Analysis of Anti-Rust Measures and Application Points for Top-Burst Screws in GRC Component Installation

Details Determine Quality, Anti-Rust Protection Safeguards Safety — The Long-Term Protection Approach for GRC Component Expansion Anchor Screws

In GRC (Glass Fiber Reinforced Concrete) component installation projects, expansion anchor screws serve as the core anchoring components connecting components to the main structure, and their anti-rust performance directly affects the safety and durability of architectural decoration. Especially in complex environments such as humid, high-temperature, or coastal areas, screw corrosion not only compromises structural stability but may also lead to safety hazards such as component detachment. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on over a thousand engineering projects to provide an in-depth analysis of the technical essentials and application logic of anti-rust measures for expansion anchor screws, offering professional solutions for designers, owners, and contractors.

### I. Potential Risks and Industry Pain Points of Expansion Anchor Screw Corrosion in GRC Components

GRC components, with their advantages of light weight, high strength, and flexible shaping, are widely used for exterior wall cladding panels and decorative moldings in high-end projects such as grand theaters, commercial complexes, and landmark buildings. As key nodes of concealed works, expansion anchor screws are exposed to outdoor environments for long periods and are susceptible to rain, ultraviolet rays, corrosive gases, and other factors. Market research shows that approximately 30% of post-installation maintenance issues with GRC components stem from screw corrosion — at best causing component loosening and deformation, and at worst triggering safety accidents. Traditional anti-rust treatments, due to crude workmanship and improper material selection, often fail to meet engineering warranty requirements of 15 years or more, making this a widespread technical challenge across the industry.

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

Based on full-chain technical expertise, Qinglong Group has developed a systematic anti-rust solution with full-process control from material selection to construction techniques:

**1. Scientific Selection of High-Performance Coating Materials** Prioritize the hot-dip galvanizing + Dacromet composite coating process, with a zinc layer thickness of 85μm or more and salt spray test endurance exceeding 1,000 hours, delivering 3 times the anti-rust capability of ordinary electro-galvanizing. For coastal environments with high salt spray, the solution can be upgraded to zinc-nickel alloy coatings combined with sealant treatment, extending the anti-rust period to over 20 years. Material selection must comply with the “Electroplated Coatings on Fasteners” (GB/T 5267.1) standard to ensure coating uniformity and adhesion strength.

**2. Refined Anti-Rust Techniques for On-Site Installation** Before installation, mechanically derust and dedust the screw holes, and coat the hole interiors with a specialized anti-rust primer (such as epoxy zinc-rich primer) with a dry film thickness of no less than 60μm. After the screws are tightened, immediately apply silicone sealant at the contact points between the nuts and the components to form a waterproof barrier, and seal exposed nuts with stainless steel caps or anti-rust putty to prevent moisture intrusion. Qinglong's construction team pioneered the “Three-Layer Protection Method” — coating protection + sealant protection + physical barrier protection — which has been verified by key projects such as the Nanjing East Road Century Plaza renovation, with remarkable anti-rust results.

**3. Customized Treatment Strategies for Special Environments** For freeze-thaw cycle issues in severe cold regions, low-temperature flexible anti-rust materials are used to prevent protective layer cracking caused by material embrittlement; in corrosive environments such as chemical industrial parks, PTFE (polytetrafluoroethylene) coated screws are selected, combined with sacrificial anode protection technology to form an active anti-rust system. Qinglong's technical center can provide material compatibility test reports based on project environmental parameters to ensure the scientific soundness of each solution.

### III. Key Quality Control Points for Anti-Rust Work in GRC Installation

As a participating drafter of the “Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)” (JGJ/T423-2018), Qinglong Group emphasizes full-process quality control: - **Incoming Material Inspection**: Each batch of screws must come with coating inspection reports and salt spray test reports, with sampling conducted for adhesion testing; - **Construction Process Supervision**: BIM technology is used to pre-plan screw installation positions, ensuring even load distribution and preventing coating damage caused by stress concentration; - **Clear Acceptance Criteria**: Anti-rust treatment must meet the concealed works acceptance requirements of the “Standard for Construction Quality Acceptance of Building Decoration” (GB 50210), with photographic records and test data retained.

### IV. Qinglong Group's Full-Chain Service Advantages

From anti-rust solution optimization in the detailed design stage, to material quality control in manufacturing, and to the implementation of techniques in construction and installation, Qinglong Group relies on its national-level R&D center and 600,000-square-meter production base to achieve full-chain coordination of “design-production-construction-maintenance”. Differentiated anti-rust solutions are provided according to the distinct material characteristics of GRC/GRG/UHPC — for example, GRG indoor ceiling screws use an electrophoretic coating process, balancing anti-rust performance with aesthetics; UHPC components, bearing heavier loads, use high-strength anti-rust screws combined with shear connector designs. In 2024, the industry standard “General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)”, which Qinglong participated in drafting, further standardized the anti-rust technical requirements for anchoring systems, driving an upgrade in industry quality.

[Summary] The anti-rust treatment of expansion anchor screws in GRC components is the “invisible line of defense” for architectural decoration safety. Supported by 28 years of professional experience, Qinglong Group deeply integrates materials science with engineering practice, laying a solid foundation of quality for every project through technological innovation and refined management. Looking ahead, Qinglong will continue to explore new anti-rust materials and techniques, fulfill its mission of “Creating Beautiful Architecture”, and provide more reliable, longer-lasting solutions for the global architectural decoration industry.