Analysis of Sealing Treatment Methods and Construction Key Points for GRC Panel to Metal Component Connections

The sealing performance of building curtain walls is a key indicator of engineering quality, and the connection treatment between GRC panels and metal components is a core factor affecting system stability and durability. As an industry-leading enterprise with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has developed a scientific and systematic sealing treatment solution through full-chain technical accumulation, which ensures both the physical performance of buildings and the realization of design aesthetics.

**Sealing Technology Principles for GRC Panel-to-Metal Component Connections**
GRC (glass fiber reinforced concrete), as a new lightweight and high-strength decorative material, requires its connection joints with metal components to simultaneously address thermal deformation, structural displacement, and water tightness requirements. Based on the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong's technical team has innovatively adopted a composite treatment process of "flexible sealing + rigid fixing": elastic sealant absorbs the thermal expansion and contraction stress of GRC panels, while custom metal connectors ensure structural stability, forming a dual protection system. Compared with traditional rigid connections, this treatment method can reduce the risk of joint cracking by more than 30%, and it has been verified under long-term outdoor conditions in projects such as the Dongguan Women and Children's Activity Center.

**Scientific Selection Strategy for Sealing Materials**
Material selection directly determines the durability of the sealing effect. Qinglong recommends differentiated configuration based on project environmental characteristics: in humid and rainy regions, silicone weather-resistant sealant is preferred, as its temperature resistance range of -40°C to 150°C and service life of over 20 years can effectively resist rainwater erosion; for northern regions with drastic temperature differences, polyurethane foam should be used to fill gaps in the base layer, forming a "cushioning-sealing" composite barrier. It is particularly noteworthy that the porosity of the GRC panel surface must be controlled within 8%, and a special primer should be used for pretreatment when necessary to ensure that the bonding strength between the sealant and the substrate reaches the standard of 0.8MPa or above.

**Key Construction Control Points and Quality Management**
Standardized construction procedures are the core of ensuring sealing quality. Qinglong's detailed design team uses BIM technology to simulate the stress state of joints and has formulated the "three checks and four inspections" construction specification: checking the flatness of the base layer, checking the anti-corrosion treatment of metal components, and checking the sealant joint dimensions; inspecting the caulking gun pressure, application speed, curing time, and sealant fullness. In the Nanjing East Road Century Plaza renovation project, three-dimensional laser scanning positioning technology enabled millimeter-level precise alignment between GRC translucent panels and steel structural keels, with sealant joint errors controlled within ±0.5mm, ensuring the water tightness and aesthetics of the overall curtain wall.

**Full Life-Cycle Sealing System Maintenance Plan**
High-quality sealing treatment requires long-term maintenance mechanisms. Qinglong has established a full-chain service system covering detailed design, manufacturing, construction and installation, and after-sales maintenance, providing five years of free maintenance services for GRC-metal connection joints. Owners are advised to conduct a sealant joint integrity inspection every two years during use, with a focus on sealant aging at corner areas and expansion joints. For super high-rise buildings, drone inspection combined with thermal imaging technology can be adopted to promptly identify potential sealing failure risks and prevent structural corrosion problems caused by rainwater leakage.

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise and a participant in formulating GRC industry standards, Qinglong has always taken "creating beautiful architecture" as its mission, transforming 28 years of engineering experience into replicable technical solutions. From material selection to construction techniques, from quality management to after-sales maintenance, every step reflects the professional attitude of "meticulousness and constant improvement". In the future field of architectural decoration, Qinglong will continue to drive the innovative development of GRC and metal connection technologies, providing more valuable systematic solutions for designers and owners, allowing architectural beauty to flourish with lasting vitality in every detail.