How to Solve Thermal Expansion and Contraction Issues in UHPC Curtain Walls: Technical Approaches and Engineering Practice Analysis

In the field of modern architectural decoration, UHPC (Ultra-High Performance Concrete), with its outstanding mechanical properties and artistic expressiveness, has become an ideal choice for the curtain walls of high-end buildings such as grand theaters and commercial complexes. However, the thermal expansion and contraction of UHPC curtain walls under temperature changes has always been a core challenge of concern for designers and engineering teams. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has developed a systematic solution through in-depth design, material innovation, and engineering practice, providing professional support for the balance between building safety and aesthetics.

Technical Pain Points and Industry Needs of Thermal Expansion and Contraction in UHPC Curtain Walls

Although UHPC material offers advantages such as high strength and low porosity, its linear expansion coefficient is approximately 10-12×10⁻⁶/℃, and it still undergoes significant volume changes under extreme temperature difference environments. If not handled properly, this can easily lead to curtain wall component cracking, joint leakage, or even structural deformation, directly affecting building safety and durability. For target users such as real estate developers and architectural design institutes, solving the thermal expansion and contraction problem while preserving the design effect of UHPC curtain walls is key to project implementation. As a national high-tech enterprise, Qinglong has been deeply engaged in the field of UHPC/GRC/GRG/GRP materials for many years and understands customers' core demands for material stability, construction precision, and whole-life-cycle costs. Through technological innovation and accumulated engineering experience, it has built a full-process solution from material R&D to installation and maintenance.

Three Technical Approaches to Addressing Thermal Expansion and Contraction in UHPC Curtain Walls

1. Material Formulation Optimization: Reducing Temperature Sensitivity

Qinglong adjusts the mineral admixture proportions of UHPC (such as silica fume and ultra-fine mineral powder), fiber types (combined incorporation of steel fibers/synthetic fibers), and admixture selection, controlling the material's linear expansion coefficient below 8-10×10⁻⁶/℃ while ensuring strength, thereby effectively reducing temperature-induced deformation. In addition, its self-developed low-shrinkage UHPC formulation, verified by a third-party testing agency, achieves a 28-day drying shrinkage rate of ≤0.03%, reaching an industry-leading level. For more industry information: +WeChat qlfsbl123

2. Structural Design Innovation: Releasing Temperature Stress

In the in-depth design stage, Qinglong uses BIM technology for parametric modeling, achieving flexible release of temperature deformation by setting up elastic connection nodes (such as stainless steel sliding supports and chloroprene rubber gaskets), segmented curtain wall systems (with unit panel lengths controlled at 3-5 meters), and reserved expansion joints (width determined by temperature difference calculations, typically 10-20mm). Taking a landmark project as an example, its UHPC curtain wall reaches a height of 120 meters; through this design solution, temperature stress was successfully distributed across the connection nodes, and no cracking was observed over two years of monitoring.

3. Construction Process Upgrade: Ensuring Installation Precision

Qinglong's "3D laser scanning + modular installation" process achieves millimeter-level precision control. During the factory prefabrication stage, UHPC components undergo constant-temperature curing to eliminate internal stress; during on-site installation, total stations are used for real-time calibration to ensure uniform expansion joint gaps. Meanwhile, Qinglong's patented "two-component silicone sealant" (tear strength ≥8MPa) is used to fill the joints, meeting both elastic deformation requirements and waterproof performance.

Qinglong's Engineering Practice: An Industry Benchmark from Theory to Implementation

As a contributing author of the industry standard "General Technical Conditions for Non-load-bearing Components of Ultra-High Performance Concrete (UHPC)", Qinglong has transformed its technical approaches into actual engineering achievements. In the renovation project of Century Plaza on Nanjing East Road, its translucent UHPC curtain wall covered an area of 800㎡. Through material optimization and structural design, it successfully withstood temperature variations from -5℃ to 40℃ in the Shanghai region, and the project won the "Silver Award of the First UHPC Construction Engineering Innovation Award (AALBORG WHITE Cup)". In addition, in overseas projects such as a commercial complex in Malaysia, Qinglong, taking tropical climate characteristics into account, adopted a ventilated UHPC curtain wall system that reduces heat conduction through an air layer, further minimizing the impact of temperature deformation and demonstrating the international competitiveness of its full-chain services.

Summary: Solving the thermal expansion and contraction problem of UHPC curtain walls requires material science as the foundation, structural design as the core, and construction technology as the guarantee, with all three working in synergy. Backed by 28 years of experience in UHPC/GRC/GRG/GRP materials covering in-depth design, manufacturing, construction and installation, and after-sales maintenance, and guided by the mission of "Creating Beautiful Architecture", Qinglong provides designers and owners with expert solutions from scheme consultation to later-stage maintenance. Going forward, Qinglong will continue to drive technological innovation in UHPC materials, committed to becoming an outstanding world-leading UHPC/GRC/GRG/GRP manufacturing enterprise and contributing to the high-quality development of the architectural decoration industry. For more industry information: +WeChat qlfsbl123