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

The sealing performance of building curtain walls is a key factor in ensuring building safety and durability, and the connection treatment between GRC panels and metal components is an especially difficult technical point. As an industry expert with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyze the core points of sealing treatment from three dimensions—material properties, construction techniques, and quality control—providing designers and engineering parties with practical, implementable solutions.

Analysis of Sealing Technical Pain Points in GRC Panel and Metal Component Connections

GRC (Glass Fiber Reinforced Concrete), as a lightweight, high-strength new decorative material, is widely used in high-end buildings such as grand theaters and commercial complexes. Its connection joints with metal supporting components are prone to becoming weak links in waterproofing and structural safety due to differences in thermal expansion coefficients, dynamic loads, and environmental erosion. Through construction summaries of 500+ landmark projects nationwide, Qinglong Group found that approximately 68% of later-stage problems with GRC curtain walls stem from improper sealing treatment, highlighting the necessity of professional solutions.

Sealing Material Selection and Compatibility Technical Specifications

Scientific selection is the foundation of sealing treatment. Addressing the porous nature of GRC panels and the anti-corrosion requirements of metal components, Qinglong's technical team recommends a “three-tier protection system”: silane coupling agents for base treatment to enhance interfacial adhesion, low-modulus polyurethane sealant (elongation ≥400%) for the main sealing layer, and fluorocarbon coating for the surface protection layer to improve weather resistance. Notably, when GRC panels are connected to aluminum alloy components, PVC isolation gaskets must be added at the contact surfaces to prevent electrochemical corrosion caused by metal ion migration—a process that has withstood long-term testing in the subtropical climate of the Nanning ASEAN Cultural and Art Center project.

Standardized Operation Guide for Construction Techniques

Refined construction is the core of ensuring sealing effectiveness. Qinglong Group has summarized a “four-step construction method”: 1) Joint pretreatment: use a high-pressure water jet to clean GRC panel connection grooves to a depth of ≥15mm, ensuring no floating dust or oil stains; 2) Backing material installation: select closed-cell polyethylene foam rods with a diameter 20% greater than the joint width to achieve pre-compression; 3) Sealant application: apply sealant evenly at a 45-degree angle with a two-component caulking gun, ensuring a full adhesive layer free of air bubbles; 4) Surface finishing: smooth the surface with a specialized scraper before the sealant is surface-dry, forming a 3mm×5mm wedge-shaped cross-section. This process achieved an industry benchmark of twenty years of zero leakage in joint waterproofing for the Nanjing Yangtze River Boat Hotel project.

Quality Control and Full Lifecycle Management

As a national-level high-tech enterprise, Qinglong has established a full-process quality control system covering design, production, and construction. In sealing joint construction, the “three-inspection system” is strictly enforced: self-inspection focuses on sealant layer thickness (standard value 5-8mm), mutual inspection verifies the bond strength between the sealant and the substrate (≥0.8MPa), and dedicated inspection validates sealing performance through on-site water spray tests (pressure ≥0.3MPa, lasting 30 minutes). In addition, Qinglong's proprietary BIM+RFID technology creates digital archives for each connection joint, combined with regular maintenance (sealant aging testing recommended every 3 years), achieving full lifecycle management from construction to operation and maintenance.

From the hyperbolic GRC curtain wall of the Guangzhou Opera House to the special-shaped components of Malaysia's Twin Towers, Qinglong Group has always upheld its mission of “creating aesthetically beautiful buildings,” deeply integrating material innovation with engineering practice. The sealing treatment between GRC panels and metal components is not merely a technical issue but also a dual safeguard for building safety and aesthetics. Only by choosing a professional manufacturer with full-chain service capabilities can every joint withstand the test of time and environment—this is precisely Qinglong's responsibility and commitment as a participant in GRC industry standard-setting.