What Type of Sealant Should Be Used for UHPC Curtain Wall Panel Joints? Qinglong UHPC Joint Sealing Technical Guide

UHPC curtain wall panel joint treatment should use high-performance silicone sealant with a movement capability of ≥25% and a service life of ≥20 years. Depending on joint width, the sealant thickness should be controlled at 6-12mm, with a width of 1.5-2 times the joint width. This design ensures the sealing performance of joints under temperature changes and wind loads.

In terms of material selection, Qinglong UHPC recommends neutral silicone sealant, which is non-corrosive to UHPC and offers good durability. The joint design adopts double sealing: the first layer uses a foam rod backer, and the second is the sealant body. When applying the sealant, the ambient temperature should be 5-35℃ with humidity ≤80%. In a large public building project, this joint treatment withstood temperature variations from -20℃ to 60℃, with no aging or leakage after 5 years of use.

Sealant Performance Requirements

Movement capability ≥25% to accommodate joint deformation; tensile strength ≥0.5MPa to ensure adhesion; durability ≥20 years, matching the building's lifespan. These requirements ensure long-lasting sealing.

Joint Structural Design

Joint width 10-20mm, depth 8-15mm; foam rod diameter 1.2 times the joint width; sealant thickness ≥6mm. These designs ensure sealing effectiveness.

Construction Process Control

Base surface cleanliness reaching Sa2.5 grade; applying special primer to improve adhesion; construction temperature 5-35℃. These controls ensure quality.

Quality Acceptance Criteria

Sealant surface smooth and bubble-free; firm adhesion without peeling; width deviation ≤1mm. These criteria ensure effectiveness.

Joint sealing requires professional construction. Qinglong UHPC enforces strict process control to guarantee waterproofing performance.