Evaluation of Compressive Strength of Concrete by NDT Method by using Rebound Hammer Method, Ultrasonic Pulse Velocity Method and Combine Method (SonReb)

Abstract

The aim of this research was to evaluate the compressive strength of concrete by the non-destructive testing method. The SonReb method was used to establish a correlation between the rebound number and ultrasonic pulse velocity with the compressive strength of concrete. The water-binder ratio of concrete was 0.35 0.45 0.55 0.65 and 0.75. There are concrete curing conditions in water and in air. Test results revealed that when the concrete has a higher water-binder ratio, the compressive strength, rebound number, and pulse velocity are reduced. While concrete cured in water has more compressive strength, rebound number, and pulse velocity than concrete cured in air. It was also found that the rebound number and compressive strength of concrete were linearly correlated. As for the pulse velocity and the compressive strength of the concrete, there is an exponential relationship. While the relationship between the rebound number (Q), ultrasonic pulse velocity (V), and compressive strength of the concrete (f’_c), according to the SonReb method is as equation  with the R² = 0.960.