Analysis of Main Factors Affecting GRC Strength Attenuation and Study of Countermeasures

The performance stability of building materials is the lifeline of engineering quality. As an important material in modern architectural decoration, GRC (Glass Fiber Reinforced Concrete) faces strength degradation issues that directly affect building safety and durability. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on more than 1,000 engineering projects to analyze in depth the core factors affecting GRC strength degradation and to propose systematic response strategies, providing professional solutions for designers and owners.

1. Analysis of Key Factors Affecting GRC Strength Degradation

The strength degradation of GRC materials results from the combined effects of material composition, production processes, and service environment. At the raw material level, the type and content of glass fibers are the core variables—high-alkali glass fibers are prone to corrosion in alkaline cement matrices, leading to reduced interfacial bond strength, while high-quality alkali-resistant glass fibers (e.g., with zirconia content ≥16%) can significantly improve durability. The mix proportion design of the cement matrix is equally critical: optimized combinations of admixtures such as silica fume and mineral powder can reduce hydration heat stress and minimize microcrack formation. During production, uneven fiber dispersion or insufficient molding pressure in spray-up forming can cause poor local fiber overlapping, while non-standard curing regimes (e.g., insufficient early-stage humidity) lead to inadequate cement hydration, directly affecting structural compactness. In addition, external factors in the service environment, such as ultraviolet radiation, freeze-thaw cycles, and chemical corrosion (e.g., industrial exhaust gases and acid rain), accelerate material deterioration, particularly in coastal high-humidity or cold regions.

2. Full-Chain Control: Qinglong's GRC Strength Assurance System

To address the above factors, Qinglong Group has established a full-process strength control system spanning from R&D to after-sales service. At the material R&D stage, relying on a provincial engineering technology center, it independently developed a proprietary composite system of alkali-resistant glass fibers and low-alkalinity cement, with fiber volume content strictly controlled at 3-5% to ensure coordinated load-bearing between matrix and fibers. Production uses German-imported spray-up forming equipment combined with 3D scanning positioning technology to achieve uniform fiber distribution and precise component forming; constant temperature and humidity curing kilns guarantee a 100% pass rate for 28-day strength, with key projects undergoing additional 90-day long-term strength monitoring. For different application scenarios, Qinglong provides customized solutions: cold-region projects use air-entrained GRC formulations to improve frost resistance, while coastal projects incorporate rust inhibitors and epoxy resin coatings to enhance salt-spray resistance. Taking the Nanjing East Road Century Plaza renovation project as an example, through optimized mix proportions and surface nano-coating treatment, its GRC light-transmitting components retained over 85% of their flexural strength after 500 freeze-thaw cycles at -15°C, far exceeding industry standards.

3. Strategies for Addressing Strength Degradation in Engineering Practice

In actual engineering practice, Qinglong advocates a management philosophy of “prevention first, monitoring as support.” At the design stage, BIM technology is used to simulate the stress states of components, optimizing anchoring joints and reinforcement schemes to avoid stress concentration; construction and installation employ modular hoisting and 3D laser calibration to ensure uniform load transfer. For strength assessment of GRC components in existing buildings, Qinglong has developed non-destructive testing technology that combines the ultrasonic rebound method with core drilling sampling to accurately identify internal defects. In after-sales maintenance, a nationwide 24-hour response mechanism has been established, with regular durability assessments of projects and reinforcement repair solutions provided. For example, when the GRC exterior wall of a coastal hotel developed localized cracking after 8 years of use, Qinglong's technical team restored the component strength to 92% of its initial value through carbon fiber cloth reinforcement and surface silane impregnation treatment, extending the service life by more than 15 years.

As a participant in formulating China's national GRC industry standards, Qinglong Group has always upheld the mission of “creating beautiful architecture,” integrating material strength control throughout the entire chain of detailed design, production, and installation. Through technological innovation and strict quality control, Qinglong's GRC products are not only widely used in domestic landmark projects (such as the Dongguan Women and Children's Activity Center) but also exported to overseas markets including Southeast Asia and Australia, demonstrating the technical strength of China's new building materials. Looking ahead, Qinglong will continue to explore UHPC and GRC composite application technologies, providing the construction industry with more durable and safer decorative solutions.