The purpose of this study is inspection of concrete using impact resonance method and UPV(Ultrasonic Pulse Velocity) method. The frequency polygon of non-destructive testing result shows that non-destructive testing is closely related to compressive strength of concrete.

In this study, analyzed of the correlation UPVand the compressive strength of structural timber. As a result, increased of UPV in accordance with the compressive strength increases. Though more experiments, judgment to be possible to estimate the compressive strength of the structural timber with UPV

The purpose of this study is to more accurately predict the compressive strength of concrete according to mixing proportion using UPV(Ultrasonic Pulse Velocity) method. The equation to predict the compressive strength of concrete is proposed based on the results of UPV method.