GRC Core Composition Materials and Alkali-Resistant Glass Fiber Requirements Explained

In the field of modern architectural decoration, GRC (glass fiber reinforced concrete), with its lightweight yet high-strength properties and rich sculptural versatility, has become an ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings. As a core component of GRC materials, the quality of glass fiber directly determines the performance of the components, and alkali-resistant glass fiber is the key element among them. As a national high-tech enterprise with 28 years of industry experience, Qinglong Group has consistently integrated materials science with engineering practice in the R&D and application of GRC materials, providing designers and owners with a full-chain solution from detailed design to after-sales maintenance.

The Core Composition of GRC Materials: Scientific Proportioning of Cement-Based Matrix and Reinforcing Materials

The performance advantages of GRC materials stem from their unique composite structure, which consists of four main components: the cement-based matrix, reinforcing materials, admixtures, and water. The cement-based matrix typically uses rapid-hardening sulphoaluminate cement or ordinary Portland cement to ensure the strength and durability of the material; the reinforcing material is primarily alkali-resistant glass fiber, which forms a three-dimensional network structure through uniform dispersion, enhancing the flexural strength and toughness of the components; admixtures include water reducers, retarders, waterproofing agents, and more, used to optimize workability and finished product quality. This scientific proportioning gives GRC components both the stability of concrete and the ductility of glass fiber—weighing only 1/4 of traditional stone, yet capable of achieving complex curved forms and fine textures.

Alkali-Resistant Glass Fiber: The "Skeleton" and Performance Guarantee of GRC Materials

As the reinforcing skeleton of GRC, the alkali resistance of glass fiber directly affects the long-term service life of the components. Ordinary glass fiber is prone to corrosion in alkaline cement environments, leading to a decline in material strength, while alkali-resistant glass fiber, through compositional optimization (such as the addition of zirconia), can effectively resist the erosion of the highly alkaline environment produced by cement hydration. Qinglong Group strictly selects alkali-resistant glass fiber in production, requiring the filament diameter to be controlled within 13-20 μm and the alkali retention rate to be ≥75%, ensuring structural stability over long-term use. Meanwhile, the length and dosage of the fiber must be precisely adjusted according to the load-bearing requirements of the components, typically 15-30 mm in length with a volume dosage of 3%-5%, to achieve the best reinforcement effect.

Industry Standards and Qinglong Practice: Full-Process Control from Material Selection to Project Delivery

As a participating unit in drafting the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group implements the standard requirements throughout the entire process of material production and project execution. During the material selection stage, strict performance testing is conducted on alkali-resistant glass fiber, covering key indicators such as tensile strength, elastic modulus, and alkali resistance; in the production process, automated spray-up molding technology is adopted to ensure uniform fiber distribution within the matrix, avoiding agglomeration or breakage; in project applications, BIM technology combined with 3D scanning positioning enables precise installation of complex components. For example, in the Dongguan Women and Children's Activity Center project, Qinglong optimized the configuration of alkali-resistant glass fiber, enabling the GRC exterior wall panels to meet the sculptural requirements while achieving high standards of flexural strength ≥20 MPa and impact resistance ≥10 kJ/m², winning the Silver Award at the first GRC Building Engineering Innovation Awards.

For architectural designers and project owners, selecting high-quality GRC materials requires not only attention to appearance but also a deep understanding of their core composition and performance parameters. Backed by 28 years of full-chain experience, Qinglong Group transforms the performance advantages of alkali-resistant glass fiber into building safety and aesthetics through scientific material proportioning, strict quality control, and innovative technical solutions. Whether it is the exquisite reproduction of European classical lines or the irregular curved surfaces of modern architecture, Qinglong GRC always maintains a "meticulous and excellence-driven" attitude, creating decorative solutions that combine artistic value and engineering quality for every project, helping to realize the corporate mission of "creating beautiful architecture."