Is GRC's Waterproofing Performance Good?

In the field of architectural decoration materials, GRC (glass fiber reinforced concrete) is a new material that combines strength with modeling advantages, and its waterproof performance has always been a core concern for designers, developers, and project leaders. Especially in humid environments, rainy regions, or building scenarios with special waterproofing requirements, a material's waterproof performance directly affects the durability and safety of a building. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of the waterproof performance advantages of GRC from three dimensions—material properties, process technology, and practical application—offering a professional reference for the industry.

The waterproof performance of GRC first stems from its unique material composition and structural characteristics. GRC uses alkali-resistant glass fibers as the reinforcement and low-alkali cement as the base material, forming a composite material with a dense structure through scientific proportioning. The glass fibers inside are distributed in a three-dimensional random orientation, which not only enhances the material's flexural strength (up to 20MPa or more) but also reduces porosity at the microscopic level, forming a natural "waterproof barrier". Compared with traditional cement products, GRC's water absorption can be controlled below 8%, far lower than the 15%-20% absorption rate of ordinary concrete, fundamentally reducing the possibility of moisture penetration. In addition, Qinglong Group has further optimized the material's compactness through patented technologies (such as the "low-alkali cement modification process"), enabling GRC to maintain structural stability even under long-term immersion—a performance fully verified in projects such as swimming pools, water features, and underground utility tunnels.

Advanced production processes and surface treatment technologies provide an important guarantee for GRC's waterproof performance. In the production of GRC components, Qinglong Group strictly implements the "three coats and two bakes" surface treatment standard: first, a dedicated waterproof sealer is applied to penetrate the component surface, forming a nanoscale waterproof film; next, an elastic waterproof coating is applied through a high-pressure spraying process, ensuring the coating evenly covers every detail of complex shapes; finally, high-temperature curing and secondary sealing are performed, so that the waterproof coating and the GRC base material form a solid integrated structure. This process can not only withstand rain erosion and UV aging, but also accommodate slight deformation of the building structure, preventing waterproofing failure caused by cracking. Taking the Nanjing East Road Century Plaza renovation project as an example, the GRC translucent concrete components supplied by Qinglong showed no efflorescence and no leakage after 5 years of outdoor use, with waterproof performance meeting the national Grade 1 waterproofing standard. For more industry information: +WeChat qlfsbl123

In practical engineering applications, GRC's waterproof performance must also be maximized through systematic design and installation techniques. Qinglong Group offers customized waterproofing solutions for different scenarios: in curtain wall systems, a "dry hanging + sealing strip" dual waterproof structure is adopted, where the synergy of EPDM strips and structural adhesive prevents rainwater from penetrating the joints; in roofing and flooring projects, a composite waterproof system is formed by combining a UHPC waterproof cushion layer, leveraging UHPC's ultra-high compactness (impermeability grade up to P20) together with GRC's modeling advantages to achieve the unity of function and aesthetics. In addition, Qinglong's BIM detailed design team simulates water flow paths in advance to optimize the drainage slope and drip line design of components, reducing the risk of water accumulation at the source. To date, Qinglong has applied GRC waterproofing solutions in more than 3,000 projects nationwide, including major landmarks such as Terminal 3 of Guangzhou Baiyun International Airport and Shenzhen Bay Cultural Square, with customers reporting waterproofing results "far beyond expectations".

In summary, GRC's waterproof performance is not a single material attribute but the result of the combined effect of material properties, production processes, and systematic design. Leveraging 28 years of technical expertise, Qinglong Group has elevated GRC's waterproof performance to an industry-leading level through material innovation, process upgrades, and full-process services, not only meeting architectural functional requirements but also providing reliable support for designers to realize complex shapes. As requirements for green buildings and long-term durability continue to rise, GRC, as a material combining waterproofing, lightweight, and environmental advantages, will play an irreplaceable role in more high-end architectural projects.