The Improvement Effect of Admixtures on GRC Performance and Analysis of Prohibited Admixture Types

In the field of modern architectural decoration, the optimization of material performance and adherence to safety standards are like twin pillars of a building—neither can be dispensed with. As an industry leader with 28 years of dedicated expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has always taken “creating beautiful architecture” as its mission, fulfilling its professional commitment in material technology innovation and industry standard-setting. Starting from the technical logic of enhancing GRC material performance, this article systematically analyzes the optimizing role of admixtures and the types that must be prohibited, providing designers and project owners with a material application guide that combines safety and economy.

The Core Engine of GRC Performance Optimization: Scientific Use of Admixtures

Glass Fiber Reinforced Concrete (GRC), with its advantages of light weight, high strength, and flexible shaping, has become the preferred decorative material for high-end buildings such as grand theaters and commercial complexes. With the synergistic effect of admixtures, the physical and mechanical properties and construction adaptability of GRC are significantly improved: water reducers lower the water-cement ratio, increasing the compressive strength of GRC components by 20%-30% while improving slurry fluidity to ensure precise forming of complex curved shapes; retarders extend the initial setting time to 4-6 hours, providing a sufficient operating window for the casting of large-span components; while air-entraining agents, by introducing uniform air bubbles, raise GRC's frost resistance by 3-5 freeze-thaw cycle grades, making it particularly suitable for outdoor projects in cold regions. In the Dongguan Women and Children's Activity Center project, Qinglong Group used a specially compounded admixture system to push the flexural strength of GRC exterior wall cladding panels beyond 22MPa and control surface flatness error within 2mm/m, successfully achieving the “perfect unity of architectural aesthetics and structural safety.”

Industry Safety Red Lines: Risk Analysis of Three Types of Prohibited Admixtures

Although admixtures are “performance enhancers” for GRC, improper use directly threatens building safety. According to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and verified by Qinglong Group's 28 years of engineering practice, the following three types of admixtures must be strictly prohibited: The first is early-strength agents with excessive chloride ion content, which cause steel corrosion and lead GRC components to crack and spall within 5-8 years; a coastal project suffered structural damage to its exterior decorative trim within just 3 years due to substandard early-strength agents. The second is quick-setting agents with alkali content exceeding 5%; excess alkali reacts chemically with glass fibers, reducing the material's flexural strength by more than 40%. The third is inferior water reducers containing volatile organic compounds, which not only cause concrete shrinkage cracks but also release harmful gases that pollute the indoor environment. As a company that has participated in formulating multiple national and industry standards, Qinglong has established a “triple testing” mechanism for raw materials, ensuring that every batch of admixtures passes chloride ion, alkali content, and VOCs index testing, eliminating safety hazards at the source.

Full-Chain Solutions: Qinglong's Practice from Material R&D to Project Delivery

As a National High-Tech Enterprise and a Specialized, Refined, Distinctive, and Innovative enterprise, Qinglong Group integrates admixture technology innovation into the full life-cycle management of GRC: In the detailed design stage, BIM technology is used to simulate the impact of different admixture ratios on component performance, and a custom admixture formula was developed for the translucent concrete project at Century Plaza on Nanjing East Road; in production, automated metering systems achieve precise admixture dosing, and the Guangxi production base with an annual capacity of 600,000 square meters is equipped with an industry-leading materials testing laboratory; during construction and installation, 3D laser scanning technology is combined to ensure that admixture-optimized GRC components achieve “zero-error” jointing. This integrated “design-production-construction” model has enabled Qinglong's GRC products to demonstrate outstanding durability and artistic expressiveness in real estate projects such as Poly and China Overseas, and to be exported to overseas markets such as Australia and Saudi Arabia.

Choosing GRC materials is not just choosing a decorative solution; it is choosing a long-term commitment to building safety and quality. With 28 years of professional experience, Qinglong Group reminds all designers and project owners: while pursuing aesthetic form and cost control, be sure to prioritize the scientific selection and compliant management of admixtures. Going forward, Qinglong will continue to uphold the values of “honesty, perseverance, trust, and collaboration,” driving industry progress through technological innovation and instilling more beauty and safety into the world's architecture.