Estimation of Crack Depth of the Concrete Specimens using Ultrasonic Propagation Time

When checking about the safety of this concrete structure, the crack of the concrete is the important defect factor. And the method using in order to determine the concrete crack in the first stage is the non-destructive test. The non-destructive test is the method using efficiently in checking the crack of the concrete which is difficult to confirm by the naked eye. This study���s object is utilizing the ultrasonic pulse velocity method and estimates the crack depth of the concrete. In addition, by using the Pundit , this research was progressed. BS method and T method was utilized and the crack depth was estimated. And new method in which applies BS method and T method and it can estimate the crack depth of the concrete tries to be shown.��� ��������� 2011������ ������������������ ��������� ��������� ������ ��������� ���������. ������������ : 2011-000-0000-178