AI Article Synopsis
- This study explored how moisture movement and drying-related shrinkage in concrete can lead to tiny cracks that affect diffuse ultrasound measurements.
- Researchers conducted long-term experiments involving multiple drying and rewetting cycles to track changes in the concrete's mass and ultrasonic properties.
- Findings showed that parameters like diffusivity and dissipation changed significantly during drying and wetting, but did not fully return to original levels when saturated, suggesting that drying can cause micro-cracks that impact ultrasound reliability in changing environments.
Article Abstract
This study aimed to investigate the effects of internal moisture migration and subsequent drying-shrinkage-induced micro-cracking in concrete on diffuse ultrasound, through a series of experiments that comprised multiple drying and rewetting cycles carried out over the long-term. Cyclic drying and wetting phenomena in concrete were physically established following a predefined protocol and were traced measuring the mass change of specimens. Diffuse-wave tests were conducted using a pair of PZT patches bonded to cylindrical specimens, which acted as the ultrasonic transmitter and receiver in the range of 250-550 kHz. The results present that measured diffuse-wave parameters, diffusivity and dissipation, showed distinct varying and cyclic behaviors to drying and wetting processes, but they did not recover their original values in the saturated condition, revealing possible micro-cracking damage caused by the drying process, which should be understood to improve the reliability of diffuse ultrasound measurements in concrete subjected to environmental changes.
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| http://dx.doi.org/10.1016/j.ultras.2024.107529 | DOI Listing |
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