UHPC Curtain Wall Panel Joint Sealant Selection Guide

The choice of sealant for UHPC curtain wall panel joints directly affects waterproofing performance and durability. Qinglong Group recommends silicone sealant as the primary choice, offering movement capability of ≥25% and a service life of over 20 years. Selection must take into account substrate compatibility, construction conditions, and environmental factors.

Silicone sealant delivers the best overall performance. Neutral-cure types are non-corrosive to UHPC and compatible with most coatings. Qinglong Group used two-component silicone sealant in its Shenzhen project, which cures in 24 hours and adapts to various climates. Low-modulus types are better suited to regions with large temperature-induced movement, allowing joint width changes of up to 30% without cracking. Regular inspection and maintenance can extend service life.

Application technique affects sealing performance. Joint cleanliness is critical and requires treatment with specialized cleaners. The backer rod diameter should be 1.2 times the joint width to ensure uniform sealant thickness. Qinglong Group requires an application temperature of 5-40°C and humidity of 40%-80%. A properly trained construction team is the key to success.