Nondestructive diagnostics of concrete structures is an important and challenging problem. A recent introduction of array ultrasonic dry point contact transducer systems offers opportunities for quantitative assessment of the subsurface condition of concrete structures, including detection of defects and inclusions. The methods described in this paper are developed for signal interpretation of shear wave impulse response time histories from multiple fixed distance transducer pairs in a self-contained ultrasonic linear array. This included generalizing Kirchoff migration-based synthetic aperture focusing technique (SAFT) reconstruction methods to handle the spatially diverse transducer pair locations, creating expanded virtual arrays with associated reconstruction methods, and creating automated reconstruction interpretation methods for reinforcement detection and stochastic flaw detection. Interpretation of the reconstruction techniques developed in this study were validated using the results of laboratory and field forensic studies. Applicability of the developed methods for solving practical engineering problems was demonstrated.
|Original language||English (US)|
|Title of host publication||42nd Annual Review of Progress in Quantitative Nondestructive Evaluation|
|Subtitle of host publication||Incorporating the 6th European-American Workshop on Reliability of NDE|
|Editors||Leonard J. Bond, Dale E. Chimenti|
|Publisher||American Institute of Physics Inc.|
|State||Published - Feb 10 2016|
|Event||42nd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2015, Incorporating the 6th European-American Workshop on Reliability of NDE - Minneapolis, United States|
Duration: Jul 26 2015 → Jul 31 2015
|Name||AIP Conference Proceedings|
|Other||42nd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2015, Incorporating the 6th European-American Workshop on Reliability of NDE|
|Period||7/26/15 → 7/31/15|
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