Panels may be lifted prior to the concrete achieving its design compressive and flexural strength.

• A. True
• B. False
• C. Only with post-t cure
• D. Only with engineer approval

Answer: (B)

In tilt-up work, you don’t lift a panel until the concrete has reached the required strength to carry the lifting and bracing loads. The panel must achieve its design compressive strength so it can support its own weight and any added loads, and it must have enough flexural strength to resist bending and tension during hoisting. Lifting too soon risks cracking, warping, or failure of the panel and can derail alignment and safety. The timing is set by project specifications based on the design strengths, with allowances for engineer-approved exceptions or post-curing only as special cases; the default rule is to wait for the design strength to be reached before lifting.