What is the term for stressing high strength steel after the concrete has been cast and has achieved sufficient strength?

The correct term for stressing high strength steel after the concrete has been cast and has achieved sufficient strength is post-tensioning. This technique is commonly used in reinforced concrete construction to enhance the structural performance of concrete elements. During post-tensioning, high-strength steel tendons are introduced into the concrete and then tensioned after the concrete has hardened. This process places the concrete in compression, countering tensile forces applied to the structure and thereby increasing its load-carrying capacity and durability.

This method is particularly advantageous as it allows for longer spans and reduces the amount of reinforcement required, leading to more efficient use of materials. By tensioning the cables after the concrete has set, the structure can utilize the superior compressive strength of concrete while managing tensile stresses effectively.

The other terms do not accurately describe this technique: pre-tensioning refers to the process where steel tendons are tensioned before the concrete is cast; resilience and toughness are properties related to materials and their ability to absorb energy or withstand deformation, but they do not specifically relate to the method of stressing steel in concrete.