This research was conducted to know the effect of reinforcement and distance tranducer effective in detecting the depth of concrete cracks. The test specimen used is a 15x15x60 cm3 concrete beam with a concrete quality of 19 MPa. The test material is made of artificial cracks as depth as ± 2cm, ± 4cm, ± 6cm, and any fractured variation made 3 pieces of speciment, in addition to the test object was given a reinforcement of Ø8 mm which is placed horizontally in the center of the beam at a depth of 4 cm from the concrete surface. This testing using indirect method with variations of tranducer distance of 3cm, 6cm, 9cm, and 12cm. The study concluded that the accuracy of UPV testing results was influenced by reinforcement and distance tranducer. Test speciment with an artificial crack depth of ± 2cm and ± 4cm have a greater reading result with a relative error of 36.8% and 16.5%, while the test object with an artificial crack depth of ± 6cm has a smaller reading result with a relative error ± 3.4%. In addition, it obtained an effective tranducer distance of 12cm with an accuracy of 85.4%.
Ultrasonic Pulse Velocity (UPV) test includes a simple Non Destruction Test (NDT) testing method, by utilizing ultrasonic waves. In the implementation of UPV testing with direct, semi-direct, and indirect methods give a quick result of different pulse velocity, with the same quality of concrete. Therefore, this study was conducted to get the correlation and correction value of all three testing methods with PUNDIT Lab+ tool on reinforced concrete. The study used a speciment of concrete beams 15x15x60 cm3 with concrete quality K-275, K-250, K-225 each as much as 3 specimen. The average value of the measurement result with the direct UPV method is 12%, 7% and 5% less than the average value of the semi-direct method of UPV direction vertically, the semi-direct method of the UPV direction horizontally, and the indirect method UPV. Conversion of the measurement results for the direct UPV method of the semi-direct UPV vertical direction, semi-direct UPV direction horizontal and indirect UPV can use the regression equation Vd = 0.2462 Vsd-v + 3192, Vd = 0.1073 Vsd-h + 3923.8 and Vd = 0.0195 Vin + 4341.8.
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