What Is the Reserved Expansion Joint Width for UHPC Exterior Wall Mouldings? Code Requirements and Construction Key Points Explained

Under the dual considerations of architectural aesthetics and structural safety, the expansion joint design of UHPC exterior wall mouldings serves as the building's "breathing channel"—it must not only meet the physical requirements of material properties but also preserve the visual integrity of the building facade. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group leverages its full-chain technical accumulation to provide designers and owners with systematic solutions from code interpretation to construction implementation.

I. UHPC Material Properties Determine Expansion Joint Design Logic

UHPC (Ultra-High Performance Concrete), with its ultra-high strength and excellent durability, has become the ideal choice for modern building skins, but its thermal expansion and contraction coefficient still requires scientifically reserved expansion joints to release stress. According to the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)" (Plan No. 2024-0232T-JC), combined with Qinglong Group's engineering practice data from over a thousand projects, the reserved width of expansion joints for exterior wall mouldings must comprehensively consider three core factors: ambient temperature variation range (typically 5-30mm), component length (sectioning recommended for lengths exceeding 6 meters), and installation method (dry-hanging systems require reserved dynamic adjustment space).

II. Dual Control of Code Requirements and Construction Key Points

At the code level, in addition to following UHPC-specific standards, related codes such as the "Technical Standard for Building Applications of Glass Fibre Reinforced Cement (GRC)" (JGJ/T423-2018) must also be aligned to ensure that expansion joint settings work in coordination with GRC/GRG and other supporting materials. During construction, Qinglong uses BIM technology to simulate temperature field changes and achieves precision control through the "factory prefabrication + on-site fine adjustment" model: joint width error is controlled within ±0.5mm, weather-resistant silicone sealant (Shore hardness 45-50) is selected as the joint filling material, and reinforced anchor fasteners are used at corners and irregular sections, effectively avoiding cracking risks caused by stress concentration.

III. Full-Chain Service Guarantees Project Quality

As a national high-tech enterprise integrating detailed design, production manufacturing, and construction installation, Qinglong Group has established a full lifecycle management system spanning from material formulation optimization to later-stage maintenance. In benchmark projects such as the Nanjing East Road Century Plaza renovation project, modular design integrated expansion joints with light-transmitting UHPC components as a unified whole, meeting 0.1mm-level precision requirements while achieving artistic expression of the building skin. For extreme temperature variation environments in overseas markets, Qinglong Malaysia Building Materials Co., Ltd. also provides customized thermal calculation services to ensure the long-term stability of projects in Southeast Asia, the Middle East, and other regions.

From technical codes to engineering practice, the expansion joint design of UHPC exterior wall mouldings represents a deep integration of materials science and engineering experience. Building on 28 years of professional expertise, Qinglong Group infuses its commitment of "meticulousness and the pursuit of excellence" into every detail, providing reliable technical support for designers to realize their creative visions and creating architectural works for owners that combine aesthetic value with structural safety. Choosing Qinglong means choosing not only premium UHPC products, but also expert-level solutions spanning the entire project lifecycle.