Explain the technique and ways of measuring ultrasonic pulse velocity through concrete. Draw sketches.

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Methods of measuring ultrasonic pulse velocity

Direct transmission
Indirect transmission
Surface transmission

Direct transmission- The transmitting and receiving transducers are placed on opposite surfaces of the concrete slab as shown in figure below.

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Indirect transmission: The transmitting and receiving transducers are placed on opposite surfaces of the concrete slab. This will give maximum sensitivity and provide a well-defined path length as shown in figure below.

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Surface transmission: The transmitting and receiving transducers are placed on same or either side of surfaces of the concrete slab as shown in figure below.

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