Why is prestressed concrete used?

Prestressed concrete is utilized primarily to enhance structural performance by enabling longer spans and improving load-carrying capacity. This is achieved through the introduction of internal stresses using high-strength steel tendons, which counteract tensile forces that would otherwise be present when the concrete is subjected to loads. By compressing the concrete, prestressing significantly reduces the likelihood of cracking, allowing for greater structural efficiency.

The capability of prestressed concrete to support larger spans is particularly beneficial in applications such as bridges and large commercial buildings, where traditional reinforced concrete might be inadequate due to its limitations in span-to-load ratios. This technology provides architects and engineers with greater flexibility in design, allowing for more open spaces without the need for numerous support columns, thus optimizing the overall space usage and aesthetic appeal of structures.

In contrast, using prestressed concrete does not primarily serve to expedite the curing process, simplify construction, or limit spans and load capacity. Instead, it fundamentally alters the way concrete behaves under stress, providing advantages that facilitate longer, more efficient structures.