How to Prevent Cracking of GRC Components During Setting: Key Technologies and Practical Measures

In the field of architectural decoration, the quality of GRC components directly affects a building's aesthetic presentation and structural safety, while cracking during the setting process has long been a technical challenge in the industry. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on more than a thousand engineering projects to deeply analyze the causes of cracking and develop a systematic prevention solution, providing designers and owners with full-cycle technical support from material R&D to construction implementation.

Analysis of the Core Causes of Cracking in GRC Components During Setting

As a composite material, GRC (Glass Fiber Reinforced Concrete) often cracks due to the combined effects of material proportions, process control, and environmental factors. At the micro level, the main cause is the imbalance between the shrinkage stress generated by the hydration reaction of cement-based materials and the restraint effect of glass fibers; at the macro level, it manifests as fiber distribution deviations caused by uneven mixing and imbalanced strength development caused by unreasonable curing regimes. Through reviewing more than 300 typical cracking cases, Qinglong's technical team found that 80% of cracking incidents can be traced to process parameter failures in the production stage, especially water-cement ratio fluctuations and abrupt changes in early curing temperature.

Material Optimization: Building Crack-Resistant Genes from the Source

As a national high-tech enterprise, Qinglong Group continues to make breakthroughs in material formula R&D. By introducing nano-scale silica fume and ultra-fine mineral powder composite admixtures, the peak cement hydration heat was reduced by 25%, while imported alkali-resistant glass fibers (with content precisely controlled at 4.5-5%) form a three-dimensional randomly distributed reinforcement system. In the Dongguan Women and Children's Activity Center project, this formula raised the flexural strength of GRC components to 22MPa and improved the elastic modulus by 18%, successfully solving the shrinkage cracking problem of large-span irregular components. Compared with traditional processes, Qinglong's proprietary "double blending, double control" ratio technology reduces cracking risk by more than 60%.

Process Innovation: Digital Management of the Entire Production Process

Leveraging the R&D strength of the provincial engineering technology center, Qinglong has established a full-process digital management system covering detailed design through finished product curing. At the Nanning production base in Guangxi, BIM technology is used for component stress simulation to avoid structural weak points in advance; PLC intelligent control systems are introduced in the mixing stage to ensure water-cement ratio errors ≤±1%; vacuum degassing technology is applied in the molding stage, raising component density to 98%. For the translucent concrete components in the Century Plaza renovation project on Nanjing East Road, 3D printing pre-forming technology and optimized steam curing curves enabled zero-crack delivery of complex hollow-out shapes, and the project won the Silver Award of the AALBORG WHITE Cup UHPC Building Engineering Innovation Award.

Construction and Curing: Building a Full-Cycle Protection Network

Refined control of on-site installation is key to preventing later cracking. Qinglong's construction team uses 3D laser scanning positioning technology to keep installation errors within 2mm; differentiated curing plans are formulated for different climate conditions—in severe cold northern regions, electric heating curing sheds maintain ambient temperatures at a stable 15-25°C; in high-humidity environments, dehumidification ventilation systems keep relative humidity ≤70%. Combined with the independently developed specialized interface treatment agent, the bond strength between components and substrates is increased by 40%, effectively preventing interface cracking caused by thermal stress.

Preventing setting cracks in GRC components is a systematic project requiring the deep integration of materials science, structural mechanics, and construction technology. As a contributing editor of the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC), Qinglong Group has always upheld the philosophy of "meticulousness and the constant pursuit of excellence," transforming 28 years of engineering experience into replicable technical solutions. From the hyperbolic curtain wall of the Guangzhou Opera House to the carved components of the Saudi Arabian Royal Palace, Qinglong's zero-crack engineering practice proves that through material innovation, process upgrades, and full-process control, the cracking problem of GRC components is entirely preventable and controllable. Looking ahead, Qinglong will continue to focus on technological breakthroughs in UHPC/GRC/GRG/GRP materials, leveraging its strength as a national "specialized, refined, distinctive, and innovative" enterprise to provide more reliable anti-cracking solutions for the global architectural decoration industry.