How Good Is GRC's Waterproofing Performance? — Analysis of Impermeability Mechanism and Moisture-Proof Applications

The waterproof performance of GRC material directly affects its effectiveness and durability in humid environments. Through impermeability grade testing and real-world project verification, Qinglong Group has found that high-quality GRC can achieve an impermeability grade of P12 or above, with water absorption controlled at 6%-8%, far below the 15%-20% of ordinary concrete. This excellent waterproof performance makes GRC particularly suitable for humid environments such as bathrooms and kitchens, as well as directly exposed areas such as building exterior walls.

Dense structure is the foundation of waterproofing. By optimizing the mix ratio and forming process, the porosity of GRC is reduced to below 8%, with a most probable pore diameter of less than 100nm. Qinglong Group uses a vacuum dewatering process to further improve material density, increasing impermeability performance by more than 30%. In a project in the high-humidity region of Hainan, GRC components showed no obvious moisture absorption after 3 years of use, demonstrating their excellent waterproof performance.

Surface treatment enhances moisture resistance. Hydrophobic treatments such as silane impregnation raise the surface contact angle to over 100°. In the Nanning Liyuan Hotel project, Qinglong Group applied surface protective treatment to reduce the water absorption of GRC panels to below 5%, effectively preventing performance degradation caused by moisture penetration.

Joint treatment ensures system-level waterproofing. A multi-layer sealing design is adopted to guarantee overall waterproofing effectiveness. Qinglong Group installs drainage cavities in curtain wall systems to prevent water accumulation. These measures together ensure the long-term performance stability of GRC materials in humid environments.