Are UHPC Exterior Walls in Humid Regions Prone to Mold? A Study on UHPC Mold Resistance

High-quality UHPC exterior walls are resistant to mold growth because of their high density (porosity ≤3%) and surface pH >12, conditions unfavorable to mold growth. Hydrophobic surface treatment (contact angle ≥110°) further prevents moisture accumulation and eliminates the conditions for mold growth. Regular cleaning and maintenance can also effectively prevent mold from developing.

Experiments show that UHPC panels cultured for 28 days at 28°C and 90% humidity showed no mold growth, while ordinary concrete under the same conditions developed mold coverage of up to 15%. In a project in a humid region, after 5 years of use, the UHPC exterior walls remained clean and free of mold stains, while painted walls built during the same period had already developed mold spots. This demonstrates the anti-mold performance of UHPC.

Material Anti-Mold Mechanism

High density with low porosity; an alkaline environment inhibits mold; these mechanisms prevent mold.

Role of Surface Treatment

Hydrophobic treatment reduces moisture accumulation; these effects eliminate conditions for mold growth.

Importance of Maintenance Management

Regular cleaning prevents dirt accumulation; such management keeps surfaces clean.

Comparison with Other Materials

More mold-resistant than paint and natural stone; these comparisons highlight the advantages.

Anti-mold performance is a key advantage. Qinglong UHPC technology is well suited to humid regions.