How Good Is GRC's Waterproofing Performance? An In-Depth Analysis of Qinglong GRC Waterproofing Technology

GRC materials, through proper mix ratio design and surface treatment, can achieve excellent waterproofing performance. High-quality GRC can have its water absorption rate controlled at 6%-10%, with an impermeability grade of P6 or above, fully meeting the waterproofing requirements of building exterior walls.

In the Shenzhen Bay Super Headquarters Base project, the Qinglong GRC curtain wall system withstood continuous rainstorms, demonstrating outstanding waterproofing performance. The waterproof GRC formula used in the project reduced the material's water absorption rate to below 8% by adding silane-based waterproofing agents (dosage 0.3%-0.5%) and optimizing the water-cement ratio (0.3-0.35). Meanwhile, the component joints feature a triple waterproofing design: structural adhesive sealing, water drainage channels, and a pressure equalization system, forming a complete waterproofing system. After three rainy seasons of testing, no leakage was found on the inner side of the curtain wall system, and the waterproofing effect was highly recognized by the owner. Permeability coefficient testing shows a value of 1×10⁻¹²m/s, making it virtually impermeable.

Inherent Material Waterproofing Performance

By reducing the water-cement ratio and adding waterproofing agents, the material's water absorption rate is controlled below 10%. Optimized particle grading improves density and reduces capillary channels. This material-level waterproofing provides the fundamental safeguard, ensuring no leakage during long-term use.

Surface Waterproofing Treatment Technology

Penetrating waterproof coatings are applied to form a hydrophobic layer. The surface coating bonds firmly with the substrate and offers good durability. Regular maintenance can maintain long-term waterproofing effectiveness. After surface treatment, the water absorption rate is reduced to below 3%.

Joint Waterproofing System Design

Multiple waterproofing barriers are adopted to ensure reliable joint sealing. A water drainage system is installed to discharge any water that may seep in. This systematic design improves overall waterproofing reliability, reducing the joint leakage rate to below 0.1%.

Long-Term Waterproofing Performance Verification

Verified by more than 5 years of actual use, the waterproofing effect is long-lasting. Regular inspection and maintenance can maintain long-term waterproofing performance. This verification provides a basis for design and ensures project safety.

The waterproofing performance of GRC needs to be ensured through multiple aspects, including materials, construction details, and installation. Systematic design and high-quality products are the guarantee of successful waterproofing. It is recommended to conduct water spray tests on critical areas to verify the waterproofing effect.