What Type of Sealant Should Be Used for UHPC Curtain Wall Panel Joints? Analysis of Selection Criteria and Application Techniques

Joint sealing is a key guarantee for the safety and aesthetics of UHPC curtain wall panel systems, and sealant selection must balance material properties, environmental adaptability, and engineering requirements. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain technical expertise to provide professional solutions for designers and owners.

**Core Selection Criteria for UHPC Curtain Wall Panel Sealants** UHPC (Ultra-High Performance Concrete) curtain wall panels feature ultra-high strength and low permeability, and sealants must meet three core requirements: first, **weather resistance** — the ability to withstand long-term UV exposure, temperature variations, and rain erosion; silicone sealants have become the mainstream choice thanks to their excellent aging resistance; second, **adhesion compatibility** — the ability to achieve lasting adhesion with UHPC substrates, metal connectors, and other components, avoiding delamination; third, **movement capability** — considering building settlement and thermal deformation, sealants should have an elastic recovery rate of ±25% or above. During the detailed design stage, Qinglong conducts compatibility testing to ensure the sealant matches the UHPC panels, avoiding engineering risks at the source.

**Analysis of Mainstream Sealant Types and Application Scenarios** In the current market, silicone structural sealants and silicone weatherproof sealants are the main options for UHPC curtain wall joint treatment. Structural sealants are used for load-bearing joints, such as the connection points between panels and keels, and must comply with the "Silicone Structural Sealant for Building" (GB16776) standard; weatherproof sealants are used for non-load-bearing joints, focusing on ensuring water tightness and air tightness. In projects such as the Century Plaza renovation on Nanjing East Road, Qinglong innovatively adopted low-modulus silicone weatherproof sealants to successfully meet the dynamic movement requirements of large-span UHPC curtain walls, and its joint treatment technology for translucent concrete and metal frames won an industry innovation award.

**Construction Key Points and Quality Control** Sealant application must follow the principle of "30% materials, 70% workmanship." Qinglong's construction team has developed a standardized process: first, **substrate pretreatment**, using special solvents to remove oil and dust from the surface of UHPC panel joints; second, **double-sided tape positioning** to ensure a uniform sealant joint width (8-12mm recommended); during application, maintain a continuous and even speed to avoid air bubbles, and use special tools to smooth and finish. For coastal high-humidity environments, Qinglong has also developed a fast-curing sealant application process that shortens curing time by 30%, safeguarding project schedules.

**Full-Chain Service Ensures System Safety** As a national high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong has established a full-process service system covering "material selection - simulation testing - on-site construction - after-sales maintenance." Through BIM technology for joint simulation analysis, combined with an experience database from 2000+ projects, it provides customers with customized sealing solutions. For example, in the Dongguan Women and Children's Activity Center project, the Qinglong team innovatively adopted an "elastic gasket + double sealing" process for the special joints of the GRC and UHPC composite curtain wall, achieving a 15-year zero-leakage record.

From material selection to construction implementation, joint treatment of UHPC curtain wall panels requires professional technical support. Built on 28 years of industry experience, Qinglong Group will continue to drive innovation in UHPC sealing technology, safeguarding the safety and aesthetics of building curtain walls. Choosing a professional supplier is key to ensuring the long-term stable operation of curtain wall systems.