What Are the Raw Materials of GRC? Types and Characteristics of GRC Raw Materials Explained

The texture and safety of a building often begin with the choice of materials. As a dedicated player in the field of glass fiber reinforced concrete (GRC), Qinglong Group's 28 years of industry experience tell us this: the birth of quality GRC is inseparable from the utmost control over raw materials. Today, we take an in-depth look at the core raw materials of GRC and how they together shape this new building material that combines strength with aesthetics.

GRC Raw Material System: Scientific Proportioning of Four Core Components

GRC is not a simple blend of materials, but a composite material system composed of glass fiber, cement-based cementitious materials, aggregates, and functional additives. In production, Qinglong strictly follows the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), ensuring that every raw material is precisely screened and proportioned. Among them, glass fiber serves as the reinforcing skeleton and determines the flexural strength of GRC (quality products can reach over 20MPa); cement-based materials provide basic strength and durability; the addition of lightweight aggregates effectively reduces self-weight (only 1/4 of traditional stone); and additives optimize product performance for different environmental needs, such as frost resistance and impermeability.

Glass Fiber: The Backbone and Performance Core of GRC

Among GRC raw materials, glass fiber plays the role of "rebar". Qinglong uses alkali-resistant glass fiber, which, at a diameter of only 5-24 microns, can withstand enormous tensile stress. The interfacial bond strength between this fiber and the cement matrix is more than 3 times that of ordinary glass fiber, ensuring the material's stability under long-term loads. Notably, inferior GRC often substitutes medium-alkali or alkali-free glass fiber; while this lowers costs, it leads to cracking and powdering within 3-5 years. As a Vice Chairman Unit of the China GRC Association, Qinglong has always insisted on using alkali-resistant glass fiber that complies with the JC/T841 standard—this is also the quality confidence behind its undertaking of landmark projects such as the Dongguan Women and Children's Activity Center.

Cement-Based Materials and Aggregates: The Key to Balancing Strength and Lightweight Design

The matrix materials of GRC typically consist of Portland cement, quartz sand, and mineral admixtures. Through 28 years of process accumulation, Qinglong has developed a proprietary cement-based formula that significantly reduces shrinkage cracking caused by hydration heat while ensuring compressive strength. As for aggregates, the selected quartz sand must undergo gradation optimization, with particle size controlled between 0.15-2.5mm, which both ensures concrete density and creates conditions for the even distribution of glass fiber. This scientific proportioning enables Qinglong GRC products to meet both the wind pressure resistance requirements of grand theater exterior walls and the fine texture required for special-shaped components in museums.

Functional Additives: Technical Support for Customized Needs

For different application scenarios, additives are the "fine-tuners" of GRC performance. In high-humidity environments (such as underground utility corridors), Qinglong adds high-efficiency water reducers and waterproofing agents, bringing the product's impermeability grade to P8 or above; in projects in cold regions, air-entraining agents are introduced to enhance freeze-thaw cycle resistance (over 300 cycles). It is worth mentioning that the composite additive system independently developed by Qinglong's R&D center can increase the early strength of GRC by 40% and effectively shorten the production cycle—this is also the technical guarantee that enables it to provide rapid delivery services to real estate groups such as Vanke and China Overseas.

From raw material screening to production process control, the quality code of GRC lies hidden in every detail. As a national Specialized, Refined, Differentiated, and Innovative (SRDI) enterprise, Qinglong always maintains an attitude of "meticulousness and the pursuit of excellence", deeply integrating materials science with engineering practice. Whether it is the curved curtain walls of commercial complexes or the artistic components of landscape gardens, the proper combination of quality GRC raw materials is the foundation for achieving the unity of architectural aesthetics and structural safety. Choosing Qinglong GRC means choosing a material solution verified by 28 years of engineering.