This paper has carried out an experimental program to establish a relatively accurate relation between the ultrasonic pulse velocity (UPV) and concrete compressive strength. The involved testing cubes of (100) mm prisms (100×100×300) cast with specified test variables. samples are tested by using equipment two methods, direct (DUPV) surface (indirect) (SUPV) for each sample. obtained results we...

− In this paper a new non-destructive testing (NDT) system focusing on micro size superficial defects in metals is presented. The innovative system is composed by a new type of eddy currents probe, electronic devices for signal generation, conditioning and conversion, automated mechanized scanning and analysis software. The key original aspect of this system is the new type of eddy currents pro...

In the construction industry, non-destructive testing (NDT) methods are gaining more popularity for their ability to examine the in-situ component properties without damaging the structure. One of the most common NDTs for measuring the concrete compressive strength on site is the Rebound Hammer Test. Using the rebound value obtained from the test hammer, the concrete compressive strength can be...

Radiographic inspection is a reliable non-destructive test, widely used for integrity evaluation of structures and equipments. Nowadays, high quality images with very accurate resolutions have been supported by modern digital radiographic systems. However, the image analysis for internal defect detection and geometric characterization is still a not totally automated task. The main reason is th...

Abstract The indentation test is a promising technique for the viscoelastic characterisation of asphalt concrete (AC). Indentation measurements are primarily influenced by material properties in direct vicinity indenter-specimen contact point. Accordingly, it may become useful alternative thin layers as well quasi-non-destructive AC field. In this study, spherical used to measure linear mixture...

Non-destructive test methods are often used in tunnel construction to check the required lining thicknesses. Hereby, mostly ground penetrating radar, impact-echo and ultrasonic echo are applied. However, the current knowledge and experience is largely limited to testing the concrete thickness of double-shell tunnels. Problems with the application of non-destructive test methods can arise, when ...