Analysis of Anti-Rust Treatment Methods and Construction Key Points for GRC Curtain Wall Connections with Steel Structures

The durability and safety of building curtain walls often depend on craftsmanship control at the details. In the connection joints between GRC curtain walls and steel structures, anti-rust treatment is the key process for protecting the building's "bones". As an industry player with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group will systematically explain the technical essence of anti-rust treatment—from material properties and process standards to construction essentials—providing designers and owners with solutions that stand the test of time.

Corrosion Risks and Material Properties of GRC Curtain Wall–Steel Structure Connections

GRC (Glass Fiber Reinforced Concrete) is widely used in high-end buildings such as grand theaters and commercial complexes, thanks to its light weight, high strength, and flexible shaping. Its connection joints with steel structures are exposed to complex environments of alternating wet and dry conditions and temperature changes. Improper anti-rust treatment not only compromises structural safety but also shortens the service life of the curtain wall system. Qinglong Group addresses material compatibility as early as the detailed design stage—the alkaline environment of GRC components can accelerate steel corrosion, while the thermal expansion and contraction of steel structures can damage the protective layer. This "inherent contradiction" requires anti-rust solutions to be highly targeted.

Core Anti-Rust Treatment Processes: From Surface Preparation to Coating Protection

Professional anti-rust treatment must follow a "three-tier protection system". First is surface treatment: sandblasting removes rust to the Sa2.5 standard, ensuring the steel structure surface is free of mill scale, rust, and oil stains, creating an ideal substrate for coating adhesion. Qinglong's production base is equipped with automated sandblasting equipment that precisely controls surface roughness at 50-80μm, meeting the application requirements of different coating systems. Second is coating selection: given the characteristics of GRC curtain walls, a composite system of epoxy zinc-rich primer + epoxy micaceous iron oxide intermediate coat + fluorocarbon topcoat is recommended, with a total dry film thickness of no less than 180μm. The zinc-rich primer contains ≥80% zinc, providing sacrificial anode protection. Finally comes joint sealing: silicone structural sealant combined with anti-corrosion gaskets provides dual protection, eliminating the hidden risk of rust caused by rainwater penetration.

Quality Control Points During Construction and Qinglong's Full-Chain Advantages

The construction quality of anti-rust treatment directly determines the protective outcome. Qinglong strictly implements a "three-inspection system" during project execution: before each shift, sandblasting equipment pressure and abrasive grain size are checked to ensure rust removal meets standards; during the process, coating wet film thickness and adhesion are tested, with sampling every 200㎡; after completion, spark detection is carried out, and the next process may proceed only when no defects are found. As a national high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong achieves seamless coordination from material selection and joint detailing to on-site construction. For example, in the Dongguan Women and Children's Activity Center project, BIM technology was used to simulate the thermal expansion displacement of the steel structure, optimizing the elastic design of the anti-rust coating in advance to ensure stable performance over a 15-year protection period.

Long-Term Maintenance and Industry Standard Practices

Anti-rust treatment is not a one-time solution—regular maintenance is key to extending service life. Qinglong recommends the first coating inspection within 3 years after completion, focusing on stress-concentration areas such as connection joints and corners, with localized damage treated through local sandblasting plus repair coatings. As a contributing editor of the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings, Qinglong's anti-rust processes strictly comply with JGJ/T423-2018 requirements. Its Nanning production base has an annual capacity of 600,000 square meters, ensuring consistent supply of protective materials and construction quality for large-scale projects.

From materials science to engineering practice, the anti-rust treatment of GRC curtain walls and steel structures is the crystallization of technology and experience. Built on 28 years of industry accumulation, Qinglong Group embeds its commitment of "meticulous care and constant refinement" into every connection joint, dressing buildings in lasting "protective armor". In the field of new architectural decorative materials, only by perfecting detail craftsmanship can the mission of "creating aesthetic architecture" truly be fulfilled.