Analysis of Sealing Treatment Methods and Key Technical Points for Connecting GRC Panels to Metal Components

In the field of modern architectural decoration, GRC panels have become the ideal choice for exterior walls and decorative components of many landmark buildings, thanks to their lightweight, high-strength and versatile shaping properties. However, the sealing of connections between GRC panels and metal components, a critical link affecting building safety and durability, is often overlooked yet directly determines project quality. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group draws on thousands of engineering practices to provide an in-depth analysis of systematic solutions to this technical challenge.

Sealing Failure Risks and Industry Pain Points in GRC Panel-to-Metal Component Connections

In construction projects, the connection joints between GRC panels and metal keels or embedded parts are exposed to the natural environment over the long term and must simultaneously cope with three major challenges: thermal deformation, vibration loads, and water penetration. Traditional sealing methods generally suffer from three problems: ordinary silicone sealant tends to cause interfacial debonding due to insufficient material compatibility; improper control of sealant application thickness leads to cracking; and the absence of anti-corrosion treatment on metal components accelerates rust expansion, ultimately causing GRC panels to crack and leak. A commercial complex project once failed to adopt professional sealing techniques, resulting in exterior wall leakage within one year of completion, with repair costs as high as 15% of the original construction cost.

Four Core Technical Points of Qinglong GRC Sealing Treatment

1. Scientific Matching of the Material System Qinglong's specially developed GRC sealant addresses the difference in thermal expansion coefficients between glass fiber reinforced concrete and metal by adopting a modified polyurethane elastomer formulation with tensile modulus controlled at 0.8-1.2MPa, achieving stable bonding in environments from -40℃ to 80℃. Used together with a dedicated primer for pretreating metal components, adhesion is improved by more than 40%, solving the compatibility problems between traditional sealants and galvanized steel plates as well as aluminum alloy profiles.

2. Refined Joint Detailing Design An innovative "flexible transition + rigid restraint" composite joint reserves a 5-8mm expansion gap between the GRC panel and the metal frame, with built-in water-swelling waterstop strips and backing foam rods forming multiple waterproof barriers. BIM technology simulates thermal deformation to precisely calculate the width-to-thickness ratio of the sealant, ensuring movement capability of ±25% to meet the settlement requirements of large building structures.

3. Standardized Control of Construction Techniques The "three checks and four inspections" construction standard is implemented: base surface treatment must meet the Sa2.5 rust removal standard, and sealant is applied using a "triangular cross-section" technique to ensure the sealant layer is full and free of air bubbles. Qinglong's proprietary two-component dynamic mixing equipment achieves sealant mixing ratio accuracy with error ≤1%, curing time controlled within 24 hours, and efficiency 3 times higher than traditional manual application.

4. Full Life-Cycle Quality Control A full-process traceability system from detailed design to after-sales maintenance has been established, with each connection joint equipped with an RFID chip recording construction parameters and material batches. Backed by Qinglong's nationwide maintenance network, regular sealant aging tests are conducted, with performance guarantee commitments of up to 15 years—50% longer than the industry average.

Qinglong's Strength Behind the Technological Innovation

As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong owns a provincial-level engineering technology center and 58 patented technologies, with its GRC production line annual capacity reaching 600,000 square meters. In the Century Plaza renovation project on Nanjing East Road, the above sealing technologies successfully achieved a seamless connection between translucent concrete and the metal support structure, winning the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award. From domestic landmarks to overseas projects in Southeast Asia, Qinglong has always maintained an attitude of "meticulousness and the relentless pursuit of excellence", providing designers and owners with expert-level solutions from material selection to joint detailing, making every connection a solid guarantee of building safety.