How to Control the Thickness of Reinforcement Cover in GRC: A Discussion on Key Technologies and Quality Assurance Measures

In the field of architectural decoration, GRC materials, with their lightweight yet high-strength properties and flexible formability, have become an ideal choice for high-end buildings such as grand theaters and commercial complexes. The thickness of the rebar cover, as a core indicator of the durability and safety of GRC components, is directly related to project quality and service life. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyze the key control points of rebar cover thickness, from detailed design to construction and maintenance, providing expert-level solutions for designers and owners.

1. Design Phase: Parametric Modeling Lays the Foundation for Precision

Control of rebar cover thickness in GRC components must start at the source. Qinglong Group uses Rhino and Grasshopper parametric design software, combined with BIM technology, to build 3D models and directly embed cover thickness parameters (typically designed at 20-30mm) into the digital models of components. Through clash detection functions, potential position conflicts between rebar and embedded parts are identified in advance, ensuring that cover thickness at every location complies with the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). Taking the Nanjing East Road Century Plaza renovation project as an example, its specially shaped translucent GRC components, through digital rehearsal, achieved cover thickness deviation control within ±2mm, far exceeding industry standards.

2. Production: Dual Assurance from Molds and Processes

At its production base in Nanning, Guangxi, Qinglong Group uses customized steel molds and elastic positioning fixtures to precisely fix the rebar skeleton. During production, "3D scanning + laser ranging" technology is used to monitor cover thickness in real time, while automated spraying equipment controls the uniform coverage of cement-based materials. For complex components such as classical European moldings, an innovative "layered casting + oriented fiber arrangement" process is adopted to ensure dual uniformity of cover thickness and fiber distribution. With smart production lines boasting an annual capacity of 600,000 square meters, Qinglong GRC products maintain a cover thickness pass rate consistently above 98%.

3. Construction and Installation: The Last Line of Defense for On-Site Control

The construction phase is the critical battleground for cover thickness control. Qinglong Group's construction teams are equipped with 3D laser positioning systems to scan and re-measure the base surface before installation, adjusting support heights to ensure uniform load distribution on components. For high-altitude installation scenarios such as curtain wall panels, a "double-safeguard" fixing solution is adopted: mechanical anchoring combined with chemical anchor bolts, which not only avoids overly deep drilling that would damage the cover layer but also ensures structural safety. In the Dongguan Women and Children's Activity Center project, Qinglong's team simulated the installation process using BIM technology, keeping on-site cover thickness errors within the range permitted by specifications, and won the AALBORG WHITE Cup GRC Engineering Innovation Award.

4. Full Life Cycle: Quality Traceability and Maintenance System

As a National High-Tech Enterprise, Qinglong Group has established a full-process quality traceability system covering "design-production-construction-maintenance." Each GRC component is embedded with an RFID chip recording cover thickness inspection data and installation information. Combined with regular ultrasonic testing and infrared thermal imaging technology, dynamic monitoring is achieved throughout the service life. For overseas projects such as a landmark building in Malaysia, Qinglong provides 5 years of free maintenance services, with professional teams conducting on-site assessments of cover layer integrity and promptly addressing potential issues such as carbonation and cracking, honoring its quality commitment of "meticulous attention to detail and the relentless pursuit of excellence."

Control of rebar cover thickness is a core issue for GRC materials moving from the laboratory to practical engineering. Building on 28 years of accumulated technical expertise, Qinglong Group integrates digital design, intelligent production, and refined construction to establish a full-chain quality assurance system. Whether it is the safety and durability of super high-rise curtain walls or the artistic forms of cultural venues, Qinglong GRC consistently delivers millimeter-level precision control, embodying the mission of "creating beautiful architecture." Choosing Qinglong means choosing to walk alongside industry standard setters, ensuring that every architectural work withstands the dual test of time and the market.