The quantification of the degree of microcracking in concrete after exposure to damage mechanisms are important for the evaluation of concrete structures to determine if the affected element can remain in service, must be repaired, retrofitted, or removed. Current in-place concrete evaluation methods can determine residual mechanical and fluid transportation properties, but none measure the degree of microcracking. A method to determine the crack density parameter (ε) of concrete from changes in the elastic properties of dry and saturated material was developed by Recalde (2009), and applied to concrete disks using resonant methods. This presentation covers the development of the theory and its comparison with direct measurements performed on concrete specimens damaged with high temperatures and compressive loads.
