What is the term for the technique that places prestressing material under tension before pouring concrete?

The term for the technique that involves placing prestressing material under tension before pouring concrete is known as pretensioning. This method is commonly used in precast concrete applications where steel tendons or cables are stretched prior to the concrete being cast. Once the concrete hardens, the tension is released, transferring stress to the concrete and enhancing its load-bearing capacity. This technique is advantageous for creating elements that can resist tensile forces effectively, which is particularly important in areas subject to bending and flexure.

Pretensioning is distinct because it occurs before the concrete is poured, creating a composite material that works efficiently under loads. The careful design and execution of this process lead to improved structural performance, greater spans, and reduced material usage, ultimately resulting in cost savings and increased durability of the concrete element.