Why Steam Curing Enhances UHPC Strength and Density: Mechanism Analysis and Performance Optimization

Details determine project lifespan. The anti-rust treatment of expansion anchor bolts in GRC component installation is the invisible cornerstone ensuring building safety and aesthetics.

In GRC (glass fiber reinforced concrete) component installation projects, expansion anchor bolts serve as the core fasteners connecting components to the main structure, and their anti-rust performance directly affects the durability and safety of the building's decorative 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, the company has developed a systematic anti-rust solution and construction standards.

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

Long-term exposure to outdoor environments makes expansion anchor bolts vulnerable to erosion by rain, humidity, ultraviolet rays, and other natural factors. If anti-rust measures are inadequate, the bolts may corrode, expand, and lose strength, eventually causing GRC components to loosen or even fall off. In one commercial complex project, screw corrosion caused cracking in the exterior wall moldings three years after delivery, 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 more than 15 years, while bolts installed with inferior workmanship generally corrode in less than 5 years.

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

Qinglong Group adopts a "three-layer protection system" to achieve long-lasting anti-rust performance for expansion anchor bolts: the first layer is substrate treatment, using grade 8.8 high-strength galvanized screws with a zinc coating thickness of ≥85μm to ensure basic anti-corrosion capability; 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 in double coverage, 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 from allowing moisture penetration; dust and standing water in the holes must be removed before installation, using 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 tightness or thread damage caused by over-tightening. Notably, in regions with large temperature differences, 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 extending from material selection to after-sales maintenance. Each batch of expansion anchor bolts is accompanied by 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 screw corrosion conditions with endoscopes and, combined with Qinglong's independently 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 the formulation of GRC industry standards.

The anti-rust treatment of expansion anchor bolts may seem minor, yet it is a vital safeguard for the safe service of GRC components. Building 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 relentless pursuit of detail is a vivid embodiment of Qinglong's mission of "Creating Beautiful Architecture".