Rust Prevention for Top-Burst Screws in GRC Component Installation: Key Measures and Application Specifications

Rust prevention of expansion anchor screws is no small matter—detail-oriented protection safeguards GRC installation safety. As a critical anchoring component in GRC component installation, expansion anchor screws directly bear the weight of components and external loads, and their rust resistance is vital to the structural safety and service life of GRC curtain walls. As a GRC manufacturer that values installation details, Qinglong draws on extensive project experience to explain the core rust prevention measures and application specifications for expansion anchor screws.

#Measure 1: Select rust-resistant materials to control quality at the source The material of expansion anchor screws is the foundation of rust prevention. Qinglong gives priority to stainless steel expansion anchor screws made of 304 or 316 stainless steel, among which 316 stainless steel offers stronger corrosion resistance and is suitable for harsh environments such as coastal and high-humidity areas. The screws must comply with national standards to ensure material purity and mechanical properties, and inferior carbon steel screws should be avoided. For projects in ordinary environments, hot-dip galvanized expansion anchor screws can be selected, with a galvanized coating thickness of ≥85μm to form an effective protective layer. In the Qiangwei Garden project in Zengcheng, Guangzhou, Qinglong adopted 304 stainless steel expansion anchor screws with rust prevention treatment, and no rust has occurred over years of use.

#Measure 2: Strengthen surface treatment to enhance rust resistance In addition to selecting rust-resistant materials, additional surface treatment can further enhance the rust prevention effect. Qinglong applies multiple treatments to expansion anchor screws: first, rust and oil removal to eliminate surface impurities; then, application of a special rust-inhibiting primer, with a topcoat added on some projects as needed; for exposed screw heads, rust protection caps are installed to avoid direct contact with environmental media. In addition, before installation, the mounting holes must be ensured to be dry and clean, free of moisture and dust, to prevent internal rust after installation.

#Measure 3: Optimize installation joints to block corrosion paths Scientific installation joint design can reduce the risk of rust on expansion anchor screws. Qinglong focuses on three points in joint construction: first, close fit between the mounting hole and the screw, with gaps filled with anti-corrosion sealant to block the entry of moisture and dust; second, anti-corrosion gaskets placed between the screw head and the GRC component to prevent electrochemical corrosion caused by direct contact between metal and concrete; third, drainage channels provided at the joints to avoid rainwater accumulation and reduce the soaking time of screws. In the Fengjingwan GRC project in Nanning, through optimized joint design, the expansion anchor screws have remained rust-free over long-term use, ensuring secure connections.

#Application Specifications: Key Requirements for Construction and Maintenance Standardized construction and regular maintenance are important guarantees for rust prevention. Qinglong requires construction personnel to strictly follow procedures: the screw installation torque must meet standards to avoid thread damage caused by over-tightening; after installation, debris around the joints must be promptly cleaned and sealant reapplied; installation in rainy or high-humidity conditions should be avoided, and if rain occurs after installation, timely protective measures must be taken. During later maintenance, the condition of the screws should be inspected regularly, and rusted or loose screws should be replaced promptly, with increased inspection frequency for projects in coastal areas. The GRC curtain wall of the Dongguan Women and Children's Activity Center has kept its expansion anchor screws in good condition for years through standardized construction and maintenance.

The rust prevention treatment of expansion anchor screws is a detail-oriented aspect of GRC component installation, yet it directly concerns structural safety. Through high-quality material selection, multiple surface protections, scientific joint design, and standardized construction and maintenance, Qinglong provides long-lasting rust protection for expansion anchor screws. Today, as building safety and durability are increasingly valued, refined rust prevention measures will become a key competitive strength for GRC manufacturers, safeguarding the long-term stable use of GRC curtain walls.