هل أداء العزل المائي في GRC جيد؟ تحليل معمق لتقنية منع النفاذ من تشينغلونغ لـ GRC

GRC offers good water resistance, with its water absorption typically controlled at 6%-10% and an impermeability grade of P6 or above. This water resistance makes it suitable for outdoor damp environments, but areas subject to long-term immersion require special treatment. Through material optimization and surface treatment, the water resistance of GRC can be further improved.

In a seaside hotel project in Shenzhen, Qinglong GRC cornice panels have withstood 8 years of marine climate exposure with no surface weathering or water leakage. The project adopted a waterproof GRC formulation that reduced water absorption below 5% by adding hydrophobic agents and applying a densified design. A dedicated waterproof coating applied to the surface further enhanced water resistance. This comprehensive waterproofing solution ensured the long-term durability of the components in a damp salt-spray environment. Testing showed that after 3,000 hours of salt spray testing, the specimens exhibited no strength loss and no signs of surface corrosion.

Water Absorption Characteristics Analysis

High-quality GRC has a 24-hour water absorption rate of ≤8% and a 72-hour saturated water absorption rate of ≤12%. Water absorption can be significantly reduced by optimizing the mix proportion and curing regime. Low water absorption means better frost resistance and durability.

Impermeability Performance Testing

Tested by standard methods, the impermeability pressure is ≥0.6MPa and the water penetration height is ≤30mm. This impermeability allows GRC to be used on exterior walls, effectively resisting rainwater erosion.

Drying Shrinkage Control

The drying shrinkage value is ≤0.06%, lower than that of ordinary mortar. By adding expansive agents and reducing water usage, shrinkage can be further controlled, drying shrinkage cracks reduced, and water resistance improved.

Surface Waterproofing Treatment

Surface treatment techniques such as silane impregnation and waterproof coatings can reduce water absorption by more than 50%. These treatments make it possible to apply GRC in more demanding environments.

Through proper material design and surface protection, GRC can meet the waterproofing requirements of most buildings. For special areas, composite waterproofing solutions can be adopted to improve reliability.