Consideration of the Estimating Method of Crack Depth of Concrete by Ultrasonic Pulse Method
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概要
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In this research, Tc-To method, Delta method and Short distance detour wave method those are the estimation method of crack depth of concrete by ultrasonic pulse method are targeted, formulation background and applicable condition of estimating equation are examined. Moreover, cause with inferior estimation accuracy of crack depth and the best installation position of oscillator and receiver are examined. As a result, the following was clarified. Though ultrasonic pulse velosity of the sound part and the cracked part should become the same from the construction of estimating equation of the crack depth, the ultrasonic pulse velosity of both was actually different. When the detour wave of ultrasonic pulse become right angle, the estimation value of the crack depth close to the true value. And, the conditional equation to decide the best installation position of oscillator and receiver was derived.
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