Discussion on Joint Treatment Solutions Between UHPC Exterior Walls and Door-Window Openings and Key Technical Analysis

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become an ideal choice for high-end building facades thanks to its outstanding mechanical properties and design expressiveness. However, the junction between UHPC facades and door/window openings—a critical node affecting a building's overall performance and aesthetics—has long been a technical challenge of concern to designers and contractors. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, has developed a systematic junction solution covering detailed design, material application, and construction techniques, based on the practice of hundreds of landmark projects.

I. Technical Pain Points and Design Logic of UHPC Facade Opening Joints

As weak points of the building envelope, door and window openings must simultaneously meet multiple requirements in their joint treatment, including water tightness, air tightness, wind pressure resistance, and thermal bridge interruption. When facing the high-strength characteristics of UHPC, traditional materials often suffer from cracking and sealing failure caused by differences in thermal expansion and contraction coefficients. Through BIM parametric design, Qinglong's technical team established stress analysis models around the openings, precisely calculated the deformation of UHPC panels and door/window frames, and adopted a composite structure of "flexible connection + rigid support," which ensures structural stability while releasing thermal stress. For example, in the Nanjing East Road Century Plaza renovation project, this design scheme achieved seamless connection between light-transmitting UHPC facades and irregular-shaped doors and windows, winning the AALBORG WHITE Cup UHPC Construction Engineering Innovation Award.

II. Material Synergy: Performance Matching Technology Between UHPC and Matching Components

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise, Qinglong understands the decisive impact of material matching on joint quality. At the detailed design stage, the team selects customized UHPC formulations (flexural strength ≥150MPa) according to the project's climate characteristics, together with self-developed elastic sealant (with 25-year weather resistance) and anti-corrosion hardware. For coastal high-humidity environments, GRC (Glass Fiber Reinforced Concrete) is innovatively used as reinforced frames around openings, leveraging its lightweight and high-strength properties to reduce loads, while GRP (Glass Reinforced Thermosetting Plastic) connectors enable transitions between different materials. This multi-material synergy scheme successfully solved joint failure caused by salt spray corrosion in a seaside hotel project in Malaysia.

III. Construction Techniques: Precision Control from Factory Prefabrication to On-Site Installation

Relying on the 600,000-square-meter annual capacity of its Guangxi production base, Qinglong has established a dual-track construction system of "prefabrication + cast-in-place." In the factory, five-axis machining centers complete fine details such as UHPC opening rabbets and drip lines, with errors controlled within ±0.5mm; on site, 3D laser scanning positioning technology combined with modular installation methods achieves "millimeter-level" assembly precision. In particular, for GRG (Glass Fiber Reinforced Gypsum) interior opening edge treatment, an innovative process combining wet-adhesion and dry-hanging methods ensures the flatness of decorative surfaces while improving installation efficiency by more than 30%. This process system has been incorporated as a reference in the development of the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)."

IV. Full Life-Cycle Management: Closed-Loop Service from Design to Maintenance

Practicing its mission of "Creating Aesthetic Architecture," Qinglong has built a full-chain service covering design consulting, manufacturing, construction and installation, and after-sales maintenance. To address the leakage risks that tend to occur at opening joints, it provides regular inspections (once per quarter in the first year, then once a year thereafter) and digital health monitoring services. By embedding RFID chips to track component performance changes in real time, supported by a professional maintenance team, the long-term safety and stability of buildings is ensured. This full life-cycle management model has won strategic recognition from renowned real estate groups such as Poly and China Overseas, becoming an industry benchmark for UHPC/GRC material applications.

As Vice President Unit of the China GRC Association, Qinglong has always driven industry progress through technological innovation. The junction treatment between UHPC facades and door/window openings is both a comprehensive test of material performance and a concentrated display of design wisdom. Going forward, Qinglong will continue to focus on the UHPC/GRC/GRG/GRP niche segments, leveraging 28 years of professional expertise to provide more valuable solutions for designers and owners, helping to create more architectural works that combine aesthetics with functionality.