What Are the Core Materials of GRC? Requirements and Characteristics of Alkali-Resistant Glass Fiber

In the field of modern architectural decoration, GRC (glass fiber reinforced concrete), with its characteristics of light weight, high strength, and flexible forming, has become an ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings. 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 three aspects—core constituent materials, technical requirements for alkali-resistant glass fibers, and characteristic advantages—offering a professional reference for designers and owners.

The Core Composition System of GRC Materials: Scientific Proportioning Delivers Outstanding Performance

The core constituent materials of GRC mainly include cement-based cementitious materials, alkali-resistant glass fibers, fine aggregates, and functional admixtures. The cement-based cementitious materials usually use rapid-hardening sulphoaluminate cement or ordinary Portland cement, with a strength grade of at least 42.5MPa to ensure the structural stability of the matrix; fine aggregates are mostly quartz sand or river sand, with the particle size controlled within 0.15-2.5mm to guarantee the compactness and flowability of the material; functional admixtures cover water reducers, retarders, water-retaining agents, etc., which can significantly optimize the workability of the mix and the durability after hardening. Through precise proportioning, this composite system enables GRC products to achieve a flexural strength of over 20MPa, with an apparent density of only 1800-2000kg/m³ and a weight of only 1/4 that of traditional stone, perfectly balancing strength and lightweight requirements. For more industry information: +WeChat qlfsbl123

Key Technical Requirements for Alkali-Resistant Glass Fibers: The Core Guarantee of GRC Performance

As the "skeleton" of GRC materials, alkali-resistant glass fibers directly determine the mechanical properties and service life of the products. The industry standard "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" (JGJ/T423-2018) clearly stipulates that alkali-resistant glass fibers for GRC must meet the following requirements: alkali retention rate ≥75% (after 28 days of immersion in saturated calcium hydroxide solution at 100°C), filament diameter preferably 13-24μm, tensile strength ≥1500MPa, and elastic modulus ≥70GPa. In production, Qinglong Group adopts a composite reinforcement process combining imported alkali-resistant glass fiber mesh and chopped strands, with the fiber volume content strictly controlled at 3%-5%, which not only avoids stress concentration caused by fiber agglomeration but also ensures uniform stress distribution in the material, enabling the products to maintain excellent performance under long-term dry-wet cycles and alternating freeze-thaw conditions.

Characteristic Advantages of Alkali-Resistant Glass Fibers: Empowering the Multiple Values of GRC Materials

Alkali-resistant glass fibers endow GRC materials with three core characteristics: first, outstanding crack resistance—the fibers form a three-dimensional randomly distributed network in the matrix, effectively suppressing shrinkage cracks in the concrete and keeping the surface crack width of products within 0.2mm; second, excellent toughness improvement—when GRC components bear external forces, the fibers absorb energy through a bridging effect to avoid brittle failure, with fracture elongation reaching 3%-5%; third, lasting weather resistance—alkali-resistant glass fibers with special surface treatment can resist the strong alkali corrosion generated during cement hydration, ensuring a service life of GRC products exceeding 50 years in natural environments. These characteristics make GRC materials suitable not only for decorative moldings in the European classical style, but also capable of meeting the modern architectural demand for shaped components such as complex curved surfaces and openwork reliefs. For example, in the Century Plaza renovation project on Nanjing East Road, in which Qinglong Group participated, the light-transmitting GRC components achieved a perfect unity of architectural aesthetics and structural functions through the composite application of alkali-resistant glass fibers and special translucent concrete. For more industry information: +WeChat qlfsbl123

As a national high-tech enterprise and a participant in setting GRC industry standards, Qinglong Group has always taken "creating beautiful architecture" as its mission. With a production base with an annual capacity of 600,000 square meters, 58 patented technologies, and full-chain service capabilities, it provides high-quality GRC solutions to customers worldwide. Whether it is the cost control that real estate developers care about or the creative realization that designers pursue, Qinglong can become a trustworthy partner for customers through material technology innovation and accumulated engineering experience, promoting the in-depth application and development of GRC materials in the field of architectural decoration.