The true statement about tilt-up panel construction.

• A. The 28-day strength is 3000 psi
• B. The typical 28-day compressive strength for panels is 5000 psi and the lift strength prior to erection is 2500 psi
• C. The lift strength is 3500 psi
• D. The 28-day strength is 4500 psi and lift is 1800 psi

Answer: (B)

In tilt-up construction, panels are cast horizontally and cured to a relatively high 28-day compressive strength to handle the panel’s weight and later loads, typically around 5,000 psi. The lift strength used before erection is a separate, lower value tied to the lifting hardware and anchors, commonly about 2,500 psi, since the lift is a temporary, controlled load and relies on the lifting inserts rather than the full panel strength. This combination—about 5,000 psi for 28-day strength and about 2,500 psi for lift strength—reflects standard practice, which is why the statement with those figures is correct. The other options propose different 28-day strengths or lift strengths that don’t align with typical tilt-up design values, so they aren’t the true statement.