UHPC Curtain Wall Panel Joint Sealant Selection Guide: Qinglong's 28 Years of Application Experience

Joint sealing is key to the waterproofing, moisture resistance, thermal insulation, and energy efficiency of UHPC curtain walls, and sealant selection directly affects the curtain wall's service life and performance. Through 28 years of UHPC/GRC/GRG/GRP engineering practice, Qinglong Group has accumulated extensive sealant selection experience for various scenarios, providing scientifically reliable solutions for projects.

I. Core Performance Requirements for Sealants on UHPC Curtain Wall Panels Sealants for UHPC curtain wall panel joints must meet three core requirements: strong adhesion, excellent weather resistance, and suitable elasticity. UHPC has a dense, smooth surface, so the sealant must bond firmly to it without peeling; it must also withstand UV radiation, high-low temperature cycling, and rain erosion, with a service life of no less than 15 years. In addition, to account for building settlement and thermal deformation, the sealant must have an elongation rate of 15%-25% to prevent joint cracking.

II. Sealant Types Suitable for UHPC Curtain Walls and Their Application Scenarios Currently, mainstream compatible sealants fall into three categories: silicone sealants, polyurethane sealants, and MS sealants. Silicone sealants offer the best weather resistance and are suitable for coastal areas with high salt mist and strong UV exposure. In the Hainan International Convention and Exhibition Center project, Qinglong used neutral silicone sealant, which still maintains good sealing performance after 10 years of use. Polyurethane sealants have strong adhesion and good elasticity, making them suitable for inland areas with large temperature differences; they were widely applied in the Shenzhen Pingshan High-tech Zone Comprehensive Service Center project. MS sealants are environmentally friendly with low pollution, suitable for indoor or low-corrosion environments, such as the UHPC interior decorative joints at Nanning Wuxiang China Resources MixC.

III. Qinglong's Engineering Practice and Standards in Sealant Selection As an enterprise that participated in developing the standard for Ultra-High Performance Concrete (UHPC) Exterior Wall Panels, Qinglong has established a rigorous sealant selection process. First, preliminary screening is conducted based on the project's regional climate, application scenario (indoor/outdoor), and performance requirements; then compatibility is verified through laboratory adhesion tests and aging tests. In the renovation project of Shanghai New World Nanjing Road Century Plaza, modified silicone sealant was custom-selected to meet the special joint requirements of UHPC faux-wood translucent panels, ensuring sealing performance without affecting light transmission. In addition, Qinglong emphasizes the compatibility between sealants and UHPC panels to prevent material aging caused by chemical reactions.

Selecting sealants for UHPC curtain wall panel joints requires balancing performance, application scenario, and compatibility—blind selection is not advisable. With 28 years of engineering experience and a professional technical team, Qinglong Group provides precise selection recommendations for each project, preventing leakage risks at the source. Choosing a matched sealant combined with standardized installation is an important guarantee for the long-term stable operation of UHPC curtain walls.