What is toughness index of concrete?

The toughness index of concrete is a measure of its ability to absorb energy and deform without failing, reflecting its ductility and resistance to crack propagation. It is calculated by comparing the area under the load-deformation curve of a concrete specimen during a fracture test. A higher toughness index indicates better performance under impact or dynamic loading conditions, making the concrete more suitable for applications where durability and resilience are critical. This property is essential for structures subjected to varying loads and environmental conditions.