Non-destructive testing (NDT) methods are important alternatives when destructive tests are not feasible to examine the in situ concrete properties without damaging the structure. The rebound hammer test and the ultrasonic pulse velocity test are two popular NDT methods to examine the properties of concrete. The rebound of the hammer depends on the hardness of the test specimen and ultrasonic p...

Two concrete deck slabs extracted from a Canadian bridge have been evaluated using non-destructive testing (NDT), followed by destructive testing. Throughout its service life, the experienced harsh environmental conditions with frequent freeze-thaw cycles, hot and humid summers, use of de-icing salts during winters. This study presents preliminary results an exhaustive condition assessment two ...

The ultrasonic inspection technique can be very useful to determine the state of non reachable structure. In this paper a method based on the neural network classification to evaluate the corrosion level of non accessible pipes is shown. A set of optimal features constitutes the database and feeds the neural network. These features are chosen by time and frequency features extracted from simula...

The modern aircrafts are built using various composite materials such as carbon/glass fibre reinforced plastics, GLARE and honeycombs. Manufacturing technologies of composite materials are complicated and include many stages. Small deviations from the technology parameters may cause relatively small defects, but influence of these defects on a total strength of a construction may be essential. ...

Mycotoxin contamination in certain agricultural systems have been a serious concern for human and animal health. Mycotoxins are toxic substances produced mostly as secondary metabolites by fungi that grow on seeds and feed in the field, or in storage. The food-borne Mycotoxins likely to be of greatest significance for human health in tropical developing countries are Aflatoxins and Fumonisins. ...

Poisson’s ratio has not received much attention because of its narrow range of measured values and difficulties in measurement. In previous work, genuine non-destructive evaluation method of characterizing weld-zone using Poisson’s ratio distribution was proposed. The method was to use immersion ultrasonic testing for measuring longitudinal and transverse wave speeds simultaneously. In present ...

Guided waves have been the attractive ways for the nondestructive inspection of the large structure because of their many advantages. The characteristics of guided waves are presented; some consideration of guided waves in the large structure inspection is stated; excitation methods and their merits and shortcomings are introduced. Several typical applications of guided waves in the large struc...

Damage detection methodology utilizing A-scan and C-scan concept for detecting flaws for composite structure has been presented Ultrasonic bulk wave has been used for non-destructive testing of the composite specimen. Carbon fiber composites have been tested for different types of damages using longitudinal waves. Two sample specimens consisting of a de-lamination, a through hole, and resin ric...

A software package, named ViSFoTA, has been developed for analysing vibration signal using Fourier Transformation and Artificial Neural Network (ANN). The package has been developed primarily for applications in seismology. It can also be used to perform analysis of time series generated by any vibration signals in different frequency bands. The package is therefore equally useful in bio-medica...

This paper presents an approach for measuring the geometry of objects with complex shapes with a 3D camera and, at the same time, collecting surface and subsurface information that is then mapped onto the geometry in good spatial alignment. Subsurface information can be captured with infrared thermography or ultrasonic probes. The approach can thus allow non-destructive testing procedures to be...