Near-Field Microwave Techniques for Detecting Stress-Induced Cracks in Cement-Based Materials
Concrete columns are subjected to minor to medium damage at plastic hinges during an earthquake event. In such a case, it is desirable to determine the residual strength of steel reinforcement that is still covered with cracked concrete. The mapping of surface cracks on the surface of a concrete column may yield useful information for this purpose. Consequently, near-field microwave nondestructive evaluation (NDE) methods are used to detect flexural cracks and evaluate their width, extent, and spatial distribution on columns. This paper presents the viability of using open-ended rectangular waveguide probes for detecting interior and surface cracks in mortar and concrete samples. The results of scanning cylindrical samples possessing simulated interior and surface-breaking cracks using a microwave reflectometer at several microwave frequencies is presented. In addition, the influence of various parameters on crack detection is discussed.
J. Nadakuduti et al., "Near-Field Microwave Techniques for Detecting Stress-Induced Cracks in Cement-Based Materials," Proceedings of the 1st International Conference on Structural Health Monitoring and Intelligent Infrastructure (2003, Tokyo, Japan), vol. 1, pp. 711-718, CRC Press, Nov 2003.
1st International Conference on Structural Health Monitoring and Intelligent Infrastructure (2003: Nov. 13-15, Tokyo, Japan)
Electrical and Computer Engineering
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Cement Based Material; Concrete Column; Concrete Samples; Cracked Concretes; Cylindrical Samples; Earthquake Events; Flexural Cracks; Microwave Reflectometers; Microwave Technique; Near-Field; Non-Destructive Evaluation Methods; Plastic Hinges; Residual Strength; Steel Reinforcements; Stress-Induced; Surface Cracks; Surface-Breaking Crack; Concrete Construction; Damage Detection; Rectangular Waveguides; Surface Defects; Crack Detection
International Standard Book Number (ISBN)
Article - Conference proceedings
© 2003 CRC Press, All rights reserved.
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