How to Mitigate UHPC Autogenous Shrinkage Through Material Design: Research on Mechanism Analysis and Optimization Strategies

The durability of a building curtain wall is not only about aesthetics, but also directly affects building safety and service life. In the treatment of connection joints between GRC curtain walls and steel structures, anti-rust technology and quality control are key factors determining project success. As an industry expert with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group has developed a systematic anti-rust solution through full-chain technical accumulation, providing reliable protection for more than a thousand landmark projects.

Corrosion Risks and Protection Logic of GRC Curtain Wall-to-Steel Structure Connections

GRC curtain walls, with their advantages of light weight, high strength and flexible shaping, are widely used in high-end buildings such as grand theaters and commercial complexes. However, under environmental factors such as humidity and temperature variations, metal connectors are prone to electrochemical corrosion, leading to connection joint failure. Based on the requirements of the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), the Qinglong team has established a three-dimensional protection system of "material matching + multi-layer protection + long-term monitoring" to eliminate corrosion risks at the source.

Full-Process Anti-Rust Treatment Technology and Key Techniques

At the material selection stage, Qinglong uses hot-dip galvanized steel combined with stainless steel fasteners, verified by salt spray testing to achieve an anti-rust service life of over 15 years. For projects in coastal high-humidity, high-salinity environments, it has innovatively introduced zinc-aluminum alloy coating technology, improving corrosion resistance by 30% compared with traditional processes. In connection joint design, BIM technology is used to simulate stress distribution, and flexible anti-corrosion gaskets are adopted to avoid electrochemical corrosion caused by contact between dissimilar metals. This technology has been successfully applied in the Nanjing East Road Century Plaza renovation project.

In the production and manufacturing stage, Qinglong has established an automated sandblasting and rust-removal production line to ensure steel surface treatment reaches the Sa2.5 standard, while strictly controlling coating thickness within the 80-120μm range. During on-site installation, special anti-corrosion sealant is used for joint waterproofing, forming a triple barrier of "metal plating + anti-corrosion coating + sealed protection." Notably, Qinglong's proprietary RFID chip traceability system records the production batch and installation information of each connector in real time, providing data support for later maintenance.

Quality Control System and Industry Standard Practices

As a participant in formulating the industry standard General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components, Qinglong integrates quality control throughout the entire process of design, production and construction. Its laboratory is equipped with salt spray test chambers, electrochemical workstations and other professional equipment to quantitatively test the effectiveness of anti-rust treatment; a "three-inspection system" is implemented on construction sites, focusing on verifying coating integrity, joint sealing and anti-corrosion material compatibility. This rigorous approach has enabled projects undertaken by Qinglong, such as the Dongguan Women and Children's Activity Center, to maintain a zero-corrosion record at connection joints after 10 years of exposure to the elements.

Anti-rust treatment is the invisible cornerstone of GRC curtain wall engineering, requiring both innovative breakthroughs in materials science and meticulous engineering management. With the technical strength of its national-level R&D center and 28 years of engineering practice, Qinglong Group is driving the upgrade of GRC curtain wall anti-rust technology toward systematization and intelligence. In the future, as UHPC/GRC composite structure technology develops, long-term protection of connection joints will become a core guarantee of building safety. Qinglong will continue to uphold its philosophy of "meticulousness and the pursuit of excellence" to safeguard architectural aesthetics and structural safety.