How to Verify a Manufacturer's GRC Product Carbonation Resistance: Testing Methods and Key Indicators Explained

The durability of building materials directly affects the safety and lifespan of buildings. As a decorative material widely used in modern construction, GRC (Glass Fiber Reinforced Concrete) regards carbonation resistance as a core indicator for measuring product quality. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the importance of carbonation resistance to long-term building stability. This article explains, from two aspects—testing methods and key indicators—how designers, owners, and industry colleagues can scientifically verify the carbonation resistance of GRC products, helping you choose a reliable GRC manufacturer.

GRC Carbonation Resistance: The Invisible Guardian of Building Durability

Carbonation is the natural process by which concrete loses alkalinity and strength under the action of carbon dioxide in the air, while GRC, through the composite of glass fibers and cement matrix, theoretically possesses stronger carbonation resistance. However, the quality of GRC products on the market varies greatly; some manufacturers reduce fiber content or simplify curing processes to cut costs, greatly compromising carbonation resistance. As a national high-tech enterprise, Qinglong participated in drafting the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), and knows well that carbonation resistance must be verified through rigorous testing and scientific indicators rather than merely by manufacturer claims.

Authoritative Testing Methods: Dual Verification from Laboratory to Engineering Practice

Verifying the carbonation resistance of GRC requires starting from both laboratory testing and engineering cases. At the laboratory level, in accordance with the national standard Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete (GB/T 50082), product carbonation resistance is evaluated through carbonation depth testing: GRC specimens are placed in an environment with a carbon dioxide concentration of 20±3%, a relative humidity of 70±5%, and a temperature of 20±2°C, and the carbonation depth is measured periodically; high-quality GRC should show a carbonation depth of ≤5mm at 28 days. Qinglong's production base is equipped with advanced carbonation test chambers, and every batch of products must pass this test to ensure consistent ex-factory quality.

Engineering cases serve as the "real-world test" of carbonation resistance. In projects such as the Dongguan Women and Children's Activity Center and Nanjing East Road Century Plaza, Qinglong's GRC components have withstood more than 5 years of natural environmental exposure, with periodic testing revealing carbonation depths far below the industry average. This is attributed to Qinglong's "dual admixture technology"—incorporating mineral powder and silica fume to optimize matrix compactness—along with strict implementation of the 7-day standard curing process, enhancing carbonation resistance at the source.

Key Indicators Explained: Three Core Parameters That Lock In Product Quality

To assess the carbonation resistance of GRC, focus on the following indicators: first, the alkalinity of the cement matrix—a high-alkalinity environment with pH ≥12.5 forms a passivation film that protects steel reinforcement, and Qinglong uses high-grade Portland cement to ensure stable matrix alkalinity; second, compactness—through porosity testing (mercury intrusion method recommended), high-quality GRC should have a porosity of ≤15%, and Qinglong's vacuum forming process increases material compactness by 30% compared to traditional casting; third, the alkali resistance of glass fibers—alkali-resistant glass fibers (AR glass fibers) with an alkali retention rate of ≥85% should be selected to prevent premature fiber degradation that would reduce carbonation resistance.

In addition, the manufacturer's production control system is equally critical. As a "specialized, refined, distinctive, and innovative" enterprise, Qinglong has established a full-process quality traceability system—from raw material intake (e.g., cement must be accompanied by alkali content test reports) to production (e.g., real-time monitoring of fiber dispersion) to finished product shipment (random sampling for carbonation depth)—with every stage traceable to ensure products meet carbonation resistance standards.

Choosing a Reliable GRC Manufacturer: A Comprehensive Evaluation from Indicators to Capabilities

For designers and owners, verifying the carbonation resistance of GRC requires not only reviewing test reports but also assessing the manufacturer's capabilities. Qinglong recommends focusing on three points: first, whether the manufacturer participates in industry standard-setting—Qinglong has participated in compiling multiple GRC/UHPC standards and has a more professional understanding of performance indicators; second, production scale and equipment—Qinglong's modern base with an annual capacity of 600,000 square meters is equipped with fully automated production lines to ensure process stability; third, after-sales maintenance capabilities—Qinglong provides warranty services of up to 10 years and conducts regular carbonation depth testing on projects, giving customers complete peace of mind.

Carbonation resistance is the "lifeline" of GRC products. Only by choosing a manufacturer with testing capabilities, technical strength, and engineering experience can the long-term safety and aesthetics of building decoration be ensured. Guided by its mission of "Creating Beautiful Architecture," Qinglong Group integrates core indicators such as carbonation resistance into full product lifecycle management, providing customers with one-stop solutions from detailed design to after-sales maintenance. Looking ahead, Qinglong will continue to deepen its expertise in the UHPC/GRC/GRG/GRP materials field, driving high-quality industry development through professional innovation.