Indicators for Measuring the Durability of Exterior Wall GRC Systems and Improvement Strategies

The durability of building facades is not only about the long-term presentation of architectural aesthetics, but also a core consideration for building safety and operation & maintenance costs. As an important choice for facade decoration systems, GRC (Glass Fiber Reinforced Concrete) has been widely applied in grand theaters, commercial complexes, landmark buildings and other scenarios, thanks to its advantages of lightweight high strength and flexible shaping. However, how should the durability of GRC systems be scientifically measured, and through what strategies can performance be improved? As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, Qinglong Group will provide professional analysis for designers and owners based on material fundamentals and engineering practice.

I. Core Measurement Indicators of GRC System Durability: Full-Dimension Evaluation from Material to Engineering

Measuring the durability of GRC systems requires building a multi-dimensional evaluation system covering three major levels: material performance, structural design, and environmental adaptability. First, the mechanical properties of the material itself are the foundation, including flexural strength (premium GRC can reach over 20MPa), compressive strength, and elastic modulus; these indicators directly determine the load-bearing capacity and deformation resistance of components. Second, impermeability and frost resistance are key to resisting natural erosion. By testing water absorption rate and the number of freeze-thaw cycles withstood (e.g., no obvious damage after more than 200 freeze-thaw cycles), the applicability in rainy and severely cold regions can be effectively evaluated. In addition, the alkali resistance of alkali-resistant glass fibers and the stability of the cement matrix determine the long-term mechanical property retention rate of GRC components, preventing structural failure caused by fiber corrosion.

In engineering applications, the overall durability of the system also requires consideration of the reliability of anchoring structures and interface treatment processes. The “Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)” (JGJ/T423-2018), in whose formulation Qinglong Group participated, explicitly requires that the connection between GRC components and the main structure should satisfy the combined effects of wind load, seismic action, and temperature deformation, and that its durability should match the service life of the main building. By adopting stainless steel connectors, anti-corrosion coatings, and flexible sealing technologies, the corrosion risk of the anchoring system can be significantly reduced, ensuring the long-term safety of the GRC facade system.

II. Strategies for Improving GRC System Durability: From Technological Innovation to Full-Process Control

Improving the durability of GRC systems requires closed-loop management from material formulation and production processes to construction and maintenance. At the material R&D level, Qinglong Group improves matrix density and impermeability by optimizing cement matrix mix ratios and incorporating active admixtures such as silica fume and mineral powder; meanwhile, it adopts highly alkali-resistant glass fibers (e.g., zirconia content ≥16%) and controls fiber volume content at 3%-5% to ensure the long-term mechanical properties of the material. In the production stage, automated spray molding and steam curing processes are adopted to enable components to meet 90-day age strength standards, reducing the risk of later shrinkage cracking.

In engineering practice, detailed design is key to improving durability. Relying on BIM technology and parametric design capabilities, Qinglong Group conducts structural force simulation for complex-shaped GRC components, optimizing reinforcement design and node construction—for example, adopting bidirectional fiber arrangement in hyperbolic components to improve flexural strength. During the construction stage, 3D laser scanning positioning and modular installation ensure component splicing precision and reduce stress concentration caused by installation errors. In addition, establishing a comprehensive after-sales maintenance system, with regular inspection and replacement of GRC surface coatings and sealing strips, can effectively extend the service life of the system.

III. Qinglong's GRC System Durability Practices: From Standard Formulation to Project Verification

As a national high-tech enterprise and participant in GRC industry standard formulation, Qinglong Group integrates the durability concept throughout its full-chain services. In the Dongguan Women and Children's Activity Center project, customized GRC facade panels were adopted; through material formulation optimization and detailed structural design, the components have remained crack-free and fade-free for 15 years in the coastal high-humidity environment. In the Century Plaza renovation project on Nanjing East Road, light-transmitting GRC components combined with UHPC material characteristics achieved a balance between strength and light transmittance, and their durability passed 200 freeze-thaw cycles and 5,000-hour aging resistance tests.

For designers and owners, choosing a GRC system is not merely choosing a decorative material, but choosing a complete durability solution. Backed by 28 years of engineering experience, Qinglong Group deeply integrates material performance with engineering practice through the full-chain services of “detailed design - manufacturing - construction & installation - after-sales maintenance,” providing reliable assurance for the long-term stability of building facades. In the future, with the development of UHPC and GRC composite technologies, Qinglong will continue to drive durability innovation in new architectural decoration materials, helping to realize the mission of “creating beautiful architecture.”