Analysis of the Main Factors Affecting GRC Strength Degradation: The Synergistic Effects of Raw Materials, Process, and Environment

The decline of GRC strength directly affects the safety and service life of architectural decoration, driven by the combined effects of multiple factors, including raw material quality, production processes, and the service environment. Qinglong, a national high-tech enterprise with 28 years of full-chain GRC experience, has summarized the core rules governing strength decline through thousands of project practices, providing designers and owners with a scientific basis for quality control.

Raw material quality is the foundation of GRC strength stability. As the reinforcement core, alkali-resistant glass fiber is prone to aging and corrosion in the alkaline cement environment if its zirconia content is insufficient (below 16%) or its surface treatment process is rudimentary, causing strength to decline year by year. Using high-alkali cement or expired products as cementitious materials will accelerate fiber erosion and the deterioration of hydration products. In the Panzhihua Third-Front Construction Cultural Tourism Demonstration Project in Sichuan, Qinglong selected low-alkali sulphoaluminate cement and highly alkali-resistant glass fiber, ensuring no strength decline for more than 20 years. Aggregate purity is equally critical: excessive mud content (over 1%) or the use of sea sand will reduce GRC density and create weak points in strength. Qinglong's three-tier raw material inspection system can effectively avoid this risk.

Precise control of the production process is key to avoiding early strength decline. Uneven mixing causes fiber agglomeration, preventing the reinforcement from taking effect; Qinglong uses automated twin-shaft mixing equipment to ensure a fiber dispersion uniformity error of ≤5%. If compaction is insufficient during the molding process, internal porosity increases and becomes a hidden danger of strength decline; the 15mm thick GRC carved panels for the Wuhan Han Show Theater were produced using a high-pressure spray molding process, increasing density by 30% and effectively delaying strength decline. Improper curing (such as early water shortage or sudden curing temperature changes) leads to insufficient hydration and the formation of micro-cracks; Qinglong combines steam curing with moisture-retention curing to ensure a hydration completion rate of ≥95%.

The service environment is the external key factor that accelerates or delays strength decline. Freeze-thaw cycles in cold regions cause internal moisture in GRC to freeze and expand, damaging the microstructure; Qinglong's freeze-resistant GRC, customized for northern projects, has a strength loss of ≤10% after 50 freeze-thaw cycles. Salt spray corrosion in coastal areas erodes the interface between the fiber and the cement matrix; by adding anti-corrosion admixtures and surface protective coatings, Qinglong achieved long-term stability in a salt spray environment for the National Service Center project in Singapore. Hot and humid environments are prone to mold growth and accelerated cement carbonation; Qinglong's GRC products, through the addition of mold inhibitors and optimized density, performed excellently in the Changying Global 100 Fantasy Park project in Hainan.

Leveraging the technical strength of its provincial-level R&D center, Qinglong has established a trinity strength decline control system covering "raw materials – processes – environment". In Luban Award projects such as the Pingshan High-tech Zone Comprehensive Service Center in Shenzhen, its GRC products have shown a strength decline rate far below the industry average under long-term monitoring. For owners and designers, choosing a supplier with full-chain quality control capability is the key to avoiding GRC strength decline risks. Guided by the principle of "meticulousness and the pursuit of excellence", Qinglong provides high-quality GRC products with stable strength for every project.