Although impact acoustic measurement is often applied to nondestructive inspection of concrete structures, the evaluation of a structures integrity normally relies purely on the human ear. In order to develop a method that can assess impact sounds quantitatively, the authors have conducted a series of impact acoustic experiments under distinct boundary and material conditions. By using wavelet analysis techniques, it has been shown that this measurement method is capable of assessing concrete structures degrees of deterioration objectively. This paper describes the verification of the impact acoustic method and case studies of its application.