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

**UHPC Facade and Insulation Layer Integration: Deep Fusion of Technical Innovation and Engineering Practice**

In contemporary architectural design, facade systems are not only a carrier of architectural aesthetics but also a core barrier for achieving energy efficiency, durability, and safety. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has consistently driven the upgrading of building envelope systems through technological innovation. This article focuses on the integration technology of UHPC facades and insulation layers, analyzing from material properties, structural design, to engineering applications how scientific composite solutions balance building performance with design requirements.

**I. Core Technical Approaches for Combining UHPC with Insulation Layers**

UHPC (Ultra-High Performance Concrete), with its ultra-high strength (compressive strength ≥150MPa), excellent durability, and precision forming capability, has become an ideal base material for facade systems. Its combination with insulation layers must balance mechanical load-bearing, thermal performance, and construction adaptability, and is mainly divided into three technical directions:

1. **Integrated Precast Composite System** Through factory precasting, UHPC panels are composited with insulation layers (such as rock wool and XPS boards) to form a "UHPC-insulation layer-backing layer" sandwich structure. In the Dongguan Women and Children's Activity Center project, Qinglong Group adopted an integrated precast solution of UHPC and hydrophobic rock wool, achieving an ultra-low heat transfer coefficient of 0.15W/(m²·K) with panel thickness of only 20mm, reducing weight by more than 60% compared to traditional stone curtain walls. Such solutions achieve reliable anchoring between the insulation layer and structural layer through specialized connectors, and are suitable for high-rise and super high-rise facades.

2. **On-Site Composite Wet-Adhesion Process** For renovation of existing buildings or irregular curved curtain walls, a process of wet-adhering insulation layers to UHPC panels on-site is adopted. In the Nanjing East Road Century Plaza renovation, Qinglong innovatively applied a combination of UHPC translucent concrete and aerogel insulation material, achieving tight bonding of the two through a polymer mortar layer, which not only retains the translucent decorative effect but also meets energy-saving design standards. This process requires strict control of substrate flatness and bonding strength; Qinglong's independently developed interface treatment agent can increase bonding strength to above 1.2MPa.

3. **Cavity-Ventilated Composite System** In humid climate regions, a cavity structure of "UHPC panel + air layer + insulation layer" is adopted, using the air layer to achieve moisture buffering and thermal pressure ventilation. In a commercial complex project in Malaysia, considering the local high-temperature and high-humidity environment, Qinglong designed a composite system of UHPC shading louvers and centrifugal glass wool insulation layer, dissipating heat through air layer convection in summer and reducing heat loss in winter, with an overall energy saving rate of 35%.

**II. Key Technical Points in Engineering Practice**

1. **Material Compatibility Design** Appropriate insulation materials should be selected according to the project's climate zone: rigid polyurethane foam (thermal conductivity ≤0.024W/(m²·K)) is recommended for severe cold regions, while expanded polystyrene boards can be used in temperate regions. Qinglong's technical team, through 2000+ sets of thermal simulation data, established a correlation model between UHPC thickness, insulation layer density, and heat transfer coefficient to ensure design precision.

2. **Joint Waterproofing and Fireproofing Construction** A double-seal design is adopted at insulation layer joints, with butyl rubber strips on the inside and UHPC-specific sealant on the outside (weather resistance ≥20 years). Regarding fire protection, the "UHPC Facade Panels" industry standard, which Qinglong participated in formulating, explicitly requires the insulation layer's combustion performance to reach Class A, with fireproof rock wool isolation belts installed at joints to meet the 90-minute fire resistance limit requirement.

3. **Construction and Installation Precision Control** Relying on BIM technology and 3D scanning positioning, Qinglong achieves UHPC component installation errors of ≤2mm. In a landmark project in Guangzhou, through a "pre-embedded parts + adjustable bracket" system, the coordinated deformation problem of the insulation layer and UHPC panels under wind loads on super high-rise buildings was solved; after 3 years of monitoring, the maximum displacement was only 3.5mm.

**III. Qinglong's Full-Chain Service Empowers Project Implementation**

As a national high-tech enterprise and a UHPC standard formulating unit, Qinglong participates in solution optimization from the detailed design stage: achieving insulation layer segmentation for complex shapes through parametric design software (Rhino+Grasshopper); adopting automated molding processes in production to ensure interface bonding strength between UHPC and insulation layers; and providing "survey-installation-inspection" one-stop services during construction, combined with a 5-year post-maintenance commitment, forming full lifecycle assurance. Currently, Qinglong's UHPC insulation composite system has been applied to 200+ projects domestically and internationally, covering commercial complexes, cultural venues, and municipal engineering, among which the Dongguan Women and Children's Activity Center project won the Silver Award at the first GRC Construction Engineering Innovation Awards.

**Conclusion** The integration technology of UHPC and insulation layers represents a deep fusion of materials science and building technology. With 28 years of professional experience as its foundation, Qinglong Group continuously drives the upgrading of facade systems toward "lightweight, high-performance, and green" through technological innovation and full-chain services. In the future, with the advancement of ultra-low energy consumption building standards, UHPC composite insulation technology will demonstrate its unique value in more landmark projects, providing better solutions for building envelope systems.