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Test system for defect detection in cementitious material with artificial neural network

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Author(s): Saowanee Saechai | Phatra Kusalanggoorawat | Waree Kongprawechnon | Raktipong Sahamitmongkol

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 35;
Issue: 2;
Start page: 217;
Date: 2013;
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Keywords: ultrasonic waves | ultrasonic pulse velocity | defect detection | neural network | pattern recognition

ABSTRACT
This paper introduces a newly developed test system for defect detection, classification of number of defects andidentification of defect materials in cement-based products. With the system, the pattern of ultrasonic waves for each case ofspecimen can be obtained from direct and indirect measurements. The machine learning algorithm called artificial neuralnetwork classifier with back-propagation model is employed for classification and verification of the wave patterns obtainedfrom different specimens. By applying the system, the presence or absence of a defect in mortar can be identified. Moreover,the system is applied to identify the number and materials of defects inside the mortar. The methodology is explained and theclassification results are discussed. The effectiveness of the developed test system is evaluated. Comparison of the classification results between different input features with different number of training sets is demonstrated. The results show that thistechnique based on pattern recognition has a potential for practical inspection of concrete structures.
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