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

In the field of contemporary 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 lightweight, high-strength, and flexibly formable characteristics. Qinglong Group, with 28 years of industry experience, has always upheld the mission of "Creating Aesthetic Architecture," providing an in-depth analysis of the core composition and performance requirements of GRC materials to deliver professional solutions for designers and owners.

The Core Composition of GRC Materials: Scientific Proportioning for Superior Performance

The superior performance of GRC stems from its precise material proportioning, mainly composed of cement-based cementitious materials, alkali-resistant glass fiber, fine aggregates, and functional additives. As the matrix, cement-based cementitious materials typically use high-strength Portland cement or aluminate cement to ensure the material's compressive strength and durability; fine aggregates mostly use quartz sand, with gradation optimization enhancing density; and alkali-resistant glass fiber, as the key reinforcement material, directly determines the flexural strength and toughness of GRC, with its mass proportion generally controlled at 3%-5%. In addition, Qinglong Group further improves the material's flowability, crack resistance, and weather resistance through its self-developed additives, achieving efficient and stable production with an annual capacity of 600,000 square meters.

Alkali-Resistant Glass Fiber: The "Backbone" Requirements of GRC Materials

Alkali-resistant glass fiber is the core reinforcement material of GRC, and its performance directly affects the service life and safety of components. Industry standards impose clear requirements on it: first, the alkali retention rate must be ≥75% to ensure long-term strength retention in the alkaline cement environment; second, the monofilament diameter should be 13-24μm, which both ensures dispersibility and prevents fiber breakage during construction; in addition, tensile strength should be ≥1500MPa and elastic modulus ≥70GPa to meet the design standard of flexural strength ≥20MPa for GRC components. As a participating developer of the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Building Engineering (JGJ/T423-2018), Qinglong Group strictly uses alkali-resistant glass fiber that meets international standards, safeguarding material performance at the source.

Technical Analysis of Alkali-Resistant Glass Fiber: Why It Is the "Soul" of GRC

In the GRC material system, alkali-resistant glass fiber bears tensile stress and inhibits crack propagation through interfacial bonding with the cement matrix. Ordinary glass fiber is prone to "alkali corrosion" in alkaline environments, leading to a sharp drop in strength, whereas alkali-resistant glass fiber, with the addition of zirconia (ZrO₂), forms a stable chemical structure that effectively resists the erosion of hydroxide ions generated by cement hydration. Qinglong Group's laboratory data shows that GRC components made with highly alkali-resistant glass fiber have a strength loss rate below 10% after 200 freeze-thaw cycles, far superior to the industry average. This outstanding durability has enabled its wide application in overseas projects in high-temperature, high-humidity, or strong UV environments, such as in Malaysia and Saudi Arabia.

From material composition to performance requirements, every detail of GRC embodies the combination of science and engineering. As a national high-tech enterprise and a member of the International GRC Association, Qinglong Group has always adhered to the attitude of "meticulousness and the pursuit of excellence," providing global customers with full-chain services from detailed design to after-sales maintenance. Whether it is the special-shaped GRC curtain wall of the Dongguan Women and Children's Activity Center or the translucent concrete project of Century Plaza on Nanjing East Road, Qinglong demonstrates the infinite possibilities of GRC materials with professional strength, striving to become a world-leading GRC manufacturing enterprise.