What is a key requirement of formwork design to prevent distortion during concrete placement?

• A. Use light-weight forms only and no bracing.
• B. Rely on experience without alignment checks.
• C. Strong supports, proper bracing, proper release timing, and alignment checks.
• D. Release forms as soon as possible to speed up.

Answer: (C)

The key to preventing distortion in formwork during concrete placement is making sure the form is built to resist the pressures of fresh concrete and stay true to its intended shape. Strong supports hold up the weight and pressure without buckling or sagging. Proper bracing stops panels from moving laterally or collapsing under hydrostatic pressure as the concrete is poured and vibrated. Proper release timing means removing the forms only after the concrete has gained enough strength to support itself, preventing movement or bending as the form is taken away. Alignment checks ensure the forms are plumb, level, and true, so the finished surface and dimensions come out correctly.

Light-weight forms with no bracing won’t withstand the concrete’s pressure, relying on experience without alignment checks risks misalignment, and releasing forms too early can allow distortion before the concrete gains strength.