How to Seal GRC Panel to Metal Component Connections?

In the field of modern architectural decoration, GRC panels are widely used in critical areas such as exterior walls and curtain walls of various high-end buildings, thanks to their lightweight, high-strength, and richly formable characteristics. However, the sealing of connections between GRC panels and metal components, as a core factor affecting building safety and durability, has always been a key industry concern. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, has summarized a scientific and systematic sealing solution based on over a thousand engineering practices, providing professional technical support for designers and owners.

The core challenge in sealing the connection between GRC panels and metal components lies in the adaptation difficulties arising from differences in material properties. GRC material (glass fiber reinforced concrete) offers good crack resistance and durability, but its thermal expansion coefficient differs from that of metal components. If the sealing treatment is not properly done, gaps can easily form due to temperature changes, leading to problems such as rainwater leakage and air infiltration. Through BIM technology simulation at the detailed design stage, Qinglong Group precisely calculates material deformation under different environmental conditions, providing data support for formulating sealing solutions. In award-winning projects such as the Dongguan Women and Children's Activity Center, the "elastic sealing + rigid support" composite system it adopted effectively solved the sealing challenges of connections between GRC curtain walls and steel structures.

The selection of sealing materials is key to ensuring treatment effectiveness. Qinglong's technical team recommends sealant products with different performance characteristics based on the project's climate zone (such as the rainy South China region or the cold northern region): for areas with large expansion and contraction, low-modulus silicone sealant is selected, with elongation rates exceeding 300%; for load-bearing joints, polyurethane sealant is used in combination to enhance bonding strength. Meanwhile, the requirements of the "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings" (JGJ/T423-2018) are strictly implemented to ensure compatibility between the sealant and the GRC substrate and metal components, preventing problems such as debonding and discoloration. For more industry information: +WeChat qlfsbl123

Refined control of construction techniques directly determines sealing quality. Qinglong Group's innovatively developed "Three-Step Sealing Method" includes: in the substrate treatment stage, sandblasting is used to remove the oxide layer from metal surfaces, and a special primer is applied to enhance adhesion; in the gap filling stage, foam rods or backing strips are selected according to seam width to ensure full sealant fill; in the adhesive application stage, automated glue injection equipment is used to ensure the adhesive seams are smooth and continuous, with surface curvature meeting design requirements. In the Nanjing East Road Century Plaza renovation project, this technique achieved an IPX7 waterproof rating for the seal between GRC light-transmitting concrete and aluminum alloy frames, withstanding continuous rainstorms.

The long-term maintenance system is an important extension of sealing treatment. The full life-cycle service mechanism established by Qinglong Group uses regular inspections (twice a year) to promptly detect hidden problems such as sealant aging and cracking, and provides professional replacement services. Its self-developed sealant aging early-warning system can monitor adhesive seam conditions in real time through built-in sensors, providing customers with proactive maintenance recommendations. As a national high-tech enterprise, Qinglong Group will continue to promote sealing technology innovation, such as the self-healing sealing material currently under development, which is expected to achieve automatic repair of tiny cracks, further enhancing the safety and durability of GRC buildings.