How UHPC Manufacturers Handle Product Quality Issues: Process, Measures and Industry Best Practices Explained

The durability of building materials directly affects the safety and lifespan of a building. GRC (glass fiber reinforced concrete), a decorative material widely used in modern architecture, has 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. From two aspects—testing methods and key indicators—this article explains how designers, owners, and industry peers can scientifically verify the carbonation resistance of GRC products, helping them choose a reliable GRC manufacturer.

GRC Carbonation Resistance: The Invisible Guardian of Building Durability

Carbonation is a natural process in which concrete, under the action of carbon dioxide in the air, undergoes reduced alkalinity and decreased strength. GRC, through the combination of glass fibers and a cement matrix, theoretically possesses stronger carbonation resistance. However, the quality of GRC products on the market varies considerably; some manufacturers reduce fiber content or simplify curing processes to cut costs, significantly compromising carbonation resistance. As a national high-tech enterprise, Qinglong participated in formulating the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), and understands that carbonation resistance must be verified through rigorous testing and scientific indicators, not merely manufacturers' claims.

Authoritative Testing Methods: Dual Verification from Laboratory to Engineering Practice

Verifying GRC carbonation resistance requires starting from two aspects: 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), the product's 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 factory quality.

Engineering cases serve as the "field 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 endured more than 5 years of natural environmental exposure, and periodic testing has shown 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 density—combined with strict implementation of a 7-day standard curing process, improving carbonation resistance at the source.

Key Indicators Explained: Three Core Parameters That Determine Product Quality

To judge GRC carbonation resistance, the following indicators deserve close attention: First, the alkalinity of the cement matrix—a high-alkalinity environment with a pH ≥12.5 can form a passivation film that protects reinforcing steel. Qinglong uses high-grade Portland cement to ensure stable matrix alkalinity. Second, density: through porosity testing (mercury intrusion porosimetry is recommended), high-quality GRC should have a porosity of ≤15%. With vacuum forming technology, Qinglong achieves material density 30% higher than traditional casting. Third, the alkali resistance of the glass fibers: alkali-resistant glass fibers (AR glass fibers) should be selected, with an alkali resistance retention rate of ≥85%, to prevent premature fiber degradation from diminishing 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 incoming raw materials (e.g., cement must be accompanied by an alkali content test report), to the production process (e.g., real-time monitoring of fiber dispersion), to finished products leaving the factory (spot checks of carbonation depth)—with every step traceable, ensuring that products meet carbonation resistance standards.

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

For designers and owners, verifying GRC carbonation resistance requires not only reviewing test reports but also examining the manufacturer's strength. Qinglong recommends focusing on three points: First, whether the manufacturer participates in industry standard formulation—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, ensuring process stability. Third, after-sales maintenance capability: Qinglong provides warranty service 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 architectural 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. Going forward, Qinglong will continue to deepen its expertise in the UHPC/GRC/GRG/GRP materials field, driving high-quality industry development through professional innovation.