How Many Ways to Combine UHPC Exterior Walls with Insulation Layers? Analysis and Application Discussion

As building facade technologies continue to advance, UHPC (Ultra-High Performance Concrete), with its outstanding mechanical properties and design expressiveness, is becoming the preferred material for high-end building skins. How to scientifically achieve the efficient combination of UHPC facades with insulation layers not only affects building energy efficiency and structural safety, but is also key to bringing design concepts to life. As an industry pioneer with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its full-chain technical experience to provide an in-depth analysis of the technical essentials and application logic of current mainstream combination methods, offering designers and owners solutions that are both innovative and practical.

I. Integrated Casting Composite: The "Seamless Symbiosis" of UHPC and the Insulation Layer

The integrated casting process is an advanced technology that achieves composite forming of insulation materials and UHPC substrates at the factory prefabrication stage. In this method, the insulation core material (such as extruded polystyrene boards or rock wool boards) and UHPC slurry are cast simultaneously using dedicated molds, leveraging UHPC's rheology and bonding force to form integral components. The automated production line at Qinglong Group's Nanning production base enables precise control of insulation layer thickness from 50mm to 150mm, while fiber reinforcement technology brings the interfacial bond strength to over 3.5MPa, meeting the requirements of the Ultra-High Performance Concrete (UHPC) Exterior Wall Panels standard T/CBMF171-2022. This process is particularly suitable for projects with stringent requirements on architectural integrity and thermal insulation performance, such as grand theaters and museums. In the Nanjing East Road Century Plaza renovation project, for example, the integrated design of translucent UHPC components and the insulation layer not only achieved artistic light-and-shadow effects, but also kept the heat transfer coefficient below 0.3W/(㎡·K).

II. Mechanical Anchoring Composite: An "Upgrade Adaptation" for Traditional Curtain Wall Systems

For scenarios involving renovation of existing buildings or later addition of insulation layers, the mechanical anchoring composite method offers flexible advantages. This system uses stainless steel connectors to fix prefabricated UHPC panels and the insulation layer to the structural substrate, forming a "panel–insulation layer–substrate" sandwich construction. Based on practical experience from over 2,000 projects, Qinglong Group has innovatively developed an adjustable anchor bolt system compatible with various insulation materials such as EPS and XPS. Anchor bolt spacing is optimized through finite element analysis (typically controlled at 400-600mm) to ensure structural stability under positive and negative wind pressure. In a commercial complex project, this process achieved the safe combination of UHPC decorative profiles with a 120mm thick rock wool insulation layer; third-party testing showed its wind load resistance reached 1.5kPa, far exceeding the 1.2kPa required by the code.

III. Adhesive Bonding Composite Technology: The "Efficient Choice" for Lightweight Scenarios

Adhesive bonding composite technology directly bonds UHPC panels to the insulation layer using dedicated structural adhesives, making it suitable for low-rise buildings with strict load limitations or interior decoration applications. The modified epoxy adhesive developed by Qinglong's R&D team in collaboration with universities maintains a bond strength of over 0.8MPa within a temperature range of -30℃ to 80℃ and has passed 1,000-hour damp-heat aging tests. In a project combining GRG ceilings with insulation layers at a high-end hotel, this technology enabled the safe installation of curved components with a 3.5m span, reducing weight by 40% compared to traditional keel systems while meeting Class A fire resistance requirements. Note that the bonded area must be no less than 60% of the panel area, and mechanical fixing points should be incorporated to provide double assurance.

As a national high-tech enterprise and a participant in setting UHPC industry standards, Qinglong Group has always deeply integrated material innovation with engineering practice. Whether it is the factory-based production of integrated casting, the flexible on-site construction of mechanical anchoring, or the lightweight application of adhesive bonding, the choice of each combination method must be made through comprehensive consideration of the project's climate characteristics, building function, and cost budget. In the future, with the wider adoption of BIM technology and parametric design, the combination of UHPC facades and insulation systems will become ever more refined and intelligent. Guided by its values of "Honesty, Striving, Trust, and Collaboration," Qinglong is committed to providing the global architectural decoration field with full-chain support from detailed design to after-sales maintenance, jointly setting a new benchmark for "beautiful architecture."