A closure strip in a slab is poured back when infilling after panel erection.

• A. True
• B. False
• C. Not applicable
• D. Depends on panel size

Answer: (A)

In tilt-up construction, gaps around and between the erected panels are closed with a closure strip so that, when the infill concrete is poured back, it bonds to the panel and creates a continuous, monolithic slab. The closure strip acts as a form and bonding surface, allowing the infill to be deposited against it and fill the joint cleanly. Pouring back the closure strip during the infill after panel erection ensures proper load transfer, reduces voids, and accommodates movement between the slab and panels. So this practice is standard and true.