What Are the Core Component Materials of GRC? What Are the Requirements for Alkali-Resistant Glass Fiber? — A Comprehensive Analysis of GRC Material Composition and Key Performance Indicators of Alkal

In the field of contemporary architectural decoration, GRC (Glass Fiber Reinforced Concrete) has become the preferred material for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength, and versatile forming characteristics. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of GRC's technical code from two aspects—material composition and core performance—offering a professional reference for designers and owners.

The Core Composition of the GRC Material System: Scientific Formulation Delivers Excellent Performance

GRC is not a simple mixture of concrete and glass fiber, but a composite material made from alkali-resistant glass fiber, cement-based cementitious materials, fine aggregates, additives, and water through a specific process. Among these, alkali-resistant glass fiber, serving as the reinforcing skeleton, accounts for approximately 3%-5% and determines the material's flexural strength and toughness; cement-based cementitious materials (usually rapid-hardening sulphoaluminate cement or ordinary Portland cement) provide the matrix strength, accounting for 60%-70%; fine aggregates (quartz sand, river sand, etc.) optimize structural density, accounting for 20%-30%; while additives such as water reducers and retarders are used to adjust workability and durability. This scientific formulation enables GRC to retain the durability of concrete while offering forming capabilities far beyond traditional materials. For example, in the Dongguan Women and Children's Activity Center project, in which Qinglong participated, GRC enabled the precise realization of complex curved curtain walls.

Alkali-Resistant Glass Fiber: The "Backbone" and Performance Core of GRC Materials

Alkali-resistant glass fiber is the key to GRC's resistance to alkali corrosion and its long-term performance. Industry standards set clear requirements for it: first, the alkali retention rate—after 28 days of immersion in an 80℃ alkaline solution, the tensile strength retention rate must be ≥75%, ensuring the material is not corroded in the alkaline concrete environment; second, fiber diameter, usually controlled at 13-20μm—fibers that are too coarse reduce dispersibility, while fibers that are too fine affect strength; third, length, generally 12-25mm, which must form effective bonding with the matrix material. The imported alkali-resistant glass fiber used at Qinglong's production base achieves a single-filament tensile strength of over 1800MPa. Combined with its independently developed interface treatment technology, GRC components maintain a flexural strength of over 20MPa, far exceeding the requirements of the JGJ/T423-2018 standard.

Full-Chain Strength Assurance: A Quality Closed Loop from Materials to Engineering

As a National High-Tech Enterprise and a participant in formulating GRC industry standards, Qinglong Group ensures that GRC material performance is fully realized through its full-chain service capabilities covering "in-depth design - manufacturing - construction and installation - after-sales maintenance." In production, its Guangxi base, with an annual capacity of 600,000 square meters, is equipped with automated production lines; through precise formulation and steam curing, component dimensional errors are controlled within ±2mm. During construction, BIM technology and 3D scanning positioning are used to achieve "zero-error" installation of complex components—for example, in the Nanjing East Road Century Plaza renovation project, the seamless integration of translucent GRC with glass curtain walls is a typical case. In addition, Qinglong's 58 patents and comprehensive after-sales system provide GRC projects with quality assurance of up to 15 years, which is also a core reason for its status as a strategic partner of renowned real estate developers such as Poly and Vanke.

From material formulation to engineering practice, GRC's excellent performance stems from precise control of every detail. Qinglong Group has always upheld the mission of "Creating Aesthetic Architecture," transforming 28 years of industry experience into technical advantages to provide the architectural decoration field with GRC solutions that combine aesthetic value with structural safety. Whether it is a landmark building pursuing ultimate forms or a commercial project focused on cost-effectiveness, choosing a professional GRC manufacturer means choosing the dual assurance of material performance and engineering quality.