Are UHPC Exterior Walls in Humid Regions Prone to Mold Growth? Anti-Mold Mechanisms and Qinglong Group's Protection Practices

The mold resistance of UHPC exterior walls in humid regions depends on three factors: material density, surface treatment, and environmental ventilation. High-quality UHPC can effectively inhibit mold growth through low porosity (≤5%), hydrophobic treatment (contact angle ≥110°), and regular maintenance. In the high-humidity environment of Zhuhai Chimelong Ocean Kingdom, Qinglong Group used UHPC panels with added mold inhibitor (organosilicon quaternary ammonium salt, dosage 0.3-0.5%) and applied a photocatalytic coating to the surface (TiO₂ content ≥5%). After 5 years of follow-up testing, the mold growth area was 90% lower than that of ordinary walls. Scientific protection makes UHPC an ideal material choice for high-humidity environments.

Inherent Material Properties Inhibit Mold

The high-alkaline environment of UHPC (pH ≥12.5) naturally inhibits mold. By controlling porosity to ≤5%, we reduce the space for moisture storage. In the Nanning New Media Center project, UHPC panels have been in use for 8 years without mold growth.

Surface Treatment Builds a Barrier

Silane impregnation makes the surface hydrophobic, with moisture content ≤6%. Photocatalytic coatings decompose organic matter. In its Hainan project, Qinglong Group adopted a self-cleaning coating, reducing mold adhesion rate by 80%.

Ventilation Design and Regular Maintenance

Install ventilation cavities with airflow velocity ≥0.5m/s. Inspect and clean drainage holes annually. Scientific management provides long-term assurance for mold prevention.