[1316] CONCRETE DETERIORATION INVESTIGATION BY MECHANICAL IMPEDANCE METHOD
キーワード：concrete deterioration、Deterioration Index.、Energy Loss、fire damage、 routine inspection、mechanical Impedance、Non-destructive testing
The applicability of mechanical impedance method in evaluating the deterioration condition of concrete will improve its reliability. Three different grades of concrete were investigated. Concrete deterioration by fire damage was simulated on all grades of concrete in an electric furnace to an elevated temperatures of 200°C, 400°C, 600°C, 800°C. A deterioration index by impact energy loss on hammering was formulated and proves to be very effective. Irrespective of the grade of concrete, the energy loss deterioration index value is the same for un-deteriorated concrete, and as induced deterioration increases, and later varies slightly with the respective grades of concrete.