Close Packing Design Principles of UHPC Matrix Materials and Their Practical Applications

Solving the Temperature Stress Challenge, Safeguarding GRC Curtain Wall Safety—Qinglong's Systematic Solution Built on 28 Years of Technical Expertise

Under the dual pursuit of modern architectural aesthetics and structural safety, GRC (glass fiber reinforced concrete) curtain walls have become the preferred decorative material for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to their light weight, high strength, and flexible shaping. However, stress problems caused by temperature changes have long been an industry pain point—at best causing component cracking that affects aesthetics, and at worst threatening the structural safety of curtain walls. As a national high-tech enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on more than one thousand engineering projects to deeply analyze the causes and mechanisms of temperature stress in large-area GRC curtain walls, and has built a complete solution covering everything from material R&D to construction and maintenance.

Analysis of the Three Core Causes of Temperature Stress in GRC Curtain Walls

The essence of temperature stress lies in the combined effect of the thermal expansion and contraction of materials and the constraint conditions of the building. In large-area GRC curtain wall systems, the causes mainly fall into three dimensions. First, differences in the physical properties of the materials themselves: the coefficient of linear expansion of GRC panels differs significantly from that of metal support frames (approximately 10×10⁻⁶/°C for GRC and 23×10⁻⁶/°C for aluminum alloy), so interface shear stress easily arises as ambient temperatures fluctuate. Second, complex temperature field distribution: the temperature difference between the sun-facing and shaded sides of a building, and between day and night, can exceed 20°C, causing non-uniform deformation of curtain wall panels. Finally, overly strong structural constraints: traditional rigid connection designs restrict the free expansion and contraction of GRC components, turning temperature deformation into accumulated internal stress. A landmark project once saw through-cracks appear across 1,200㎡ of GRC curtain wall because the extreme temperature difference from -15°C in winter to 60°C in summer had not been considered—a typical case of temperature stress spiraling out of control.

Qinglong's Full-Chain Solution: Systematic Prevention and Control from Materials to Operation and Maintenance

To tackle the temperature stress challenge, Qinglong Group has innovatively proposed a four-dimensional solution of “material optimization - structural design - construction technology - intelligent monitoring.” At the material R&D level, incorporating basalt fiber and modified polymers reduces the elastic modulus of GRC panels by 15% while raising their ultimate elongation to 3.5%, giving the material stronger deformation-buffering capacity. In structural design, the “flexible connection + zoned release” technology is adopted, with customized adjustable supports developed to allow each GRC panel a displacement compensation of ±30mm in the X/Y/Z directions—a technology certified under the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). During construction, BIM + 3D scanning technology keeps installation errors within ±2mm, and stress sensors are installed at key nodes to monitor temperature deformation data in real time. In after-sales maintenance, supported by a nationwide service network, a quarterly special inspection mechanism for temperature stress has been established, forming a closed-loop management cycle of “design - production - construction - maintenance.”

Engineering Proof: A Report Card of Safety Built on 28 Years of Technical Expertise

As a vice-chairman unit of the China GRC Association, Qinglong Group has successfully applied its temperature stress control technology to benchmark projects such as the Century Plaza renovation on Nanjing East Road and the Dongguan Women and Children's Activity Center. In one culture and arts center project featuring a 28,000㎡ GRC curtain wall, the patented “gradient elastic modulus composite structure” kept the curtain wall's surface flatness error within 3mm/m even after temperature cycling tests from -18°C to 58°C—a 60% improvement in stability over traditional processes. This achievement confirms Qinglong's technical advantages across the full chain of GRC detailed design, manufacturing, and installation, and demonstrates the innovative strength of a national “specialized, refined, distinctive, and innovative” enterprise.

Temperature stress control is the lifeline of GRC curtain wall safety—and a true touchstone of a material supplier's technical strength. Guided by its mission of “creating beautiful architecture,” Qinglong Group will continue to deepen its R&D in UHPC/GRC/GRG/GRP material technologies. Drawing on 28 years of accumulated full-chain service experience, it provides designers and owners with expert-level solutions from design optimization to long-term maintenance, ensuring that every GRC curtain wall combines artistic beauty with structural stability to become a safe, scenic highlight on the city skyline.