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

The beauty of architecture begins with details. In the installation of GRC components, the anti-rust treatment of expansion bolts may seem minor, yet it directly affects the durability and safety of architectural decoration. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group understands the importance of every construction detail to project quality. This article systematically analyzes the key technical points of anti-rust treatment for expansion bolts during GRC component installation—from anti-rust mechanisms and implementation processes to quality control—providing professional solutions for designers, owners, and construction units.

Hazards of Expansion Bolt Corrosion in GRC Components and the Necessity of Protection

In the installation of GRC exterior wall panels, decorative lines, and other components, expansion bolts serve as core connectors exposed to outdoor environments over the long term, vulnerable to erosion by rain, humidity, ultraviolet rays, and more. If anti-rust measures are inadequate, this will not only cause bolt strength to decline and components to loosen, but may also allow rust stains to penetrate the GRC surface, severely compromising the building's aesthetics. Laboratory data from Qinglong Group's Nanning production base shows that bolts without anti-rust treatment develop visible corrosion within an average of 2-3 years in coastal high-humidity environments, while projects that implement standardized anti-rust processes can extend service life to more than 15 years.

Core Technical Solutions for Anti-Rust Treatment of Expansion Bolts

Based on Qinglong's 28 years of construction experience, anti-rust treatment of expansion bolts requires a "multiple barriers" technical system. The first is material selection: 316 stainless steel bolts compliant with the GB/T 1221-2021 standard should be given priority; their chromium-nickel-molybdenum alloy composition forms a passivation film with salt spray resistance exceeding 1,000 hours, making them especially suitable for coastal and industrially polluted areas. For ordinary carbon steel bolts, hot-dip galvanizing is required, with a zinc layer thickness of no less than 85μm, and anti-rust grease containing fluorosilane applied to the threads to form dual protection.

The second is construction process control. Qinglong's construction team has summarized a "three-step anti-rust method": after drilling, clean dust from the hole and inject epoxy resin anchoring agent to enhance sealing; degrease the bolt surface before installation to remove oil and impurities; after installation, apply polysiloxane anti-corrosion coating to the bolt head and surrounding areas, with a dry film thickness ≥60μm. This process was applied in the Nanjing East Road Century Plaza renovation project, and five years of follow-up testing showed no bolt corrosion, with the GRC component connection integrity retention rate reaching 98%.

Implementation Points and Quality Control of Anti-Rust Construction

The effectiveness of anti-rust treatment depends heavily on construction details. Qinglong emphasizes a "three checks and three verifications" control mechanism: verify bolt material certificates and coating test reports upon material entry, rejecting substandard products; during construction, check drilling depth, anchoring agent fullness, and coating uniformity, using wet film thickness gauges for real-time monitoring; before completion, conduct salt spray accelerated tests simulating 5 years of natural environmental erosion. In addition, differentiated solutions are developed for different climate zones: low-temperature anti-rust grease is added in severe cold northern regions, and nano-grade ceramic coatings are used in high-temperature, high-humidity southern regions, ensuring adaptability across all regions.

As a national high-tech enterprise and a participant in drafting the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)", Qinglong Group has always made detailed craftsmanship the core of its quality. From anti-rust solution optimization during the detailed design stage, to material screening in production, to standardized operations in construction and installation, a full-chain quality assurance system has been established. As reflected in Qinglong's commitment of "meticulous in every detail, striving for excellence", the anti-rust treatment of every expansion bolt is a key line of defense safeguarding building safety and aesthetics. Choose Qinglong, choose the technical solutions refined by a professional team over 28 years, and let the vitality of GRC components shine together with the building.