What Are the Anti-Rust Measures for Top-Burst Screws in GRC Component Installation: Analysis of Implementation Points

In GRC component installation projects, expansion anchor screws serve as the key nodes connecting the structure and the components, and their anti-rust treatment directly affects the durability and safety of architectural decoration. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, has drawn on the practice of hundreds of landmark projects to develop a systematic anti-rust solution, providing professional technical support for designers and owners.

Hazards of Expansion Anchor Screw Corrosion in GRC Components and the Protection Logic

After installation, expansion anchor screws are long-term exposed to outdoor environments, facing multiple challenges such as rain erosion, wet-dry cycling, and ultraviolet exposure. Ordinary carbon steel screws without anti-rust treatment typically develop corrosive expansion within 1-2 years, causing gaps between GRC components and the substrate, and in severe cases, posing a risk of detachment. Through comparative experiments, the Qinglong technical team found that screws treated with standard anti-rust processes can have their service life extended to more than 15 years, basically matching the design service life of GRC components.

Core Technical Solutions for Anti-Rust Treatment of Expansion Anchor Screws

1. Material Selection: Blocking the Corrosion Path at the Source
316 stainless steel screws are preferred, as their chromium-nickel-molybdenum alloy composition maintains stable performance even in coastal areas with high salt fog. For projects with limited budgets, carbon steel screws with hot-dip galvanizing + passivation treatment may be used; the zinc layer thickness must reach 85μm or more, and the screws must pass 500 hours of neutral salt spray testing without red rust. Qinglong's production base is equipped with a material testing laboratory that can conduct spot checks on incoming screws for coating adhesion and corrosion resistance.

2. Surface Treatment: Building Multiple Protective Barriers
Before installation, apply a nano-grade ceramic anti-rust agent to the screw threads to form a 0.5-1μm protective film that provides both lubrication and corrosion protection. For screws that are already installed, EPDM rubber gaskets should be added at the contact points between the screw nuts and the components to prevent electrochemical corrosion. Qinglong's detailed design team will clearly specify gasket specifications and installation process requirements in the construction drawings.

3. Joint Sealing: Isolating External Corrosive Media
After the screws are fixed, use two-component silane-modified polyether sealant for joint sealing, with a sealant layer width of no less than 10mm and a thickness of no less than 5mm. For components with complex shapes such as European-style mouldings, Qinglong's construction team adopts a composite treatment process of “sealant + waterproof mortar” to ensure water tightness while maintaining the decorative effect.

Implementation Points and Quality Control of Anti-Rust Construction

1. Installation Environment Control
Avoid installing screws on rainy days or when air humidity is >85%. If rain occurs during construction, unsealed screws must be immediately wrapped for temporary protection. Qinglong's project management team will formulate flexible construction plans based on meteorological data to ensure that anti-rust treatment is completed in a dry environment.

2. Standardized Process Operations
Follow the standardized process of “one tightening, two coating, three sealing”: first tighten the screws with a torque wrench according to design values (usually controlled at 35-45N·m), then apply the anti-rust agent and let it stand for 15 minutes, and finally perform the sealing treatment. Each process step must be signed off by a quality inspector, forming traceable quality records.

3. Later-Stage Maintenance and Monitoring
At completion acceptance, use a borescope to inspect concealed joints for anti-rust quality; during the service period, conduct an appearance re-inspection every 3 years, focusing on whether rust penetration appears around the screws. Qinglong's after-sales team can provide professional maintenance assessment services to promptly identify and address potential corrosion hazards.

As a participant in setting GRC industry standards, Qinglong Group has always taken detailed craftsmanship as the core of quality control. The anti-rust treatment of expansion anchor screws may seem minor, but it is a key link in ensuring the safety and durability of GRC components. Through the systematic combination of materials science and construction techniques, increased maintenance costs caused by corrosion can be effectively avoided, truly fulfilling the corporate mission of “Creating Beautiful Architecture”. Whether for the complex curtain wall systems of grand theaters or the irregular decorative components of commercial complexes, rigorous anti-rust craftsmanship is an important cornerstone of GRC engineering quality.