Anti-Rust Measures and Key Installation Points for Top-Burst Screws in GRC Components

Details determine the lifespan of a project. The anti-rust treatment of expansion bolts in GRC component installation is an invisible cornerstone that safeguards both building safety and aesthetics.

In GRC (Glass Fiber Reinforced Concrete) component installation projects, expansion bolts serve as the core fasteners connecting components to the main structure, and their rust resistance directly affects the durability and safety of the architectural decoration system. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the critical role of anti-rust treatment in construction. Drawing on the practice of more than one hundred landmark projects, it has developed a systematic anti-rust solution and construction standard.

Hazards of Expansion Bolt Corrosion in GRC Components and Industry Pain Points

Expansion bolts are exposed to outdoor environments for long periods and are vulnerable to erosion by natural factors such as rain, humidity, and ultraviolet rays. If anti-rust measures are inadequate, the bolts may corrode, expand, and lose strength, ultimately causing GRC components to loosen or even fall off. One commercial complex project experienced cracking of exterior wall moldings 3 years after delivery due to bolt corrosion, which not only increased maintenance costs but also posed risks to building safety. Through follow-up research on more than 200 GRC projects nationwide, Qinglong's technical team found that standardized anti-rust treatment can extend bolt service life to over 15 years, while bolts installed with poor workmanship generally corrode in less than 5 years.

Core Technical Solutions for Anti-Rust Treatment of Expansion Bolts

Qinglong Group adopts a "three-layer protection system" to achieve long-lasting rust prevention for expansion bolts: The first layer is base material treatment, using Grade 8.8 high-strength galvanized screws with a zinc coating thickness of ≥85μm to ensure fundamental corrosion resistance; the second layer applies mechanical galvanizing plus passivation, achieving 500 hours without red rust in salt spray tests; the third layer, applied after installation, uses Qinglong's specially formulated epoxy zinc-rich primer plus fluorocarbon topcoat as a double coating, forming a physical isolation barrier. For coastal high-humidity environments, an additional process of applying polytetrafluoroethylene sealant to the threaded sections further enhances waterproof performance.

Key Anti-Rust Control Points in GRC Installation and Construction

Refined operations during construction are an important guarantee of anti-rust effectiveness. Qinglong's construction specifications require: drilling depth deviation must be controlled within ±2mm to prevent excessive gaps between the screw and the hole wall that allow moisture infiltration; before installation, dust and standing water in the hole must be removed through a dual cleaning process of compressed air blowing plus anhydrous ethanol wiping; a torque wrench must be used when tightening screws to ensure the preload reaches 85%-95% of the design value, preventing moisture ingress caused by insufficient tightening or thread damage caused by over-tightening. Notably, in regions with large temperature variations, buffer space must be reserved for the thermal expansion and contraction of screws to prevent metal fatigue from accelerating corrosion.

Full Life-Cycle Anti-Rust Management and Quality Traceability

As a national high-tech enterprise, Qinglong has established a full-process traceability system covering everything from material selection to after-sales maintenance. Each batch of expansion bolts comes with material certificates and anti-rust treatment test reports, and BIM technology is used during construction to record screw installation coordinates and torque parameters. For completed projects, Qinglong provides 10 years of regular inspection services, checking bolt corrosion conditions with endoscopes and, combined with Qinglong's self-developed anti-rust repair materials, achieving closed-loop management of "prevention - monitoring - repair." This full-chain service capability enables Qinglong to continue playing a leading role in setting GRC industry standards.

Though seemingly minor, the anti-rust treatment of expansion bolts is an essential guarantee for the safe service of GRC components. Built on 28 years of professional experience, Qinglong Group deeply integrates materials science with engineering practice, providing designers and owners with GRC system solutions that combine safety and durability through technological innovation and refined management. In the future of architectural decoration, this ultimate pursuit of detail is a vivid embodiment of Qinglong's mission to "Create Beautiful Architecture."