Experimental Study of Crack Depth Measurement of Concrete with Ultrasonic Pulse Velocity (UPV)
Baehaki (a*), Andi Maddeppungeng (a), Yohanes Gilbert Rakian (a)
a) Department of Civil Engineering, University of Sultan Ageng Tirtayasa, Banten, Serang, 42435, Indonesia
*baehaki[at]untirta.ac.id
Abstract
The crack depth measurement of concrete can be conducted by the Ultrasonic Pulse Velocity (UPV) method, but of some measuring results it provides different crack depth results in reinforced concrete testing with the same concrete quality. This raises doubts about the measurement results with UPV. 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 deep as ± 2 cm, ± 4 cm, ± 6 cm, 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 3 cm, 6 cm, 9 cm, and 12 cm. 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 ± 2 cm and ± 4 cm have a greater reading result with a relative error of 36.8% and 15.77%, while the test object with an artificial crack depth of ± 6 cm has a smaller reading result with a relative error ± 4.954%. In addition, it obtained an effective tranducer distance of 120 mm with an accuracy of 85.36%.
Keywords: UPV; PUNDIT; NDT; Crack Depth
Topic: Civil Engineering