Cause Analysis and Solutions for Thermal Stress in Large-Area GRC Curtain Walls

Solving the temperature stress challenge and keeping GRC curtain walls standing strong through the test of time — 28 years of industry experience shows you how to achieve the perfect balance between architectural aesthetics and structural safety.

As modern architectural aesthetics pursue irregular curved surfaces and oversized panels, GRC (Glass Fiber Reinforced Concrete), with its advantages of light weight, high strength, and flexible shaping, has become an ideal choice for landmark building curtain walls. However, the stress problems generated by large-area GRC curtain walls under temperature changes often become a key challenge affecting project quality. As an industry technology leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of the causes of temperature stress and systematic solutions from three dimensions: material properties, design logic, and construction techniques.

I. The "Hidden Driver" of Temperature Stress in GRC Curtain Walls: The Dynamic Interplay Between Materials and Environment

The generation of temperature stress in GRC curtain walls is essentially the result of the combined effect of material properties and environmental factors. GRC components are mainly composed of cement-based materials and glass fibers, with a linear expansion coefficient of approximately 10×10⁻⁶/℃. When the ambient temperature changes by 10℃, a 10-meter-long component will expand or contract by 1mm. Under the scorching summer sun, curtain wall surface temperatures can reach over 70℃, forming a temperature difference of 30-40℃ with nighttime temperatures. If this periodic thermal expansion and contraction cannot be effectively released, it can easily lead to problems such as component cracking and loose connectors. In addition, Qinglong Group's laboratory data shows that when the moisture content of GRC changes by more than 5%, the stress generated by drying shrinkage and wet expansion, superimposed on temperature stress, causes the mechanical complexity of the curtain wall system to grow geometrically.

II. Control at the Source: Qinglong's Dual Breakthroughs in GRC Material Formulation and Structural Design

To solve the temperature stress problem, we must first start with material R&D and structural design. As a participating drafting unit of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group has built solutions through three technical paths: first, optimizing material proportions by combining low-alkalinity sulphoaluminate cement with alkali-resistant glass fibers, controlling GRC's elastic modulus at 25-30GPa to enhance the material's inherent crack resistance; second, innovating a dual reinforcement system of "steel skeleton + fiber mesh," achieving component flexural strength above 20MPa to meet structural load-bearing requirements under temperature stress; third, applying BIM technology for parametric joint design, precisely calculating expansion joint spacing (typically controlled at 6-8 meters) based on building height, orientation, and climate zones to ensure orderly release of temperature deformation.

III. Full-Process Management: Implementing Temperature Stress Solutions from Production to Installation

In the manufacturing stage, Qinglong Group's Guangxi production base adopts constant temperature and humidity curing technology, controlling the early shrinkage of GRC components within 0.03% to avoid hidden internal stress risks before leaving the factory. During the construction and installation stage, millimeter-level positioning is achieved through 3D laser scanning technology, and adjustable stainless steel connectors are used, allowing components a displacement compensation of ±30mm in three dimensions. For super-large-area curtain wall projects, Qinglong innovatively applied the "unitized curtain wall" installation method, pre-assembling GRC panels into units in the factory, with flexible connections between units absorbing temperature deformation. This technology was successfully applied in the Century Plaza renovation project on Nanjing East Road, achieving zero leakage and zero cracking for a 3,000㎡ GRC curtain wall.

IV. Long-Term Assurance: Smart Operation, Maintenance, and Full Life-Cycle Management of Qinglong GRC Curtain Walls

As a National High-Tech Enterprise, Qinglong Group has established a GRC curtain wall health monitoring system that uses stress sensors and temperature collection modules embedded in components to monitor stress states under temperature changes in real time. Combined with 28 years of after-sales maintenance experience, it has formed a full life-cycle service system of "quarterly inspections — annual assessments — five-year overhauls." Notably, Qinglong was the first in the industry to propose a "15-year warranty commitment for GRC curtain walls," intervening in advance against potential temperature stress risks through material performance degradation model predictions. This service standard has become an industry benchmark.

From material innovation to systematic solutions, Qinglong Group has always embraced the mission of "creating beautiful architecture," integrating temperature stress control technology into the full-chain service of GRC curtain walls. In hundreds of projects, including the Dongguan Women and Children's Activity Center and a landmark hotel in Malaysia, Qinglong GRC curtain walls have withstood more than 10 years of climate tests while maintaining structural stability and aesthetic integrity. Choosing a GRC manufacturer with full-chain capabilities is not only a guarantee of building safety, but also a commitment to the lasting presentation of design creativity.