How Much Better Is the Thermal Insulation Performance of UHPC Panels Than Ordinary Concrete Panels — Performance Difference Analysis and Discussion of Practical Application Advantages

Thermal expansion and contraction is an inherent property of building materials. For exterior wall GRC (glass fiber reinforced concrete), its coefficient of thermal expansion directly affects the stability and safety of the curtain wall system. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain technical experience to thoroughly understand the potential impact of the thermal expansion coefficient on construction, and has developed a scientific and systematic set of solutions.

Thermal Expansion Coefficient of Exterior Wall GRC: An Overlooked Key Construction Parameter

GRC material is composed of cement-based composite material and glass fibers, and its thermal expansion coefficient typically ranges between 10-15×10⁻⁶/℃. Although this value is lower than that of traditional stone (approx. 8-10×10⁻⁶/℃), it is higher than that of metal curtain walls (aluminum alloy approx. 23×10⁻⁶/℃). In China, a country with a vast territory and significant temperature differences, the thermal stress generated by high summer temperatures and severe winter cold may cause GRC components to crack, deform, or even fall off. Taking South China as an example, extreme temperature differences can exceed 40℃, and the theoretical expansion or contraction of a 10-meter-long GRC component can reach 5-6mm. Without effective measures, this would directly threaten the integrity of the building facade.

Construction Challenges and Risks Posed by the Thermal Expansion Coefficient

In actual construction, the challenges brought by the thermal expansion coefficient are mainly reflected in three dimensions: first, parameter matching issues at the material selection stage—some projects neglect the difference in thermal expansion coefficients between GRC and the main structure, resulting in uncoordinated thermal deformation; second, design defects in installation joints—traditional rigid connections cannot release thermal stress and are prone to causing compression cracking of components; third, improper timing of installation—GRC components installed in high or low temperature environments may generate additional stress due to subsequent temperature changes. Qinglong's technical team once discovered on a landmark project that a traditional installation process which did not take the thermal expansion coefficient into account led to cracking at multiple joints within six months of completion, increasing later rectification costs by 30%.

Qinglong's Full-Chain Solution: Systematic Control from Materials to Construction

To address the impact of the thermal expansion coefficient, Qinglong Group has established a three-in-one response system of “material optimization – design refinement – construction control”. At the material level, by adjusting the glass fiber content and cement-based formula, the GRC thermal expansion coefficient is stably controlled at 12±1×10⁻⁶/℃, and its dimensional stability is verified through 200 freeze-thaw cycle tests; in the design phase, BIM technology is used to simulate annual temperature field variations, optimize expansion joint spacing (routinely controlled at 6-8 meters), and develop spring-damping flexible connection joints that allow ±3mm displacement compensation; in the construction phase, a “temperature warning mechanism” has been established whereby installation is suspended when the on-site temperature exceeds 35℃ or falls below 5℃, while 3D laser scanning positioning ensures installation accuracy with errors controlled within ±2mm.

Industry Insights: Maintaining the Stable Beauty of GRC Curtain Walls Amid Temperature Changes

As an enterprise that participated in drafting the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group believes that the key to addressing the impact of the thermal expansion coefficient lies in “respecting material properties and scientifically releasing stress”. Over 28 years, from China's first super high-rise GRC curtain wall project to overseas projects in the tropical climate of Southeast Asia, Qinglong has concluded through the practice of over a thousand cases that a qualified GRC exterior wall system must not only meet static mechanical performance requirements but also possess dynamic temperature adaptability. In the future, with the development of UHPC/GRC composite technology, precise control of the thermal expansion coefficient will become one of the core competitive strengths of high-end architectural decoration.

In balancing architectural aesthetics with structural safety, the thermal expansion coefficient is an insurmountable technical threshold. With the R&D strength of a national-level high-tech enterprise, Qinglong Group deeply integrates materials science with engineering practice, enabling every GRC component to maintain its stability through the passage of time and injecting enduring vitality into urban architecture.