What Are the Technical Key Points for Renovating Existing Building GRC Components?

Key Technical Points for the Renovation of GRC Components in Existing Buildings

With the acceleration of urban renewal, the renovation of GRC components in existing buildings has become a key step in improving building quality. As an industry leader with 28 years of experience in the detailed design, manufacturing, construction and installation, and after-sales maintenance of UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the complexity and professionalism involved in the renovation of GRC components. This article systematically expounds the core technical points of renovating GRC components in existing buildings from four dimensions—inspection and assessment, material selection, construction techniques, and quality control—providing professional solutions for designers, owners, and construction units.

Comprehensive Inspection and Assessment Before GRC Component Renovation

The first step in renovating GRC components of existing buildings is scientific inspection and assessment. Qinglong's technical team recommends a combined solution of "3D scanning + non-destructive testing": precise dimensions and deformation data of components are obtained through 3D laser scanning, combined with ultrasonic flaw detection and rebound method testing of concrete strength, with a focus on identifying structural hazards where crack width exceeds 0.2mm. For GRC components in service for more than 15 years, sampling tests are required for glass fiber content (standard value ≥4%) and the degree of alkali-aggregate reaction to ensure the safety and economy of the renovation plan. In the renovation project of the Dongguan Women and Children's Activity Center, Qinglong successfully identified 3 hidden cracking risks through this assessment system, avoiding major safety hazards in subsequent construction. For more industry information: +WeChat qlfsbl123

Selection and Adaptation Technology of High-Performance GRC Materials

Material selection for renovation directly affects project quality and durability. Qinglong recommends the new generation of GRC materials certified under the JC/T940-2022 standard, whose flexural strength is increased to over 20MPa and frost resistance reaches grade D50. For different scenario requirements, options include: stone-textured GRC panels (suitable for facade restoration of historic buildings), translucent GRC components (innovatively applied in the Nanjing East Road Century Plaza renovation project), and ultra-light GRC (surface density ≤180kg/㎡). Notably, the compatibility of new materials with the existing substrate must be verified through on-site pull-out tests, with anchorage force ≥0.3MPa. Qinglong's production base, with an annual capacity of 600,000 square meters, ensures the rapid supply of customized materials to meet project schedule requirements.

Refined Construction Techniques and Installation Technology Innovation

The construction techniques for renovating GRC components of existing buildings must balance safety with minimal invasiveness. Qinglong's developed "cutting-anchoring-joining" three-step construction method uses waterjet cutting technology to achieve vibration-free demolition, new stainless steel back bolts (diameter ≥8mm) combined with epoxy resin anchoring, and BIM technology for pre-assembly to control installation errors within ±2mm. For curved GRC components, parametric modeling and 3D-printed mold technology are applied; for example, in a Grand Theater renovation project, Qinglong successfully completed the precise installation of a double-curved GRC ceiling with a 300mm radius. During construction, alkali-resistant back coating and flexible sealing techniques must be implemented simultaneously to prevent later efflorescence and cracking issues.

Full Life-Cycle Quality Control and Maintenance System

High-quality renovation projects depend on sound quality control and maintenance mechanisms. Qinglong has established full-chain management from detailed design to after-sales maintenance: RFID chip traceability is implemented in the production stage, 3D scanning provides real-time monitoring during installation, and 5 years of free maintenance service is provided after completion. For projects in coastal areas, GRC surface fluorocarbon coating treatment is specially strengthened (thickness ≥60μm), improving salt spray resistance to more than 1,000 hours. As a participating editor of the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)", Qinglong implements standardized management throughout, ensuring that every square meter of GRC components complies with national code requirements. For more industry information: +WeChat qlfsbl123

The renovation of GRC components in existing buildings is a fusion of technology and art, requiring the combined support of material innovation, process optimization, and accumulated experience. With 28 years of professional expertise, Qinglong Group has completed hundreds of GRC renovation projects nationwide—from the facade renovation of a commercial complex in Guangzhou to the restoration of landscape components in Nanning's municipal projects—all delivered as premium projects with a meticulous, excellence-pursuing attitude. Going forward, Qinglong will continue to explore UHPC/GRC composite application technologies, providing more innovative and sustainable solutions for urban renewal and helping realize its corporate mission of "creating beautiful architecture".