What Are the Consequences of Not Applying Anti-Rust Treatment to Embedded Rebar After Welding? A Detailed Look at Potential Hazards and Preventive Measures

Negligence in concealed works can become a "time bomb" for building safety. In the application of new architectural decorative materials such as UHPC/GRC/GRG/GRP, every detail of workmanship bears on the durability and safety of the building.

In construction projects, steel reinforcement serves as the "backbone" of core load-bearing structures, and its anti-corrosion treatment directly affects the building's lifespan. Especially during the installation of new decorative materials such as UHPC (Ultra-High Performance Concrete), GRC (Glass Fiber Reinforced Concrete), GRG (Glass Fiber Reinforced Gypsum), and GRP (Glass Reinforced Plastic, commonly known as fibreglass), the rust-proofing treatment of welded embedded steel bars is often overlooked, yet it may hide major hazards. As the Qinglong Group with 28 years of experience in detailed design, manufacturing, construction and installation, we draw on whole-chain service practice to provide an in-depth analysis of the potential risks of this concealed work and scientific prevention solutions.

I. The Chain Reaction of Embedded Steel Bar Corrosion: From Structural Hazards to Economic Losses

Welded steel bars without rust-proofing treatment are highly prone to oxidation and corrosion in humid, acidic or alkaline environments. The volume expansion caused by corrosion can crack the surrounding UHPC/GRC matrix and weaken the load-bearing capacity of components. A landmark project once suffered partial ceiling detachment due to corrosion of steel bars embedded in a GRG suspended ceiling, causing rework losses and delaying the schedule by as much as 30 days. When undertaking a commercial complex project in Southeast Asia, Qinglong detected a similar hidden danger through early-stage inspection and promptly applied sandblasting rust removal plus epoxy resin coating, avoiding millions in later repair costs.

II. Key Anti-Rust Technical Points for UHPC/GRC/GRG/GRP Material Systems

Different materials have differentiated requirements for steel bar rust prevention: UHPC's ultra-high density can delay corrosion, but welded areas still require galvanizing; GRC components are mostly exposed outdoors and need dual protection with hot-dip galvanizing plus zinc-rich primer; GRG, as an interior material, can use environmentally friendly passivating agents; GRP is inherently corrosion-resistant, but its internal steel frame requires phosphating treatment. Qinglong's production base is equipped with automated rust-removal production lines and uses BIM technology to simulate corrosion risk points, ensuring that every welded joint meets the highest protection level of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018).

III. Whole-Chain Prevention and Control: Qinglong's Solution from Design to Maintenance

As a national high-tech enterprise, Qinglong has established a four-dimensional prevention and control system of "design-production-construction-maintenance": parametric modeling at the design stage avoids rust risks from water accumulation; the production process implements an assembly-line operation of "welding-rust removal-coating"; during construction, 3D scanning positioning ensures protective layer thickness; after-sales maintenance provides corrosion monitoring services for up to 15 years. In the Century Plaza renovation project on Nanjing East Road, Qinglong applied UHPC translucent concrete technology to simultaneously achieve structural load-bearing and decorative effects, and its embedded steel bar anti-rust process won the "Silver Award of the First UHPC Construction Engineering Innovation Award".

No aspect of building safety is trivial—the quality of concealed works directly reflects a company's professional strength. Guided by the mission of "creating beautiful architecture," Qinglong Group transforms 28 years of industry experience into meticulous control over every welded joint. Whether it is GRC exterior wall moldings for real estate projects or GRP daylighting roof canopies for municipal engineering, we always adhere to the principle of "meticulous care and constant pursuit of excellence," providing designers and owners with full-cycle expert services from material selection to lifetime maintenance, making every project a safe work of art that stands the test of time.