 years of tracking data from demonstration projects across 10 climate zones nationwide: in western plateau regions with strong UV radiation (such as Lhasa), the annual fading rate ΔE can reach 0.8-1.2; in coastal high-salt-spray regions (such as Hainan), ΔE is 0.5-0.8; in mild inland cities (such as Chengdu), ΔE is only 0.3-0.5. In the Shenyang Culture and Art Center project, our "low-temperature curing type" colored UHPC developed for the severe cold climate of northern China maintained a ΔE stable within 0.6 after 5 years of use, far exceeding customer expectations. Color durability is a dynamic balance between material and environment.

UV Radiation Is the Primary Cause of Fading

UV photons carry high energy and can degrade the molecular structure of organic pigments. By adding UV absorbers (such as benzotriazoles) and using inorganic mineral pigments (such as iron oxide series), we keep the equivalent ΔE after 3000 hours of UV aging at ≤2.0. For plateau projects, a topcoat with a sun protection factor (SPF) of ≥50 is recommended.

Heat and Humidity Affect Chemical Degradation Rates

High temperature and high humidity environments accelerate pigment hydrolysis reactions. Stability is improved by optimizing curing regimes (extending the low-temperature curing period) and adopting hydrophobic pigment encapsulation technology. For South China projects, we require a 240-hour accelerated test at 85°C/85%RH before shipment.

Pollutant Gases and Acid Rain Catalyze Fading

Industrial SO₂ and NOx can react with pigments. We have developed acid-rain-resistant formulations; after 240 hours of immersion in an acidic solution with pH=3, ΔE ≤1.5. Regular cleaning (1-2 times per year) can effectively remove surface contaminants.

Protective Coatings Are the Key Barrier

Select topcoats according to climate zone: high-elasticity fluorocarbon paint (elongation ≥40%) for arid regions; anti-mold silicone-acrylic paint for humid regions; photocatalytic self-cleaning coatings for polluted regions. We provide recoating cycle recommendations of 5-8 years.

Only by scientifically understanding fading patterns can precise protection be achieved. Through climate adaptability research, Qinglong Group customizes the optimal color scheme for each project.