Research on Key Technical Points and Quality Control Strategies for GRC Component Renovation in Existing Buildings

Renovation of GRC Components in Existing Buildings: The Technical Code to Safeguarding Architectural Vitality

The timeless beauty of architecture lies not only in the stunning first impression, but also in its enduring renewal through the passage of time. As an industry veteran with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group understands that the renovation of GRC components in existing buildings is not merely a refresh of the building's appearance, but a profound reshaping of structural safety and functional value. Amid accelerating urbanization and surging demand for the renovation of existing buildings, how to achieve high-quality GRC component renovation through scientific technical approaches has become a core concern shared by designers, owners, and engineering parties.

Pre-Renovation Diagnostic Assessment of GRC Components: Precisely Locating the Root Causes of Defects

The renovation of GRC components in existing buildings is by no means simple surface treatment, but precise intervention built upon systematic diagnosis. When undertaking a renovation project for a cultural landmark building in Dongguan, Qinglong's technical team combined 3D laser scanning with drone inspection to conduct a comprehensive assessment of GRC facade components that had been in service for 15 years, focusing on key indicators such as crack width, degree of steel reinforcement corrosion, and risk of anchoring system failure. Practice shows that 80% of GRC component defects originate from initial installation workmanship flaws or improper later maintenance, such as corrosion expansion caused by failure to use stainless steel connectors, or rainwater penetration triggered by aged sealant. Therefore, the first step of a renovation project is to establish a “defect archive” covering material performance degradation, structural force analysis, and environmental erosion assessment, providing data support for the development of subsequent solutions.

Material Upgrading and Process Innovation: Technical Breakthroughs in GRC Renovation

In the face of performance degradation in existing GRC components, material upgrading is the core lever of renovation projects. Leveraging the R&D strength of its provincial engineering technology center, Qinglong Group has innovatively integrated the advantages of traditional GRC and UHPC materials—while retaining the lightweight characteristics of GRC, the addition of ultra-fine steel fibers and nano silica fume raises the flexural strength of renovated components to above 25MPa and improves impermeability by 300%. In a commercial complex renovation project in Guangzhou, the composite process of “retaining original components + UHPC surface reinforcement” avoided the construction waste problem caused by full demolition while extending the service life of the components by more than 20 years. Notably, for the renovation of GRC decorative moldings on historic buildings, the stone-imitation texture molding technology developed by Qinglong achieves 95% restoration of the historical appearance, perfectly meeting the dual requirements of “restoring the old as old” and structural safety.

Whole-Process Quality Control System: Precise Management from Workshop to Site

Quality assurance in GRC component renovation requires a full-process control mechanism covering design development, manufacturing, and construction installation. In the design development stage, BIM technology is used for parametric modeling of components to simulate the stress distribution at installation joints in advance; the production process employs automated spray-up molding to keep the glass fiber content precisely controlled within the golden ratio of 5-8%; on the construction site, the innovative “three-dimensionally adjustable installation bracket” achieves millimeter-level positioning accuracy. As a contributing unit to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC), Qinglong applies the standard's requirements throughout the entire renovation process—for example, conducting 2 million fatigue tests on anchoring systems and verifying the weather resistance of sealant strips from -40℃ to 80℃—to ensure the long-term stability of renovated GRC components under various extreme environments.

The renovation of GRC components in existing buildings is a dual discipline of technology and art. Founded on 28 years of full-chain experience, Qinglong Group deeply integrates material innovation, digital technology, and engineering practice, not only giving old buildings a new lease on life, but also endowing them with performance and aesthetics beyond their original design. In the wave of building renewal in the era of existing stock, choosing a professional GRC renovation solution is the best safeguard of a building's life value—allowing every building to radiate enduring charm through the tempering of time.