Location
University of Jinan
Event Website
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Keywords
Freeze-thaw damage; acoustic emission ; mass loss rate; correlation parameter method; concrete
Abstract
Acoustic emission(AE) technology is a dynamic nondestructive testing technology, which is widely used in structural health monitoring and nondestructive testing. In this paper, based on the AE monitoring method, studies the variation laws of mass loss rate, first wave amplitude and AE characteristic parameters of concrete with different freeze-thaw cycles, and analyzes them with the correlation parameter method. The test results show that with the increase of the number of freeze-thaw cycles, the concrete surface spalling is more serious, the mass loss rate increases, and the amplitude of the first wave decreases, indicating that the internal cracks of the concrete are more obvious and the damage is more serious. The amplitude of AE shows obvious periodicity with the number of freeze-thaw cycles, which is mainly due to the combined action of water migration stress and frost heaving force in the specimen. The analysis results of amplitude energy correlation parameters show that the damage degree of concrete under different freeze-thaw cycles is directly proportional to the amplitude and energy of AE. The results of this paper provide a theoretical reference for the study of concrete dynamic damage.
DOI
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Streaming Media
Study on acoustic emission characteristics of concrete freeze-thaw damage
University of Jinan
Acoustic emission(AE) technology is a dynamic nondestructive testing technology, which is widely used in structural health monitoring and nondestructive testing. In this paper, based on the AE monitoring method, studies the variation laws of mass loss rate, first wave amplitude and AE characteristic parameters of concrete with different freeze-thaw cycles, and analyzes them with the correlation parameter method. The test results show that with the increase of the number of freeze-thaw cycles, the concrete surface spalling is more serious, the mass loss rate increases, and the amplitude of the first wave decreases, indicating that the internal cracks of the concrete are more obvious and the damage is more serious. The amplitude of AE shows obvious periodicity with the number of freeze-thaw cycles, which is mainly due to the combined action of water migration stress and frost heaving force in the specimen. The analysis results of amplitude energy correlation parameters show that the damage degree of concrete under different freeze-thaw cycles is directly proportional to the amplitude and energy of AE. The results of this paper provide a theoretical reference for the study of concrete dynamic damage.
https://docs.lib.purdue.edu/icdcs/2022/partiv/8
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