Analysis of the Causes and Solutions for Thermal Stress Problems in Large-Area GRC Curtain Walls

Solving the Temperature Stress Challenge in GRC Curtain Walls: A Full-Chain Solution Built on 28 Years of Industry Experience

As the trend toward artistic expression in modern building skins intensifies, large-area GRC curtain walls have become the preferred decorative system for landmark buildings thanks to their high design freedom and rich texture. However, stress cracking caused by temperature changes has long been a technical pain point troubling the industry. As a national high-tech enterprise with 28 years of experience in detailed design, manufacturing, construction and installation, and after-sales maintenance of UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on more than a thousand engineering projects to deeply analyze the causes of temperature stress and build a full-chain solution covering everything from material R&D to operation and maintenance support.

Underlying Causes of Temperature Stress in GRC Curtain Walls and Industry Challenges

As a composite building material, glass fiber reinforced concrete (GRC) experiences temperature stress primarily from three core contradictions: first, the difference in thermal expansion coefficients between cement-based materials and glass fibers, which generates interfacial shear stress under ambient temperature fluctuations from -30°C to 70°C; second, the restraint effect of large-area curtain wall panels, where traditional rigid installation systems struggle to release thermal deformation energy; third, the superposition of drying shrinkage stress caused by humidity gradient changes on top of temperature stress. In one commercial complex project, failure to account for day-night temperature differences of up to 15°C led to through cracks appearing six months after completion—a typical case of temperature stress running out of control. Qinglong Group's laboratory data shows that high-quality GRC components must keep their elastic modulus variation rate within 8% in temperature cycling tests to effectively resist stress fatigue.

Material Innovation: From Formulation Optimization to Performance Upgrades

Materials are the foundation for solving the temperature stress challenge. Qinglong Group has achieved breakthroughs through three technical paths: first, adopting a low-alkali sulphoaluminate cement system that reduces peak hydration heat by 40%, combined with nano-scale silica fume admixtures to stabilize the linear expansion coefficient of GRC components at 8×10⁻⁶/°C; second, developing hybrid reinforcement technology combining basalt fibers with glass fibers, raising the material's ultimate tensile strain to 0.8%, far exceeding the industry average of 0.5%; third, introducing phase-change energy storage microcapsules that buffer drastic temperature changes through latent heat exchange. These innovations allow Qinglong GRC products to retain a flexural strength of 92% after 100 freeze-thaw cycles, outperforming the requirements of the JGJ/T423-2018 standard.

System Design: Engineering Practice of Dynamic Release Mechanisms

In the detailed design phase, Qinglong Group uses BIM technology to build temperature field simulation models and precisely calculate stress distribution across different zones. Key technologies include: a "floating" bearing system that allows panels to move ±20mm in the X/Y/Z directions; segmented expansion joints spaced at 6-8 meters, paired with elastic sealant for dynamic sealing; and three-dimensionally adjustable hangers that absorb thermal deformation through stainless steel spring assemblies. In a cultural center project in Nanjing, this system successfully reduced the temperature stress concentration coefficient of a 2,000 m² GRC curtain wall to 0.6, well below the code limit of 1.0.

Full-Chain Control: A Quality Closed Loop from Production to Operation and Maintenance

As a professional manufacturer integrating detailed design, manufacturing, construction and installation, and after-sales maintenance, Qinglong Group has established a full-process quality control system: in production, an intelligent steam curing curve control system ensures the strength uniformity of components; in construction, 3D laser scanning positioning keeps installation accuracy within ±3mm; in operation and maintenance, a stress monitoring cloud platform delivers real-time early warnings through embedded optical fiber sensors. This "design-production-construction-O&M" full-chain service model has enabled projects undertaken by Qinglong, such as the Dongguan Women and Children's Activity Center, to achieve a 10-year zero-cracking record for their GRC curtain walls.

Temperature stress control is a core proposition of GRC curtain wall technology and a comprehensive test of a material supplier's overall strength. Building on 28 years of accumulated industry experience, Qinglong Group provides designers and owners with expert-level solutions from concept to operation and maintenance through the deep integration of material innovation, system design, and full-chain services. Looking ahead, with continued R&D on UHPC/GRC composite systems, Qinglong will continue to lead the industry's technological upgrades, keeping building skins in a perfect balance of structural safety and artistic beauty through temperature changes.