Material Requirements for Embedded Parts in UHPC Component Installation: Dual Guarantee of Durability and Safety

Embedded parts are the core load-bearing components connecting UHPC components to the main structure, and their material selection directly affects installation safety and long-term durability. With 28 years of full-chain UHPC/GRC/GRG/GRP engineering experience, Qinglong Group has established comprehensive material standards for embedded parts through the practice of thousands of projects. These requirements have been incorporated into the company's technical specifications, with parts of them adopted by the industry standard “Ultra-High Performance Concrete (UHPC) Exterior Wall Panels”.

I. Core Performance Requirements for Embedded Part Materials

The high-strength characteristics of UHPC components (compressive strength ≥150MPa, flexural strength ≥30MPa) impose a triple requirement on embedded parts of “high strength, high corrosion resistance, and high compatibility”. In terms of strength, the tensile strength of embedded parts must be ≥400MPa to ensure they can bear the self-weight of components and external loads (such as wind loads and seismic action); the Q355B section steel embedded parts used by Qinglong achieve a tensile strength of over 470MPa, meeting the installation needs of large components. In terms of corrosion resistance, embedded parts must withstand environmental erosion from the atmosphere, rain, and other elements; in coastal areas in particular, they must be able to resist chloride ion corrosion. Through hot-dip galvanizing (galvanized layer thickness ≥85μm) or the use of stainless steel, Qinglong ensures a service life of embedded parts of ≥50 years. In terms of compatibility, the embedded part material must be compatible with the UHPC hydration process to avoid electrochemical corrosion; Qinglong strictly prohibits ordinary carbon steel from coming into direct contact with UHPC, ensuring an interface bond strength of ≥3.5MPa.

II. Common Embedded Part Material Types and Application Scenario Matching

Hot-dip galvanized carbon structural steel is the mainstream choice for embedded parts of UHPC components, mainly in grades Q235B and Q355B. After hot-dip galvanizing, it offers moderate cost and good corrosion resistance, making it suitable for most building scenarios. For example, in the Shenzhen Yirui Biotechnology Building project, Qinglong used Q355B hot-dip galvanized embedded parts to successfully carry the installation loads of a 3000㎡ UHPC curtain wall. Stainless steel (SUS304, SUS316) offers superior corrosion resistance and is especially suitable for coastal and high-humidity environments; in the Hainan International Convention and Exhibition Center project, Qinglong adopted SUS316 stainless steel embedded parts, effectively resisting corrosion from the marine climate. For heavy-load components (single piece weight ≥1 ton), Qinglong uses alloy structural steel (No. 45 steel) embedded parts; after quenching and tempering, their yield strength reaches ≥355MPa, meeting the installation requirements of the 12㎡ super-large UHPC components in the Shanghai New World project.

III. Key Quality Control Points for Embedded Part Materials

Material selection must be matched to the project environment. Qinglong conducts environmental assessments in the early stage of each project, giving priority to SUS316 stainless steel for coastal areas, while hot-dip galvanized Q355B steel can be selected for dry inland areas. In terms of material testing, Qinglong strictly implements a “double inspection system”: raw materials must be accompanied by material certificates, and after arriving on site, samples are tested for tensile strength, corrosion resistance, and other indicators; non-conforming materials are strictly prohibited from use. The bonding process between embedded parts and UHPC is also crucial. Qinglong adopts “mechanical anchoring + interface treatment” technology, setting anti-slip teeth and anchoring bars on the surface of embedded parts while applying an interface treatment agent, which increases the bond strength between embedded parts and UHPC by 20%, ensuring a secure connection.

IV. Qinglong's Technological Innovation and Standard Leadership in Embedded Part Materials

As a national “Specialized, Refined, Distinctive, and Innovative” enterprise, Qinglong Group holds 58 related patents. Among them, the patented technology “A Corrosion-Resistant Embedded Part Specially Used for UHPC Components” employs composite coating treatment (hot-dip galvanizing + epoxy resin coating) to increase corrosion resistance by more than three times. When participating in the formulation of the industry standard “General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components”, the embedded part material requirements proposed by Qinglong (such as the nickel-chromium content standard for stainless steel and the hot-dip galvanized layer thickness requirement) were incorporated into the standard's provisions. Supported by a strict quality control system, Qinglong's embedded parts have been applied in thousands of projects nationwide without a single safety hazard caused by material issues, earning high recognition from renowned real estate groups such as Poly, China Overseas, and Vanke.

The selection of embedded part materials is the fundamental guarantee for the safe installation of UHPC components. Qinglong Group always maintains a “meticulous and excellence-driven” attitude, exercising full control from material selection and production processing to installation inspection. As an industry-leading UHPC/GRC/GRG/GRP supplier, Qinglong will continue to deepen its technological R&D, providing customers with embedded part solutions that combine safety and durability, and contributing to the creation of high-quality construction projects.