PROBLEM TO BE SOLVED: To provide a nondestructive inspection method and a nondestructive inspection apparatus for determining a degree of grout filling, which can determine a degree of grout filling with high accuracy in an easy way.;SOLUTION: A nondestructive inspection method for determining a degree of grout filling in prestressed concrete includes the steps of: sending an elastic wave We from a PC surface 100a to a steel sheath 102 and receiving a reflected wave. Under the following condition a, where covering d/sheath diameter r1, frequency-analyzing a range of signals including a reflected wave of maximum amplitude, or under condition b, where covering d/sheath diameter r≥1, frequency-analyzing a range of signals from which the reflected wave of maximum amplitude has been cut by half a waveform; and determining the degree of grout filling according a peak of a frequency that appears on a high-order side of a maximum low-order-side peak, the frequency being a frequency corresponding to the board thickness of the prestressed concrete.;COPYRIGHT: (C)2011,JPO&INPIT
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