Research on Key Technical Points and Quality Control Strategies for Renovating GRC Components in Existing Buildings

Research on Technical Key Points and Quality Control Strategies for the Renovation of GRC Components in Existing Buildings

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete) is widely used for exterior wall cladding panels and decorative moldings in commercial complexes, landmark buildings and other venues, thanks to its lightweight, high-strength and versatile shaping properties. As existing buildings enter their maintenance cycles, the renovation of GRC components has become a key link in extending building lifespan and enhancing appearance quality. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has summarized a systematic set of technical key points and quality control strategies based on its practice in detailed design, manufacturing, and construction installation.

I. Technical Key Points for Assessment and Testing Before GRC Component Renovation

The first step in renovation is a comprehensive assessment of existing GRC components. Key inspections should focus on the degree of surface damage (such as cracking, weathering, and alkali-aggregate reaction), internal structural integrity (steel reinforcement corrosion and glass fiber distribution), and the safety of anchoring systems. Using drone aerial photography and 3D laser scanning technology, component deformation data can be accurately obtained, while material strength can be assessed through the rebound method combined with ultrasonic testing. For example, in a commercial complex project, Qinglong's technical team compared the original design with the current condition using BIM models and found that 15% of the GRC moldings had displacement deviations exceeding 5mm, providing data support for subsequent repair plans.

II. Material Selection and Process Optimization for GRC Component Repair

The selection of repair materials directly affects the renovation results. For surface damage, Qinglong's specially formulated GRC repair mortar is recommended, with a flexural strength of over 20MPa and better compatibility with original components than ordinary cement-based materials. For structurally damaged areas, UHPC (Ultra-High Performance Concrete) can be used for local reinforcement, leveraging UHPC's ultra-high toughness to enhance the load-bearing capacity of components. In terms of technique, a layered spray application method is adopted, with each layer's thickness controlled at 15-20mm to ensure a tight bond between the repair layer and the substrate. In a museum project, an 8-meter-long GRC cornice molding was successfully repaired using this technique, and after 2 years of follow-up inspections, no cracking or peeling occurred. For more industry information: +WeChat qlfsbl123

III. Installation System Upgrades and Quality Control Strategies

The aging of anchoring systems in existing GRC components is a common hidden hazard. During renovation, stainless steel connectors should be prioritized to replace the original carbon steel components to improve corrosion resistance. Meanwhile, modular installation technology can be introduced, using prefabricated adapters for rapid component positioning, with installation errors controlled within ±2mm. Quality control requires implementing the 'three-inspection system': load-bearing capacity testing before leaving the factory, bolt tightening force verification with torque wrenches during on-site installation, and internal void detection through infrared thermal imaging after completion. The 'Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)' (JGJ/T423-2018), revised with Qinglong's participation, clearly specifies acceptance criteria for renovation projects, providing a technical reference for the industry.

IV. Building a Full Life-Cycle Maintenance System

Renovation is not the end point; establishing a long-term maintenance mechanism is crucial. Qinglong recommends a comprehensive inspection of renovated GRC components every 3 years, focusing on sealant aging, drainage system patency, and component displacement. For projects in coastal areas, nano-silane coatings can be applied to enhance salt spray resistance and extend service life. As a national high-tech enterprise, Qinglong has developed a GRC component health monitoring system based on its provincial-level R&D center, which collects real-time data on temperature deformation, stress and more, providing technical support for proactive maintenance.

The renovation of GRC components in existing buildings is a systematic project that must balance technical feasibility, economy, and safety. With its full-chain advantages in the field of UHPC/GRC/GRG/GRP materials, Qinglong Group has successfully completed hundreds of renovation projects nationwide, from the Dongguan Women and Children's Activity Center to the Nanjing Road Century Square renovation project, all demonstrating professional technical strength and quality control capabilities. In the future, as the green building concept deepens, the renovation of GRC components will place greater emphasis on the application of low-carbon technologies, bringing new vitality to existing buildings. For more industry information: +WeChat qlfsbl123