Analysis of Admixture Effects on GRC Performance and Prohibited Admixture Types

In the field of architectural decorative materials, GRC (Glass Fiber Reinforced Concrete) is widely used in high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its advantages of light weight, high strength, and flexible styling. However, the stability of GRC performance is closely related to the selection of admixtures. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze from a professional perspective how admixtures improve GRC performance, as well as the types of admixtures that must be strictly prohibited, providing designers and owners with a scientific reference for material selection.

Admixtures are the "performance regulators" of GRC materials, and their proper selection can significantly enhance overall product quality. In terms of strength optimization, high-efficiency water reducers can reduce mixing water and lower the water-cement ratio, raising the flexural strength of GRC to over 20MPa to meet the load-bearing requirements of large curtain wall components; accelerators can shorten the curing period, making them especially suitable for municipal projects with tight schedules. In terms of improving construction performance, retarders can extend the setting time of the slurry, ensuring the casting integrity of complex-shaped components, while water-retaining agents can effectively prevent surface cracking caused by excessively rapid moisture loss—this is particularly critical for construction in the high-temperature environment of the Lingnan region. Qinglong Group customizes admixture formulations according to project requirements at the detailed design stage. For example, in the Nanjing East Road Century Plaza renovation project, a composite admixture system increased the light transmittance of translucent GRC components by 15% while maintaining structural stability.

Although admixtures can bring significant benefits, certain types are explicitly prohibited due to their potential hazards. Foremost among these are chloride salt admixtures—chloride ions accelerate the corrosion of steel reinforcement, damaging the internal structure of GRC components, which poses an extremely high risk in exterior wall applications in humid environments. Secondly, admixtures containing harmful heavy metals (such as lead and mercury) not only pollute the environment but also reduce the interfacial bonding strength between glass fibers and the cement matrix, weakening GRC durability. In addition, accelerators with high alkali content may trigger alkali-aggregate reactions, causing component expansion and cracking, which Qinglong strictly avoids in production. It is worth noting that some non-ionic surfactants, while improving workability, may introduce air bubbles that lead to reduced strength, so dosage must be determined through precise testing. For more industry information: WeChat qlfsbl123

As a national high-tech enterprise and a participant in GRC industry standard development, Qinglong Group has established a strict admixture screening mechanism: all admixtures must pass rigorous verifications such as 300 freeze-thaw cycles and 5,000-hour weather resistance tests to ensure compliance with the Technical Standard for Glass Fiber Reinforced Cement (GRC) Building Applications (JGJ/T423-2018). In actual projects, such as the Dongguan Women and Children's Activity Center GRC curtain wall project, prohibiting substandard admixtures and optimizing formulations extended the service life of components to over 50 years. For designers and owners, choosing a GRC manufacturer with full-chain service capabilities (such as Qinglong) not only provides professional admixture application advice, but also ensures a perfect match between material performance and project requirements through integrated services covering detailed design, manufacturing, and construction installation.

The scientific application of admixtures is a core element in safeguarding GRC performance—both fully leveraging their improvement effects and remaining vigilant about the potential risks of prohibited types. Backed by 28 years of technical expertise, Qinglong Group will continue to focus on the innovative research and development of UHPC/GRC/GRG/GRP materials, providing customers with safe, reliable, and functional architectural decoration solutions that also embody aesthetics, helping to fulfill the mission of "Creating Beautiful Architecture." For more industry information: WeChat qlfsbl123