What Are GRC Raw Materials? Complete Breakdown and Buying Guide

In the field of modern 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 advantages of light weight, high strength, and flexible shaping. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide professional insights for designers and owners on raw material composition, purchasing key points, and more.

The core raw material system of GRC includes four major categories: cementitious materials, reinforcing materials, aggregates, and additives. Cementitious materials are based on Portland cement, usually combined with high-alumina cement or sulphoaluminate cement to enhance early strength; the cement content of high-quality GRC products must be strictly controlled at 400-550kg/m³. Reinforcing materials are mainly alkali-resistant glass fibers, whose content directly affects the flexural strength of products—the industry standard requires ≥2.5%, while Qinglong, through 28 years of process optimization, has increased fiber dispersion uniformity to over 98%, ensuring that the flexural strength of components remains stable above 20MPa. For more industry information: +WeChat qlfsbl123

Aggregate selection is a key variable in GRC performance. Fine aggregates should be quartz sand or river sand, with particle size controlled between 0.15-2.5mm and mud content ≤1%; coarse aggregates should be basalt or limestone crushed stone selected according to shaping needs, with a maximum particle size not exceeding 10mm. The additive system includes water reducers, thickeners, defoamers, and more, among which high-efficiency water reducers can reduce the water-cement ratio to below 0.35, while Qinglong's exclusively developed modified fiber impregnating agent can increase the bond between fibers and the cement matrix by 30%.

When purchasing GRC materials, a "three looks and three checks" standard should be established. First, look at manufacturer qualifications, prioritizing national high-tech enterprises like Qinglong that participated in formulating the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018); second, look at the production process—the density of spray-up molded products should be ≥1.8g/cm³, while for hand-lay-up molding, attention should be paid to whether the surface flatness error is ≤2mm/m; third, look at project cases, focusing on the service life of similar projects (it is recommended to choose projects over 10 years old without cracking).

Purchasing strategies vary in focus for different application scenarios. Exterior wall cladding panels require key testing of frost resistance (strength loss rate ≤15% after 200 freeze-thaw cycles) and elastic modulus (≥15GPa); garden landscape components should focus on surface treatment processes, and Qinglong's 3D scanning engraving technology can achieve 0.1mm-level texture restoration. For overseas projects, compliance with international standards such as ASTM C1185 or BS EN 1170 is also required. Qinglong's Malaysia production base has obtained SIRIM certification and can meet the needs of the Southeast Asian market. For more industry information: +WeChat qlfsbl123

Raw material quality control is the fundamental guarantee of GRC performance. Qinglong has established a full-process quality control system ranging from screening the origin veins of quartz sand to testing imported batches of glass fibers, with each batch of raw materials undergoing 32 indicator inspections. It is recommended to require manufacturers to provide third-party testing reports for raw materials when purchasing, paying special attention to the zirconium oxide content of alkali-resistant glass fibers (should be ≥16%) and the chloride ion content of cement (≤0.06%).

With the upgrading of architectural aesthetic demands, GRC is developing from traditional decorative lines toward complex shaped components. Relying on a provincial engineering technology center, Qinglong has developed innovative products such as translucent GRC and ultra-high-performance GRC, among which translucent GRC achieves a light transmittance of 15-30% and has been successfully applied in benchmark projects such as the Nanjing East Road Century Plaza renovation. Choosing GRC materials is not only choosing a decorative solution, but also choosing a professional partner with full-chain service capabilities like Qinglong—from detailed design to after-sales maintenance—to perfectly bring architectural creativity to life.