The ductility of concrete is described as its ability to undergo inelastic deformation before failure. It can be linked to toughness (a measure of the energy absorption capacity of the material) and used to characterize the material’s ability to resist fracture. Several studies have proposed nondimensional relative toughness indices (T.I.c) for FRC; these indices, irrespective of concrete strength, depend on the extent of the stress-strain curves obtained.
The toughness index and the toughness of fiber-reinforced concrete (FRC) in compression are related concepts but have distinct meanings:
In summary, while both the toughness index (T.I.c) and the toughness of FRC in compression are related to the material's ability to resist fracture and undergo inelastic deformation, the toughness index provides a normalized, nondimensional measure for comparing different FRC mixes, while the toughness in compression specifically quantifies the energy absorption capacity of FRC under compressive loading conditions.
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