Post-tensioning is most often used with what type of concrete sections?

Post-tensioning is a method used in the construction of concrete structures to enhance their load-bearing capacity and resistance to cracking. This technique is particularly effective for large, heavy concrete sections because it allows for the creation of longer spans without the need for intermediate supports. By utilizing high-strength steel tendons placed within ducts in the concrete, tension is introduced after the concrete has cured, which compresses the material and helps it withstand tensile forces that would otherwise cause it to crack.

This method is especially advantageous for large concrete elements, such as bridges, parking structures, and elevated slabs, which are subject to significant loads and require high structural integrity. The ability to control deflections and optimize material use makes post-tensioning ideal for these larger structures. Hence, this capability is why the option referring to large, heavy concrete sections is the most appropriate choice in the context of post-tensioning.

Smaller, lightweight sections, thin slabs, and standard blocks do not typically necessitate the same engineering advantages offered by post-tensioning, making them less relevant in this specific scenario.