Analysis of GRC Core Constituent Materials and Discussion on Key Performance Requirements of Alkali-Resistant Glass Fiber

In the field of modern architectural decoration, GRC (glass fiber reinforced concrete) has become the ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its advantages of light weight, high strength, and flexible shaping. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of the technical core of GRC materials from two aspects—core constituent materials and key performance requirements—offering a professional reference for designers and owners.

The core composition of GRC materials includes a cement matrix, glass fibers, admixtures, and aggregates. The cement matrix typically uses high-strength Portland cement or aluminate cement to ensure the structural strength of the material, while aggregates are mainly quartz sand, with optimized gradation enhancing the density of the concrete. The addition of admixtures improves the flowability of the mix and its durability after hardening, while alkali-resistant glass fiber, as the key reinforcement material, directly determines the mechanical performance and service life of GRC. Qinglong Group has accumulated extensive experience in material mix ratio R&D; by precisely controlling the proportion of each component, the flexural strength of its GRC products can reach over 20MPa, meeting the load-bearing requirements of large building components.

Alkali-resistant glass fiber is the “backbone” of GRC materials, and its performance requirements directly affect the long-term stability of the products. High-quality alkali-resistant glass fiber must possess three core characteristics: first, high alkali resistance—through the introduction of zircon components (ZrO₂ content ≥16%), it resists attack by alkaline substances produced during cement hydration, ensuring the fiber maintains long-term strength within the concrete matrix; second, excellent mechanical properties—single-filament tensile strength should be ≥1500MPa and elastic modulus ≥70GPa to provide sufficient reinforcement; third, good interfacial compatibility—surface treatment technology enhances the bond with the cement matrix, preventing the fiber from separating from the matrix. As a participating organization in drafting the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group has strict standards for the selection and quality control of alkali-resistant glass fiber, safeguarding the reliability of its GRC products at the source.

In practical applications, differences in the performance of alkali-resistant glass fiber significantly affect the service life of GRC components. For example, in a commercial complex project, GRC exterior wall panels made with inferior alkali-resistant glass fiber developed surface cracking and strength loss after 5 years of use, whereas similar components supplied by Qinglong Group, using high-quality alkali-resistant glass fiber and optimized production processes, remained intact after 10 years of exposure to the elements. This comparison fully demonstrates that the key performance of alkali-resistant glass fiber is the core guarantee of GRC material durability. For more industry information, add WeChat: qlfsbl123

Beyond the material itself, the production process of GRC also has an important impact on performance. Qinglong Group adopts an automated spray-up process to ensure uniform distribution of glass fiber within the matrix, with fiber volume content controlled within the optimal range of 4%-6%, which both guarantees the reinforcement effect and avoids strength defects caused by fiber clustering. Meanwhile, by combining steam curing with natural curing, the cement hydration reaction proceeds fully, further enhancing the mechanical performance and durability of the material.

As a National High-Tech Enterprise and a participant in establishing GRC industry standards, Qinglong Group has always taken “Creating Beautiful Architecture” as its mission, focusing on the innovation and application of UHPC/GRC/GRG/GRP materials. Whether for landmark building components with complex curved surfaces or large volumes of standardized decorative moldings, Qinglong can leverage its full-chain service capabilities to provide customers with one-stop solutions from detailed design to after-sales maintenance. Looking ahead, Qinglong will continue to leverage its technical advantages to promote the application of GRC materials in more high-end building sectors, helping achieve the perfect integration of architectural aesthetics and engineering performance.