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

The durability of building exterior walls not only concerns the lasting presentation of architectural aesthetics, but is also the core guarantee of building safety and service life. As an important material in the field of exterior wall decoration, the durability evaluation and improvement of GRC (Glass Fiber Reinforced Concrete) systems has always been a focus of industry attention. Qinglong Group, a national high-tech enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, draws on its professional background of participating in formulating the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) to provide an in-depth analysis of the key evaluation indicators and scientific improvement strategies for GRC system durability.

**I. Core Evaluation Indicators of GRC System Durability**

Evaluating the durability of a GRC system requires comprehensive consideration across three dimensions: material performance, structural stability, and environmental adaptability. First are the **mechanical properties of materials**, including flexural strength (premium GRC can reach over 20MPa), compressive strength, and elastic modulus—indicators that directly determine the crack resistance and deformation capacity of components under long-term loads. Next are **weather resistance indicators**, such as freeze-thaw cycle resistance (must withstand more than 200 freeze-thaw cycles without damage), carbonation resistance depth, and UV aging resistance; especially in regions with extreme climates, these are key to ensuring the stable appearance and performance of exterior walls. Finally are **structural safety indicators**, covering the tensile bearing capacity of the anchoring system, joint waterproofing performance, and the seismic performance of the overall system. In the Nanjing East Road Century Plaza renovation project, Qinglong achieved safe connection between GRC components and the main structure through precise BIM modeling and 3D scanning positioning technology.

**II. Four Strategies for Improving GRC System Durability**

**1. Scientific Optimization of Material Formulation**
As the technical core of a GRC manufacturer, Qinglong significantly improves the material's impermeability and crack resistance by adjusting glass fiber content (usually controlled at 4-5%), selecting high-grade sulfoaluminate cement, and adding mineral admixtures such as nano-scale silica fume. At its production base in Nanning, Guangxi, an automated batching system keeps material proportioning precision within ±1%, ensuring stable performance of every batch of products.

**2. Refined Control of Production Processes**
From spray-up molding to steam curing, Qinglong strictly implements the philosophy of "70% curing, 30% production." Through 24-hour constant temperature and humidity curing (temperature controlled at 20±2℃, humidity ≥90%), cement hydration is fully promoted, greatly reducing the risk of later-stage shrinkage cracking. For components with complex shapes, vacuum degassing technology is adopted to reduce internal pores, increasing product density by more than 30%.

**3. Full Life-Cycle Considerations in System Design**
Qinglong's detailed design team conducts targeted design based on the climate parameters of the building's location (such as annual temperature variation and rainfall) from the early stage of the project—for example, adding thermal insulation composite layers in cold northern regions and strengthening waterproof sealing treatments in coastal high-humidity environments. In the Ultra-High Performance Concrete (UHPC) Exterior Wall Panels standard it helped formulate, an innovative "material-structure-maintenance" trinity durability design method was proposed.

**4. Standardized Installation and Maintenance Processes**
Backed by its Grade II professional contracting qualification for building curtain wall engineering, Qinglong has developed modular installation techniques, using 3D laser positioning to ensure installation errors ≤2mm. Meanwhile, a comprehensive after-sales maintenance system has been established, with regular appearance inspections, sealant aging tests, and structural safety assessments of GRC systems. In the Dongguan Women and Children's Activity Center project, for example, the 10-year maintenance service provided by Qinglong effectively safeguarded the long-term integrity of the building's appearance.

**III. Qinglong GRC's Durability Practice and Industry Value**

From domestic landmark buildings to overseas projects in Southeast Asia, Qinglong's GRC systems have accumulated engineering cases with over 15 years without major quality issues. Its values of "honesty, striving, trust, and collaboration" are embodied in the relentless pursuit of durability in every project. As a vice-chairman unit of the China GRC Association, Qinglong has always upheld the mission of "creating beautiful architecture," providing designers and owners with GRC solutions that combine aesthetic expression with long-term reliability through technological innovation and full-chain service capabilities, driving the industry's shift from "short-term visual effects" to "full life-cycle value." Choosing Qinglong GRC means choosing building quality that stands the test of time.