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ABSTRACT
This work presents a study on the comparison between some non-destructive testing techniques (Rebound Hammer and Ultrasonic Pulse Velocity). Tests were performed to compare the accuracy between the rebound hammer and the ultrasonic pulse velocity method in estimating the strength of concrete. Eighty samples (cubes of 150 _ 150 _ 150) were prepared using two mix designs of 1:2:4 and 1:3:6 with a constant w=c ratio of 0.45 and were tested at 7,14,21 and 28 days. The slump test was between 62 {78mm. The results obtained from the non-destructive testing methods were correlated with the compressive strength results which showed that a higher correlation existed between the Rebound Hammer and the compressive strength than the Ultrasonic Pulse Velocity. The rebound hammer readings had a correlation coefficient of 0.794 while the ultrasonic pulse velocity had a correlation coefficient of 0.790 for the 1:2:4 mix and the rebound hammer readings for 1:3:6 was 0.783 and that for the ultrasonic pulse velocity was 0.777. Statistical analysis of the results obtained showed that there was no significant difference between the means of the two methods for both mix at a 0.05 level of significance.
