Which technique is often used to remove voids in concrete?

Vibration is the technique commonly used to remove voids in concrete. When concrete is poured, it can contain air pockets or voids that can compromise its strength and durability. By applying vibration to the fresh concrete, these air pockets are encouraged to rise to the surface and escape, which leads to a denser and more uniform mixture. The vibration helps the concrete settle properly in the formwork, ensuring that it fills all spaces and reduces the likelihood of weak spots.

Cooling, mixing, and setting do not directly address the removal of voids in the same manner as vibration. Cooling refers to temperature regulation during the curing process, mixing is the process of combining the constituents of the concrete, and setting involves the hardening process after pouring. While these processes are essential in the overall management of concrete, they do not specifically target the removal of voids as effectively as vibration does.