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 factor affecting building durability and safety, and the joint treatment between GRC panels and metal components is a particular technical challenge. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has summarized a systematic sealing treatment solution based on the practice of hundreds of landmark projects, balancing waterproofing, seismic resistance, and aesthetics, providing professional technical reference for designers and owners.

Core Sealing Technology for GRC Panel-to-Metal Component Joints: Material Selection and Structural Design

At the joints between GRC panels and metal keels, the selection of sealing materials must meet both elastic deformation capacity and weather resistance requirements. The Qinglong technical team recommends a composite solution of ethylene propylene diene monomer (EPDM) rubber sealing strips combined with silicone structural sealant: EPDM strips can absorb the linear expansion of GRC panels caused by temperature changes (typically 0.012mm/℃), while silicone sealant forms a durable bond at metal interfaces, with its tensile modulus controlled between 0.4-0.6MPa to ensure no peeling occurs under seismic loads. An exhibition center project achieved ±50mm displacement compensation with this solution, with no leakage problems after 8 years of use.

Full-Process Construction Control: A Quality Closed Loop from Detailed Design to On-Site Installation

The construction quality of sealing treatment depends on refined process management. Qinglong uses BIM technology for joint pre-assembly, simulating the three-dimensional relationship between GRC panels and metal components in advance to ensure uniform sealant joint width (recommended value 8-12mm). During the on-site installation stage, the "three-inspection system" is strictly enforced: base treatment must meet the Sa2.5 rust removal standard, silicone-free isolation strips are used for positioning before sealant joint filling, and sealant is applied at a constant 45-degree angle to ensure a full adhesive layer free of air bubbles. Through this standardized construction, a commercial complex project in Nanning increased the first-pass acceptance rate of sealed joints to 98%.

Addressing Special Conditions: Sealing Enhancement Technology for High-Temperature and High-Humidity Environments

For the high-temperature and high-humidity environment of South China, Qinglong has developed a customized sealing enhancement process: applying a polyimide primer on metal component surfaces to increase sealant adhesion by up to 30%; using water-swelling waterstops combined with backer foam rods to form a dual waterproof barrier; and applying rounded corner treatment to GRC panel edges (radius ≥5mm) to prevent stress concentration from causing sealant cracking. This technology was successfully applied in a landmark project in Malaysia, withstanding an average annual humidity of 90%.

Industry Standards and Qinglong Practice: From Technological Innovation to Standard Leadership

As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong has incorporated its sealing treatment technology into the corporate standard Q/QL 008-2023, which clearly specifies sealing material selection guidelines and construction acceptance specifications for different climate zones. Comparative experimental data show that joints using Qinglong's sealing process achieve water tightness meeting Level 8 requirements of the GB/T 15227-2019 standard and air permeability performance of Level 7, exceeding the industry average.

From materials science to engineering practice, the sealing treatment of GRC panels and metal components is the crystallization of technology and experience. With 28 years of professional expertise, Qinglong Group has elevated sealed joints from simple waterproof structures to vital safeguards for building safety, giving every architectural work longer-lasting vitality through an integrated "design-materials-construction" solution. In the future, with the widespread application of UHPC/GRC composite components, Qinglong will continue to drive innovative development in sealing technology, setting higher standards for the industry.