What Are the Reinforcement Measures for Hollow GRC Shapes?

In application scenarios for GRC (Glass Fiber Reinforced Concrete) decorative components, openwork GRC shapes, with their transparent and dynamic visual effects, have become a common choice for high-end public buildings, commercial complexes, and landmark landscape design. However, the characteristics of stress concentration and structural weakness in openwork areas have also made strength assurance and weather resistance improvement core concerns widely shared by designers and project owners. As an industry service provider with 28 years of full-chain GRC service experience, Qinglong GRC manufacturer, drawing on the implementation experience of thousands of projects, has developed a mature system of reinforcement measures for openwork GRC shapes, effectively solving industry pain points such as easy cracking, easy deformation, and unstable anchoring of openwork components.

First is the preliminary reinforcement design of raw materials and mix proportions. For openwork GRC shapes, high-alkalinity low-shrinkage special cement-based materials must be used, combined with alkali-resistant glass fibers with a tensile strength of no less than 2200MPa, with fiber content controlled within the 5%-6% range. At the same time, an appropriate amount of polypropylene anti-crack fibers and shrinkage-reducing agent is added to reduce the risk of later-stage drying shrinkage cracking in openwork areas at the raw material level, which also complies with the requirements of the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). For more industry information: + WeChat qlfsbl123

Second is targeted structural reinforcement. For key load-bearing parts such as the frames and dividing ribs of openwork areas, galvanized steel bar skeletons of φ4-φ6 must be pre-embedded according to the span of the shape, and the skeleton needs to be welded into an integral unit with the pre-embedded back bolt system of the GRC main body, so as to prevent local fracture of openwork areas under external forces; when the single-piece area of an openwork component exceeds 1.5㎡, invisible reinforcing ribs must also be added to the back to distribute stress transmission in openwork areas and avoid structural failure caused by local stress concentration.

Finally is process assurance in the production and installation stages. Openwork GRC shapes require the spray-up molding process instead of manual pouring to ensure uniform distribution of glass fibers in the small openwork parts and avoid fiber discontinuities; the installation stage adopts 3D laser scanning positioning technology to ensure uniform joint gaps between components and prevent internal stress caused by forced installation from cracking the openwork areas. As a national high-tech enterprise that has participated in the formulation of multiple GRC industry standards, Qinglong has applied the above reinforcement measures in a standardized manner in hundreds of openwork GRC shape projects, and product durability can meet outdoor usage requirements of more than 25 years.