Analysis of the Impact of Exterior Wall GRC Thermal Expansion Coefficient on Construction and Coping Strategies

Thermal expansion and contraction pose an "invisible challenge" for building materials. Only by scientifically addressing the challenge of the GRC thermal expansion coefficient can enduring architectural aesthetics be achieved.

In the field of modern architectural decoration, GRC (Glass Fiber Reinforced Concrete) has become the preferred material for exterior wall decoration of high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength properties and rich sculptural versatility. However, as a composite material, GRC's thermal expansion coefficient acts like a "double-edged sword" during construction—it can accommodate minor deformations caused by temperature changes, yet improper handling may also lead to quality hazards such as cracking and warping. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, has drawn on more than a thousand engineering projects to deeply analyze the mechanism by which the thermal expansion coefficient affects GRC construction, and has developed a systematic response strategy.

### 1. GRC Thermal Expansion Coefficient: A Core Parameter Affecting Construction Quality

The thermal expansion coefficient of GRC materials typically ranges between 10-15×10⁻⁶/°C, influenced by multiple factors such as glass fiber content, cement matrix mix ratio, and curing process. During the construction phase, this parameter directly affects component installation precision, joint treatment quality, and long-term structural stability. For example, during summer construction in high-temperature regions, GRC components can expand by several millimeters during the day; without properly reserved expansion joints, this can easily cause compressive cracking of panel surfaces. In severe cold regions, winter contraction may cause seal failure at joints, creating water leakage risks. Qinglong Group laboratory data shows that standardizing control of thermal expansion coefficient deviation within ±2×10⁻⁶/°C can reduce the incidence of construction quality problems by more than 60%.

### 2. Key Points for Thermal Expansion Coefficient Control Throughout the Construction Process

**1. Parameter Optimization at the Detailed Design Stage** Qinglong's technical team conducts material thermal performance testing at the early project stage, combining 50 years of meteorological data from the project location with BIM technology to simulate the impact of seasonal temperature field changes on GRC curtain walls. For example, addressing the hot-summer, warm-winter climate of South China, a commercial complex project in Guangdong adopted "zoned elastic modulus design," controlling the thermal expansion coefficient of sun-facing components below 12×10⁻⁶/°C while relaxing it to 14×10⁻⁶/°C on shaded sides—ensuring safety while reducing costs.

**2. Process Control at the Manufacturing Stage** Relying on the automated production lines at its Nanning, Guangxi production base, Qinglong has raised the thermal expansion coefficient stability of GRC components to over 95% through precise control of the water-cement ratio (1:0.35-0.45) and glass fiber content (5-8%). Key components undergo a dual-stage process of steam curing plus natural curing to ensure uniform release of internal stress and prevent micro-cracks caused by temperature gradients.

**3. Dynamic Adjustment Technology for On-Site Installation** During the construction and installation phase, Qinglong's proprietary "three-dimensional adjustable anchoring system" absorbs thermal deformation through stainless steel sliding supports. Taking a landmark project in Shanghai as an example, for a 60-meter-high GRC curtain wall, each component was fitted with dual horizontal and vertical adjustment devices allowing ±30mm of displacement, successfully handling summer high-temperature expansion conditions. Meanwhile, low-modulus silicone sealant (elastic modulus ≤0.4MPa) was used to fill joints, with elongation reaching over 300%, effectively buffering the stress generated by thermal expansion and contraction.

### 3. Industry-Leading Full-Chain Solution Practices

As a national-level high-tech enterprise, Qinglong Group integrates thermal expansion coefficient control into the entire process of "detailed design - manufacturing - construction installation - after-sales maintenance." By participating in the formulation of industry standards such as the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), it has transformed 28 years of engineering experience into a standardized technical system. In overseas projects such as an airport curtain wall project in Malaysia, addressing the temperature variations characteristic of tropical climates, Qinglong innovatively adopted a "pre-tensioning installation process," keeping GRC components in optimal stress conditions under temperature changes—resulting in zero maintenance records in the 5 years since project delivery.

[Summary] Scientific management of the GRC thermal expansion coefficient is one of the core indicators of a company's technical strength. Grounded in material performance research and supported by engineering practice, Qinglong Group has, through technological innovation and process optimization, transformed the thermal expansion coefficient—an "implicit variable"—into a controllable parameter, providing designers with broader creative space and delivering more durable architectural works to owners. In the field of new architectural decoration materials, only by infusing professionalism into every technical detail can we fulfill the corporate mission of "creating beautiful architecture."