What Is the Reserved Expansion Joint Width for UHPC Exterior Wall Mouldings? UHPC Expansion Joint Design Specifications

The expansion joint width of UHPC exterior wall profiles is determined by the profile style, local temperature variation, and structural deformation. Generally, the joint width is 10-20mm, with the larger value taken in areas with significant temperature changes. Expansion joint spacing is ≤12m and should be aligned with the main structural joints. Joints are filled with elastic sealant to a depth of ≥1/2 of the joint width.

Expansion joint design requires calculating thermal deformation ΔL=α·L·ΔT, where α=1.0×10⁻⁵/℃ and ΔT is the annual temperature range. For example, for a 6-meter-long profile with an annual temperature range of 40℃, ΔL=2.4mm; considering construction tolerances and other factors, a joint width of 15mm is adopted. In one project, improper expansion joint placement caused the profiles to crack under compression and they had to be replaced. Properly setting expansion joints can prevent such problems.

Joint Width Calculation Principles

ΔL=α·L·ΔT; consider construction tolerances; these principles scientifically determine joint width.

Spacing Requirements

Spacing ≤12m; align with structural joints; these requirements ensure effectiveness.

Sealant Selection

Elastic sealant; movement capability ≥25%; these choices accommodate deformation.

Detailing Key Points

Depth ≥1/2 of joint width; these points ensure sealing.

Expansion joint placement requires calculation. Qinglong UHPC is designed to standard, preventing thermal cracks.