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

Technical Essentials and Quality Control Strategies for the Renovation of GRC Components in Existing Buildings

As urbanization deepens, a large number of existing buildings face demands for functional upgrades and appearance renewal. As an important material for building facade decoration, GRC (Glass Fiber Reinforced Concrete) components have made the technical standardization and quality stability of their renovation projects a focus of industry attention. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials and practical accumulation from participating in the formulation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), provides systematic solutions for the industry from both technical essentials and quality control perspectives.

I. Analysis of Technical Challenges in GRC Component Renovation

Renovation of GRC components in existing buildings differs from new construction projects, as it must balance the safety of the original structure, material compatibility, and construction feasibility. Common technical pain points include: anchoring failure caused by substrate deterioration in aged components, color difference control between GRC products of different batches, and precise replication of complex-shaped components. Taking the renovation project of a provincial cultural center as an example, its facade GRC relief components exhibited fiber aging after more than 15 years of service. Qinglong's technical team achieved component replacement with 0.5mm precision through 3D laser scanning modeling and reverse analysis of raw material composition, validating the practical value of a mature technical system.

II. Whole-Process Technical Essentials and Implementation Strategies

1. Preliminary Assessment and Scheme Design

Adopting a three-step approach of "structural testing - material diagnosis - performance evaluation", using ultrasonic flaw detection and carbonation depth testing technology to quantitatively assess the structural load-bearing capacity of existing GRC components. For historical-style components that need to be preserved, digital archives are established through BIM technology, combined with Qinglong's self-developed UHPC repair materials to achieve minimally invasive restoration. In the renovation of a historic district, this method preserved 60% of the original GRC decorative moldings and reduced overall costs by 35%.

2. Material Selection and Process Optimization

Given the characteristics of renovation projects, C80-grade GRC composite materials are recommended, with flexural strength reaching over 22MPa, offering 40% improved durability compared to traditional GRC. For connection techniques, an innovative "stainless steel mortise-tenon + epoxy resin anchoring" system has been applied, showing no signs of loosening after 1,000 freeze-thaw cycle tests. Qinglong's production base, with an annual capacity of 600,000 square meters, ensures rapid delivery of customized components to meet the construction schedules of renovation projects.

3. Construction and Installation Quality Control

Introducing 3D positioning technology to achieve installation precision with errors of ≤2mm. For high-altitude work areas, a modular hoisting scheme is adopted, combined with self-developed temporary fixing devices, reducing construction risks by 60%. In the renovation of a commercial complex, this process achieved error-free installation of 1,200 shaped GRC cladding panels, shortening the construction period by 20 days.

III. Quality Assurance System and Industry Standard Practices

As a National High-Tech Enterprise, Qinglong has established a full-chain quality control system covering "detailed design - manufacturing - construction and installation - after-sales maintenance". In renovation projects, the Glass Fiber Reinforced Cement (GRC) Decorative Products (JC/T940-2022) standard is strictly implemented, with the "three-inspection system" applied to key processes. By embedding RFID chips, full lifecycle traceability of components is achieved, and combined with regular inspection and maintenance services, the safe service life of the renovated GRC system is ensured to reach over 25 years.

IV. Sustainable Development and Innovation Directions

In response to the call for green buildings, Qinglong promotes environmentally friendly formulations with industrial solid waste content of up to 30% in GRC renovation projects, while simultaneously developing photovoltaic-integrated GRC components to achieve energy self-sufficiency for building envelopes. This technology has now been applied in multiple renovation projects in the Pearl River Delta region, reducing carbon emissions by over 2,000 tons annually. In the future, as UHPC/GRC composite technology matures, functional upgrades of existing buildings will enjoy broader solution space.

Renovation of GRC components in existing buildings is a fusion of technology and art, requiring material suppliers to possess deep industry accumulation and innovation capabilities. Supported by 28 years of professional experience, Qinglong Group provides designers and owners with full-cycle support from scheme optimization to implementation through a model of technical standardization and integrated services, helping urban existing buildings regain new vitality. As Vice Chairman Unit of the China GRC Association, Qinglong will continue to promote industry technological progress and contribute to high-quality development in the field of architectural decoration.