Consider the following statements:
Ultrasonic pulse velocity test 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 statements are correct?1
1, 2 and 3
2
2 and 3
3
2 and 4
4
1 and 3