Material Requirements and Selection Criteria for Embedded Parts in UHPC Component Installation

In the field of architectural decoration, the outstanding performance of UHPC components depends on a reliable connection system, and as the core hub of these connections, the material selection of embedded parts directly affects the safety and durability of the overall structure. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group provides professional insights for designers and owners from the perspectives of material requirements, selection criteria, and engineering practice.

I. Core Material Requirements for Embedded Parts of UHPC Components

As the "bridge" between UHPC components and the main structure, embedded parts must meet dual standards of mechanical performance and environmental adaptability. First, the strength index of the material is fundamental. Ordinary carbon structural steel Q235B, though lower in cost, is prone to rusting in humid or corrosive environments, affecting long-term stability; whereas low-alloy high-strength structural steel Q355B, with its 355MPa yield strength and good weldability, has become the first choice for most UHPC curtain wall components. For special scenarios such as marine engineering or chemical industry buildings, weathering steel or stainless steel should be used. For example, 316 stainless steel can effectively resist chloride ion attack, and its chromium-nickel alloy composition forms a passivation film, delivering durability 5-8 times higher than ordinary steel.

Beyond strength, the toughness and workability of the material are equally critical. UHPC components often bear dynamic loads, and using brittle materials for embedded parts can easily lead to connection failure. Therefore, elongation must be ≥20% to ensure deformation compatibility. During the detailed design stage, Qinglong Group uses finite element simulation to verify the cooperative load-bearing behavior between the embedded part material and the UHPC matrix, preventing stress concentration caused by stiffness mismatch.

II. Four Key Criteria for Selecting Embedded Parts

1. Engineering Environment Adaptability: Select materials based on the regional climate characteristics of the project. For example, cold northern regions require consideration of low-temperature impact toughness, using Q355ND low-temperature toughness steel at -40℃; for hot and humid southern environments, hot-dip galvanized embedded parts are recommended, with a zinc coating thickness of ≥85μm forming a physical barrier. Qinglong's production base is equipped with salt spray test chambers capable of simulating 5000 hours of marine climate corrosion testing, ensuring embedded parts meet long-term service requirements.

2. Structural Load Compatibility: Calculate the load-bearing capacity of embedded parts based on component self-weight, wind loads, and seismic action, following the "strong joint, weak member" design principle. Take a 10m-high UHPC cladding panel as an example: a single embedded part must withstand a tensile force of about 12kN. In this case, high-strength bolts of M20 or above should be used with Q355B anchor plates, achieving an ultimate tensile capacity of over 45kN and a safety factor of ≥3.

3. Construction Process Compatibility: Embedded parts must match the UHPC casting process. When grouted connections are used for precast components, the material must offer good fluidity and bond strength; for cast-in-place scenarios, the positioning accuracy of embedded parts must be considered. Qinglong combines BIM technology with 3D scanning to control embedded part installation errors within ±2mm, ensuring precise alignment with UHPC components.

4. Whole-Life-Cycle Economy: Avoid focusing solely on initial cost; maintenance expenses should be evaluated comprehensively. A comparison at a landmark project showed that although 304 stainless steel embedded parts increased initial investment by 20%, total costs over a 20-year maintenance-free period were actually reduced by 15%. As a participant in UHPC standard development, Qinglong can provide full-cycle cost analysis for material selection, balancing performance and economy.

III. Industry Practice and Qinglong's Technical Advantages

In the Nanjing East Road Century Plaza renovation project, Qinglong customized a stainless steel embedded parts system for the translucent UHPC curtain wall. By optimizing anchor bar arrangement and UHPC fiber orientation, safe hoisting of oversized 3.6m×1.8m components was achieved. The 316 stainless steel embedded parts used in this project showed no rust after 1000 hours of salt spray testing and won the AALBORG WHITE Cup UHPC Engineering Innovation Award. In addition, the "General Technical Conditions for Ultra-High Performance Concrete Non-Load-Bearing Components" (Plan No. 2024-0232T-JC), which Qinglong helped compile, clarifies the testing standards and selection specifications for embedded part materials, providing technical guidance for the industry.

Material selection for embedded parts is the cornerstone of safe UHPC component application, requiring a balance of mechanical performance, environmental adaptability, and construction needs. With 28 years of full-chain experience, Qinglong Group provides customers with integrated "materials + technology + service" solutions from detailed design to after-sales maintenance. Choose a professional UHPC manufacturer—let every connection become a reliable guarantee of building safety, and together create beautiful architecture.