Question

Consider the following statements:
Ultrasonic pulse velocity test is to measure the strength of concrete is
1. used to measure the strength of wet concrete.
2. used to obtain estimate of concrete strength of finished concrete elements.
3. a destructive test.
4. a non-destructive test.
Which of these statement is/are correct?

• A. 2 only
• B. 1 and 3
• C. 2 and 4
• D. 3 and 4

Answer 1

The correct option is C 2 and 4

The non-destructive test may be performed directly on the in-situ concrete without the removal of a sample. These tests do not impair the intended performance of the element or member being tested. They also include methods which cause localized surface zone damaged and may be called partially destructive.
The ultrasonic pulse velocity method is a non-destructive test for hardened concrete which basically involves the measurement of velocity of electronic pulses passing through concrete from a transmitting transducer to a receiving transducer. This method is based on the principle that the velocity of pulse passing through concrete is primarily dependent upon the density and the elastic properties of the materials and is independent of geometry of the component. The density and elastic properties are in turn related to the quality and strength of the material.