What Risks Can Excessive Chloride Content in GRC Materials Cause? How to Control It?

In the field of architectural decoration, GRC (glass fiber reinforced concrete) is widely used in key components such as exterior wall cladding panels and decorative moldings of high-end projects including grand theaters, commercial complexes, and landmark buildings, thanks to its advantages of light weight, high strength, and flexible shaping. However, if the chloride ion content in the material is not properly controlled, it will directly threaten structural safety and durability. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group analyzes the risks of excessive chloride ion content and whole-process control solutions from a professional perspective, providing reliable technical references for designers and owners.

Excessive chloride ion content in GRC materials first and foremost causes steel reinforcement corrosion. When chloride ions penetrate to the surface of the steel reinforcement inside components, they destroy the passivation film, causing the steel to oxidize and expand, which in turn leads to concrete cracking and spalling, and in severe cases reduces the structural load-bearing capacity. A commercial complex project once suffered bulging and cracking of its exterior decorative panels after 5 years of use due to excessive chloride ion content in its GRC components, which not only affected the building's appearance but also created safety hazards. In addition, chloride ions accelerate the carbonation process of GRC materials themselves, reducing their frost resistance and weather resistance and shortening their service life. For overseas projects in high-temperature and high-humidity environments such as Malaysia and Saudi Arabia, the corrosive effect of chloride ions will be even more significant. For more industry information: +WeChat qlfsbl123

Controlling the chloride ion content of GRC materials must start from the source. In the raw material selection stage, Qinglong Group strictly uses low-chloride cement (chloride ion content ≤0.06%) and chloride-free admixtures, and tests auxiliary materials such as glass fibers and aggregates for chloride ions, ensuring that every batch of raw materials complies with the Technical Standard for Glass Fiber Reinforced Cement (GRC) for Building Applications (JGJ/T423-2018). During production, an automated batching system precisely controls the water-cement ratio, and a "dry-mix" process is adopted to reduce the formation of free chloride ions. In addition, Qinglong has established a comprehensive quality traceability system, conducting sampling tests for chloride ion content on each batch of GRC products, with data uploaded in real time to the enterprise management platform, enabling full-process monitoring.

Beyond the production stage, construction and later maintenance are also crucial. When installing GRC components, Qinglong uses galvanized or stainless steel connectors to avoid electrochemical corrosion caused by metal contact; meanwhile, installation joints are sealed to prevent external chloride ions from penetrating through gaps. For after-sales maintenance, Qinglong provides regular inspection services, using professional equipment to assess changes in the chloride ion content of components and offering targeted maintenance plans based on the test results. Thanks to these measures, projects undertaken by Qinglong, such as the Nanjing East Road Century Plaza renovation project and the Dongguan Women and Children's Activity Center, have all achieved excellent performance, with GRC components remaining free of rust and cracking for over 15 years.

As a national high-tech enterprise and a participant in the formulation of GRC industry standards, Qinglong Group always puts material safety first. From detailed design to after-sales maintenance, Qinglong provides customers with GRC solutions featuring precise chloride ion control through its full-chain service capabilities. Whether for large domestic real estate projects or overseas projects in Southeast Asia, choosing Qinglong GRC means choosing high-quality architectural decoration materials that combine aesthetic appeal with structural safety. For more industry information: +WeChat qlfsbl123