What Are the Raw Materials of GRC: Types and Properties of Common Raw Materials Explained

Material is the language of architecture. GRC, through the perfect fusion of glass fiber and cement, injects a soul of lightness and artistry into modern buildings. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group will analyze the core advantages of GRC from a raw materials perspective, providing professional selection guidance for designers and owners.

Amid the wave of innovation in architectural decoration materials, GRC (Glass Fiber Reinforced Concrete) has become the preferred material for premium venues such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength and freely formable characteristics. Behind its outstanding performance lies a scientifically proportioned raw material system. As a national-level high-tech enterprise integrating detailed design, manufacturing, and construction and installation, Qinglong Group will systematically analyze the types, properties, and selection logic of commonly used GRC raw materials.

GRC Raw Material System: The Synergy of Four Core Components

GRC is not a single material, but a composite system composed of cementitious materials, reinforcing materials, aggregates, and admixtures. Among these, the “golden partnership” of glass fiber and cement is the key to its performance breakthrough. Qinglong Group has established a standardized raw material testing laboratory at its production base in Nanning, Guangxi, where every batch of materials is tested against 26 indicators including flexural strength and alkali resistance, ensuring product quality is controlled at the source.

Cementitious Materials: The Foundation of GRC Strength

Portland cement is the most commonly used cementitious material in GRC; the dense structure formed by its hydration reaction provides basic strength for components. Qinglong uses Grade 42.5R ordinary Portland cement, combined with specific mineral admixtures (such as fly ash and slag powder) to optimize slurry fluidity and later-stage strength. Compared with traditional cement products, the scientific proportioning of cementitious materials in GRC can raise flexural strength to 15-20MPa, meeting the load-bearing requirements of large-span components.

Reinforcing Materials: The “Skeleton” Role of Glass Fiber

Alkali-resistant glass fiber is the core reinforcing component of GRC; accounting for just 3-5% of the component volume, it can improve crack resistance by 300%. Qinglong selects alkali-resistant glass fiber with a zirconium content of ≥16%, which, after treatment with special sizing agents, achieves a perfect bond with the cement matrix. Compared with ordinary glass fiber, alkali-resistant fiber retains over 85% of its strength in alkaline environments, ensuring the long-term stability of GRC components in complex conditions such as humidity and temperature variations.

Aggregates and Admixtures: Key Variables in Performance Optimization

Quartz sand, as the fine aggregate, must have a particle size controlled within 0.15-0.6mm to ensure matrix densification, while admixtures such as methyl cellulose ether and water-reducing agents serve respectively to retain water and thicken the mix, and to lower the water-cement ratio. Through orthogonal testing, Qinglong determines the optimal mix proportion, keeping the dry density of GRC within 1800-2000kg/m³—only 1/4 that of traditional stone—greatly reducing building loads.

From the hyperbolic exterior wall cladding panels of a landmark project in Guangzhou to the special-shaped sunshade components at a Malaysian airport, Qinglong GRC, with its high-quality raw materials and full-chain technical advantages, has successfully served more than a thousand major projects at home and abroad. Choosing GRC is not merely choosing a material, but choosing a systematic solution that integrates design detailing, precision manufacturing, and safe installation. As Vice Chairman Unit of the China GRC Association, Qinglong will continue its mission of “Creating Beautiful Architecture,” providing the industry with more innovative GRC application solutions.