Connection Treatment Solutions for UHPC Exterior Walls and Door/Window Openings: Analysis of Key Technical Points and Implementation Strategies

The refinement of a building's envelope often lies in millimeter-level details, and the connection between UHPC exterior walls and door/window openings is a critical junction that determines building quality. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has always believed that a scientific connection solution concerns not only the integrity of architectural aesthetics, but is also a core element in ensuring structural safety and stable performance.

**Technical Pain Points and Industry Challenges in UHPC Exterior Wall Opening Connections** UHPC (Ultra-High Performance Concrete), with its ultra-high strength, excellent durability, and design freedom, has become the preferred material for high-end building exterior walls. However, door and window openings, as weak areas of the wall structure, face three core challenges in their connection with UHPC panels: first, the risk of cracking caused by differences in thermal expansion coefficients between materials; second, ensuring the long-term effectiveness of waterproof sealing; and third, the difficulty of precisely fitting irregularly shaped openings. A landmark project once suffered problems such as water seepage at joints and peeling of the finish layer due to defects in traditional connection techniques, directly affecting the building's service life and appearance.

**Full-Chain Solution: A Technical Closed Loop from Design to Construction** Based on its full-chain advantages of "detailed design – manufacturing – construction and installation – after-sales maintenance," Qinglong Group has built a systematic connection treatment system. In the detailed design stage, BIM technology is used for parametric modeling to precisely calculate stress distribution around the openings, and rigid connections between embedded steel frames and UHPC panels achieve uniform load transfer. In the production stage, a self-developed UHPC-specific interface treatment agent is applied to enhance the bond strength between panels and sealing materials, with shear performance 30% higher than the industry standard. During construction and installation, an innovative "dry-wet separation" double-sealing process is adopted: the inner structural sealant ensures water tightness, while the outer weather-resistant sealant absorbs thermal deformation. Together with Qinglong's patented adjustable anchoring system, this achieves installation precision control of ±3mm.

**Key Implementation Strategies and Quality Control Points** Qinglong Group provides customized implementation strategies for different building scenarios: for high-rise residential projects, the focus is on optimizing the design of reinforcing ribs around openings, using UHPC and GRC composite construction to reduce self-weight; large-span openings in commercial complexes use GRP connectors for flexible transitions to effectively relieve thermal stress. In terms of quality control, a "three-inspection system" has been established — raw materials entering the factory must pass 300 freeze-thaw cycle tests, RFID chip traceability is implemented during production, and on-site installation is accepted via 3D laser scanning, ensuring that every connection node complies with the standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)."

From the curved UHPC curtain wall of a cultural center in Guangzhou to the irregular opening treatment in the Nanning metro project, Qinglong Group has proven through 28 years of technical expertise that a high-quality connection solution is the key to maximizing the value of UHPC exterior wall systems. Going forward, Qinglong will continue its mission of "creating beautiful architecture," providing designers and owners with more forward-looking building envelope solutions through material innovation and process upgrades, and promoting the in-depth application of UHPC/GRC/GRG/GRP materials in the field of architectural decoration.