Anti-Rust Measures for Expansion Anchor Bolts During GRC Component Installation and Analysis of Key Implementation Points

The vitality of a building lies in the relentless pursuit of detail. In GRC component installation projects, the anti-rust treatment of expansion anchor screws may seem minor, yet it is a critical step in ensuring building safety and aesthetics. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the profound impact of anti-rust technology on project quality. This article systematically analyzes the key technical points and implementation standards for the anti-rust treatment of expansion anchor screws during GRC component installation, providing professional solutions for designers and owners.

The Hazards of Expansion Anchor Screw Corrosion in GRC Components and the Value of Prevention

As the core load-bearing components connecting GRC elements to the main building structure, expansion anchor screws, once corroded, not only weaken structural load-bearing capacity but may also cause components to loosen and fall off, directly threatening building safety. Especially in humid, coastal, or highly polluted environments, screws without anti-rust treatment show obvious corrosion within an average of 2-3 years, while properly implemented anti-rust measures can extend their service life to more than 15 years. In projects such as the renovation of Century Plaza on Nanjing East Road, Qinglong Group achieved coordinated durability between GRC components and metal connectors through systematic anti-rust technology, confirming the engineering value of rust-proofing treatment.

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

Combining physical isolation with chemical protection is the golden rule of anti-rust treatment in GRC installation. Verified through more than 20 years of engineering practice, the Qinglong technical team has developed a standardized treatment system: first, screws undergo hot-dip galvanizing with a zinc layer thickness of at least 85μm, forming the first physical barrier; before installation, a dedicated epoxy zinc-rich primer is applied with a dry film thickness of ≥60μm to further enhance corrosion resistance; for key projects, stainless steel screws (grade 316 or above) can be used together with PTFE washers, achieving more than 20 years of maintenance-free performance in salt-spray environments. In a coastal landmark project, Qinglong adopted this triple protection system, and no corrosion was observed during 5 years of follow-up monitoring.

Key Control Points for Construction Implementation

A standardized construction process is the guarantee of effective rust prevention. Qinglong's construction specifications clearly require: after drilling, dust and moisture inside the hole must be cleaned using double protection of compressed air blowing plus cotton cloth wiping; before screw installation, threads must be checked for integrity to avoid seal failure caused by thread damage; sealing treatment must be carried out within 2 hours after tightening, with a secondary encapsulation using acrylate sealant, and the sealant layer width should be no less than 2 times the screw diameter. In the Dongguan Women and Children's Activity Center project, strict implementation of the three-step method of "hole cleaning - inspection - sealing" achieved a 100% pass rate for anti-rust treatment at GRC component installation joints.

Full Life-Cycle Anti-Rust Management Strategy

Anti-rust treatment is not a one-time fix. Qinglong has innovatively proposed the "full life-cycle rust prevention management concept": during the detailed design stage, an appropriate solution is selected based on the project's environmental grade (e.g., upgrading to grade C5-M for seaside projects); during production, RFID chips record screw batches and anti-rust process parameters; after completion, a dedicated maintenance manual is provided, recommending annual visual inspections and ultrasonic flaw detection every 3 years. This full-chain control from design to maintenance ensured that a commercial complex project in Guangzhou undertaken by Qinglong experienced no component problems caused by screw corrosion throughout its 10-year operation period.

Details determine success or failure, and rust prevention safeguards safety. As a participant in setting GRC industry standards, Qinglong Group has always integrated its commitment to "meticulous care and constant refinement" into every construction detail. From material selection to process innovation, from on-site construction to later-stage maintenance, we are dedicated to empowering buildings through professional technology, making every GRC component a perfect combination of safety and aesthetics. Choose Qinglong, choose the professional assurance built on 28 years of experience, and together create architectural masterpieces that stand the test of time.