Explain the best solution to deal with column block outs when panels need to be cast over them.

• A. Use larger panels to avoid column blocks
• B. Reduce concrete weight
• C. Place sand or gravel with 1-2 inches of topping to cast on
• D. Cast without adjustments

Answer: (C)

When casting tilt‑up panels over column blockouts, you need a stable, level plane for the concrete to pour against so the panel sits flush with the rest of the wall. Filling the blockout with sand or gravel provides a compactable, controllable base that conforms to the column geometry and supports the surface. Then placing 1–2 inches of topping over that fill creates a finished, even plane for the panel to be cast on, ensuring consistent thickness and a smooth, flush face around the column. This method prevents voids and uneven surfaces that could compromise load transfer and panel alignment. Other options don’t offer the same reliable surface for pouring and finishing around the blockout.