Evaluation of freeze–thaw damage in concrete by ultrasonic imaging
| Autor: | J.J. Anaya, Margarita Hernández, Ghaida Al‐Assadi, M. Molero, M.J. Casati, S. Aparicio |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Attenuation 0211 other engineering and technologies 02 engineering and technology Structural engineering 021001 nanoscience & nanotechnology Condensed Matter Physics Ingeniería Civil y de la Construcción Ultrasonic imaging Ultrasonic velocity 021105 building & construction General Materials Science Ultrasonic sensor 0210 nano-technology business |
| Zdroj: | NDT&E International, ISSN 0963-8695, 2012-11, Vol. 52 Archivo Digital UPM Universidad Politécnica de Madrid |
| ISSN: | 0963-8695 |
| DOI: | 10.1016/j.ndteint.2012.05.004 |
| Popis: | This work studies the use of ultrasonic imaging as an evaluation tool in concrete subjected to freeze–thaw (F–T) cycles. To evaluate the damage in this deterioration process, ultrasonic velocity and attenuation images have been generated from concrete specimens with and without air-entraining agents. Two parameters have been proposed from these ultrasonic images according to our experimental setup: the non-assessable area proportion (NAAP) and a weighted average velocity in terms of the NAAP. The proposed parameters have been compared with the recommended failure criteria of the ASTM and Rilem standards, which employ ultrasonic contact measurements. The principal advantage of the use of ultrasonic images and the proposed methodology in comparison with the ultrasonic velocity measurements by contact is the possibility of detection of incipient damage caused by accelerated freeze–thaw cycles. |
| Databáze: | OpenAIRE |
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