What is the maximum aggregate size for tilt-up panels?

• A. 3/4 in to 1 in
• B. 1/2 in to 3/4 in
• C. 3/8 in to 1/2 in
• D. 1 in to 2 in

Answer: (A)

In tilt-up construction, the coarse aggregate size in the concrete mix is limited to ensure the panel can be formed, struck, and finished cleanly. The typical maximum aggregate size allowed for tilt-up panels falls in a range from 3/4 inch up to 1 inch. Using 3/4 inch is common for smooth surface finishes and good consolidation, while up to 1 inch can be used in some mixes where workability and vibration control are well managed. Larger aggregates tend to cause surface imperfections, form-release difficulties, and potential voids, which are undesirable for tilt-up panels. So, 3/4 in to 1 in reflects the practical upper bound used in standard tilt-up practice.