Acoustic Density Evaluation Approach for Advanced Ultrasonic Testing of Highly Scattering Materials

Bulavinov, Andrey; ACS-Solutions GmbH; Germany

Bulavinov, A.; ACS-Group; Germany
Pak, K.; Advanced NDT Technology Company Limited; Hong Kong
Pinchuk, R.; ACS-Group; Germany
Samokrutov, A.; ACS-Group; Russia
Schabowicz, K.; Wroclaw University of Science and Technology; Poland
Shevaldykin, V.; ACS-Group; Russia

ID: ECNDT-0519-2018
Session: Civil Infrastructure-Conrete 3
Room: J1
Date: 2018-06-13
Time: 14:10 - 14:30

In view of aging civil infrastructure made of reinforced concrete the demand on intelligent diagnostic tools and quality assurance for integral assessment of infrastructural objects will increase. Ultrasonic material testing in its both functions – flaw detection and mechanical property evaluation – offers one of the possible instrumentation for the quality assurance in construction industry. Due to its unique deep penetrating capability, ultrasonic testing in certain cases remains the only suitable method for evaluating internal structure of large constructions.

For overcoming natural inspectability limitations of coarse grained materials like concrete, a novel method for acoustic evaluation of density gradients – shorty “Acoustic Density” evaluation technique – is proposed. It allows extracting valuable additional information about slight acoustic impedance changes in the material by means of statistical processing of individual wavelets obtained by Dry Point Contact (DPC) transducer arrays and coherent integration of the impedance gradients.

In the current contribution, the basic principles of the new technique are explicated and few application cases are cited showing the potential of the novel approach for variety of practical ultrasonic inspection tasks in the construction industry.