What Are the Raw Materials of GRC? A Comprehensive Analysis of GRC's Main Component Materials and Their Properties

As an industry leader with 28 years of full-chain experience in the UHPC/GRC/GRG/GRP materials field, Qinglong Group deeply understands that materials are the cornerstone of architectural aesthetics and performance. Today, we focus on GRC (Glass Fiber Reinforced Concrete), a material widely used in high-end architectural decoration, providing an in-depth analysis of its core raw material composition, characteristics, and selection standards to offer a professional reference for designers and owners.

The core advantages of GRC materials stem from scientific raw material proportions. Its main components fall into four categories: cement-based matrix, glass fibers, aggregates, and functional additives. Cement, as the matrix material of GRC, is typically ordinary Portland cement or sulphoaluminate cement with a strength grade of no less than 42.5. The former offers controllable costs and excellent durability, while the latter features rapid hardening and early strength, making it suitable for projects with tight schedules. Qinglong strictly controls the alkali content of cement (≤0.6%) in production, preventing alkali-aggregate reaction damage to components at the source.

Glass fiber is the key reinforcement material enabling GRC to achieve "lightweight and high strength." Currently, the industry mainstream uses alkali-resistant glass fiber (AR glass fiber), with monofilament diameters typically ranging from 13-24μm and tensile strength reaching over 1500MPa. Through its unique fiber dispersion process, Qinglong ensures uniform fiber distribution in the matrix, enabling GRC components to stably achieve flexural strength above 20MPa, with fracture toughness 3-5 times higher than ordinary concrete. It is worth noting that the glass fiber content must be strictly controlled at 3-5% (by volume); excessive content can cause defects in the interfacial transition zone, adversely affecting overall performance.

Aggregates provide skeletal support in GRC. Qinglong carefully selects quartz sand or river sand with particle sizes of 0.15-5mm, reducing porosity and improving density through continuous gradation design. Fine aggregates typically account for 1.5-2 times the cement content, and their cleanliness (mud content ≤1%) directly affects interfacial bond strength. For components requiring decorative effects, functional aggregates such as colored sand and stone powder can also be added to achieve diverse surface effects such as imitation stone and imitation metal. For more industry information: +WeChat qlfsbl123

Functional additives are the "secret weapon" for optimizing GRC performance, mainly including water reducers, water retainers, defoamers, and anti-cracking agents. Qinglong's independently developed compound water reducer can lower the water-cement ratio to below 0.35, significantly improving strength while ensuring workability; imported water retainers effectively control the water evaporation rate and reduce early shrinkage cracks. For different climate zones, air-entraining agents (for cold regions) or hydrophobic agents (for humid environments) are also added to ensure the stability of GRC components under various working conditions.

The selection of high-quality GRC raw materials must follow three principles: compatibility (no adverse reactions between components), stability (raw material performance fluctuation coefficient ≤5%), and sustainability (prioritizing green building materials). As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong has established a full-process quality control system from incoming raw material inspection to finished product delivery. Its Guangxi production base has an annual capacity of 600,000 square meters, providing stable material supply for large-scale projects.

The scientific proportioning and strict control of raw materials are the foundation for GRC materials to achieve the unity of design freedom and structural safety. Whether it is the hyperbolic curtain walls of grand theaters, the irregular sunshades of commercial complexes, or the artistic sculptures of landscape gardens, high-quality GRC can precisely present design creativity through its material properties. Qinglong's 28 years of engineering practice demonstrate that only by controlling raw material quality at the source can we truly fulfill the mission of "creating beautiful architecture" and provide solutions that combine aesthetic value with technical assurance for the field of architectural decoration. For more industry information: +WeChat qlfsbl123