How Many Ways Can UHPC Exterior Walls Be Combined with Insulation Layers? Application Analysis

The integration of thermal insulation and decoration in building exterior walls is a core topic in contemporary energy-efficient architectural design. Ultra-High Performance Concrete (UHPC), with its outstanding mechanical properties and design flexibility, is becoming the preferred material for exterior wall systems. As an industry-leading enterprise with 28 years of experience in detailed design and full-chain services for UHPC/GRC/GRG/GRP materials, Qinglong Group has developed multiple efficient solutions for combining UHPC exterior walls with insulation layers through technological innovation and engineering practice, providing dual assurance for building energy efficiency and aesthetic expression.

### Composite Construction of UHPC Exterior Walls and Insulation Layers: An Analysis of Three Main Combination Methods

**1. Layered Adhesive Composite System: Balancing Lightweight Design and Construction Convenience**

The layered adhesive method is currently the most widely used combination approach. Its core process involves directly bonding precast UHPC panels to the insulation layer (such as EPS, XPS, or rock wool) using specialized adhesives, forming a composite structure of "insulation layer + UHPC finish layer." At its Nanning production base, Qinglong Group achieves precision precasting of UHPC panels through automated production lines, with panel thickness controllable within 20-30mm. Combined with high-strength epoxy adhesives, the bonding strength with the insulation layer is guaranteed to exceed 1.5MPa. This system is suitable for buildings under 100 meters and has performed outstandingly in commercial complexes and high-end residential projects. For example, a landmark project in a coastal city achieved a remarkable 30% reduction in exterior wall dead weight and a 40% improvement in construction efficiency through this process.

**2. Cavity Insulation Integrated System: Dual Upgrades in Performance and Safety**

To meet the needs of cold regions and super high-rise buildings, Qinglong's cavity insulation integrated system innovatively incorporates a composite construction of air layer and insulation layer between UHPC panels and the wall structure. Through metal keel supports optimized with BIM technology, the UHPC finish panels and insulation materials form a "breathing" cavity structure, which not only solves the thermal bridge problem (thermal conductivity can be as low as 0.03W/(m·K)) but also enhances wind pressure resistance through physical fixing (capable of withstanding Force 12 typhoon loads). This system has been successfully applied in an exhibition center project in northern China. Its insulation layer adopts a composite design of fire-resistant rock wool and vacuum insulation panels, achieving the design goal of 75% energy savings, while passing 1,500 thermal cycle tests conducted by the National Construction Curtain Wall Testing Center.

**3. Sandwich Casting Composite System: Deep Integration of Structure and Insulation**

As a technical breakthrough in UHPC material applications, the sandwich casting composite system uses the insulation layer as the built-in core material of UHPC components, forming a sandwich structure of "UHPC surface layer + insulation core layer + UHPC back layer" through factory precasting. Qinglong Group's self-developed ultra-high-pressure casting process raises the interface bonding strength between UHPC and the insulation layer beyond 2.0MPa, with component flexural load capacity reaching 35MPa, fully meeting curtain wall structural safety requirements. This system shone brilliantly in the Nanjing East Road Century Plaza renovation project. Its translucent UHPC sandwich components not only achieved 30% light transmittance but also reduced the heat transfer coefficient to 0.8W/(m²·K) through the built-in insulation core material, becoming an exemplary case of energy-saving renovation for existing buildings.

### Full-Chain Service Empowerment: A Value Closed Loop from Design to Maintenance

As a National High-Tech Enterprise and a participant in establishing UHPC industry standards, Qinglong Group has built a full-chain service system covering detailed design, manufacturing, construction and installation, and after-sales maintenance. In the design phase, parametric design software (Rhino+Grasshopper) enables collaborative optimization of complex shapes and insulation performance; in production, automated production lines with an annual capacity of 600,000 square meters ensure component dimensional precision of ±0.5mm; in construction, 3D laser scanning positioning technology achieves "zero-error" installation; in the after-sales phase, a 5-year warranty and lifetime maintenance mechanism has been established, with an IoT monitoring system providing real-time insight into exterior wall performance status. This full life-cycle service capability has enabled Qinglong's UHPC exterior wall systems to be widely applied in real estate, municipal, and cultural tourism sectors. Cooperation clients include renowned real estate groups such as Poly and China Overseas, with products exported to overseas markets including Southeast Asia and Australia.

From material innovation to system integration, the technology of combining UHPC exterior walls with insulation layers is reshaping the performance boundaries of building skins. With 28 years of industry experience as its foundation, Qinglong Group has flexibly applied three composite construction solutions, not only meeting the mandatory standard of 75% building energy efficiency but also providing designers with possibilities for aesthetic expression that break through convention. Driven by the "dual carbon" goals, this solution combining both performance and artistic value will become an important direction for the future development of green buildings.