Influence of Embedded Reinforcement in a High Strength Concrete on Ultrasonic Pulse Velocity and Core Test

In this study attempt made to asset the strength of normal and high quality strength concrete with embedded reinforcement bars in two locations and directions using ultrasonic pulse velocity and equivalent core test. Reinforcement bars are always too dense with small spacing in reinforced concrete structures. Any semi or nondestructive test by core test or by ultrasonic pulse velocity has high probability influence by the embedded reinforcement. A study was carried out on 54 cubic models divided to three lines. The first line consists from 18 samples as control specimens which represent the plain concrete for six concrete grades. The other two lines represents the concrete with embedded bar in two different positions. The results indicates the pulse velocity and the core strength test of the normal and high strength concrete with embedded bar is usually higher than in plain concrete of the same grade. The difference became significant when the bar axis in the same direction of the applied pulse or load. While, a negligible affect noticed when, the pulse or the load axis is perpendicular to the bar axis direction.