Effect of Reinforcing Steel on Ultrasonic Waves when Measuring Compressive Strength of the Concrete

In this study, the relationship between the direction of reinforcing steel and the velocity of wave pulses using ultrasound was studied. The first model represents the slab with (50 x 50 x 15) cm dimensions, the number of models was 4, the reinforcing steel distribution in one direction, diameter (12, 16 mm) and spacing (10, 15) cm. The second model is cubes of dimensions (15 × 15 × 15 cm) and their number 20, and measuring pulse speed in concrete models in a vertical and parallel direction with reinforcing steel. In addition, through the results obtained from the test and the rate of readings was two to each model age (7, 28) days respectively. The effect of reinforcing steel more when it was parallel to the direction of the flow of the wave. And, by increasing the diameter of the reinforcing steel, and when the spacing between the bars reduced. The results obtained from the examination were the increase in the readings for 7 days. The direct method, parallel with the reinforcing steel, for the diameter of 12 mm with spacing (10, 15), readers are (6.5%, 5.3%). When the diameter of 16 mm and for 28 days (7.8%, 5.5%), Also (12) mm and distance (10.15), the results (7%, 6.1%), as well as diameter 16 mm (8.1%, 6.3%) compared to the vertical direction