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ACOUSTIC EMISSIONS TESTING OF PRESTRESSED CONCRETE IN AN ACCELERATED STATE OF CORROSION
Title
ACOUSTIC EMISSIONS TESTING OF PRESTRESSED CONCRETE IN AN ACCELERATED STATE OF CORROSION.
Creator
BABAKANIAN, RUBIK., Florida Atlantic University, Dunn, Stanley E.
Abstract/Description
The acoustic emission (AE) testing reported herein was conducted on a large size prestressed concrete slab placed in contact with sea water in a state of electrically induced accelerated corrosion. AE signals were monitored and successfully analyzed in an attempt to evaluate the severity of the deformation process in the concrete as a result of the corrosion induced cracking. Several features of the AE data which were sensitive to the process were plotted to show the different levels of the...
Show moreThe acoustic emission (AE) testing reported herein was conducted on a large size prestressed concrete slab placed in contact with sea water in a state of electrically induced accelerated corrosion. AE signals were monitored and successfully analyzed in an attempt to evaluate the severity of the deformation process in the concrete as a result of the corrosion induced cracking. Several features of the AE data which were sensitive to the process were plotted to show the different levels of the cracking due to the corrosion. These were amplitude, counts and energy distributions, and event distribution with time. A location test was employed to find the source of the activities. The results of the amplitude distributions were found to have similar characteristics to those obtained from the reinforced concrete AE experiments performed at Florida Atlantic University (1,2). These tests can be easily applied to a field location for an early detection of the deformation process in the concrete structures.
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Date Issued
1984
PURL
http://purl.flvc.org/fcla/dt/14230
Subject Headings
Prestressed concrete, Acoustic emission testing
Format
Document (PDF)
ACOUSTIC EMISSION ASSOCIATED WITH EMBEDDED METAL CORROSION IN A CONCRETE SLAB
Title
ACOUSTIC EMISSION ASSOCIATED WITH EMBEDDED METAL CORROSION IN A CONCRETE SLAB.
Creator
MARSHALL, RICHARD MELBOURNE., Florida Atlantic University, Dunn, Stanley E., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Measured values of attenuation with distance, amplitude distribution, and propagation velocity of acoustic emissions associated with embedded metcil corrosion induced cracking in a concrete slab are presented. An extensive review of acoustic emission signal processing techniques and theoretical background material is also included. The study points out how attenuation and propagation velocity of the acoustic emission signal affects various signal processing techniques and verifies an...
Show moreMeasured values of attenuation with distance, amplitude distribution, and propagation velocity of acoustic emissions associated with embedded metcil corrosion induced cracking in a concrete slab are presented. An extensive review of acoustic emission signal processing techniques and theoretical background material is also included. The study points out how attenuation and propagation velocity of the acoustic emission signal affects various signal processing techniques and verifies an amplitude distribution spreading rrodel. The need for further defirlition of attentuation values caused by fluid loading of the concrete surface is also discussed.
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Date Issued
1982
PURL
http://purl.flvc.org/fcla/dt/14129
Subject Headings
Reinforced concrete--Corrosion, Acoustic emission testing
Format
Document (PDF)
DETECTION OF DETERIORATION OF REINFORCED CONCRETE BY ACOUSTIC EMISSION TECHNIQUES
Title
DETECTION OF DETERIORATION OF REINFORCED CONCRETE BY ACOUSTIC EMISSION TECHNIQUES.
Creator
WENG, MING-YUAN., Florida Atlantic University, Dunn, Stanley E., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
In this investigation acoustic emission techniques were employed to detect deterioration of reinforced concrete. As a result of various laboratory tests, acoustic emission activity was found to be due to development of cracking only. Acoustic emission techniques were able to locate cracks in a specimen by linear location. Various acoustic emission parameters such as amplitude, signal shape and frequency were also analyzed and discussed. It was concluded that acoustic emission techniques...
Show moreIn this investigation acoustic emission techniques were employed to detect deterioration of reinforced concrete. As a result of various laboratory tests, acoustic emission activity was found to be due to development of cracking only. Acoustic emission techniques were able to locate cracks in a specimen by linear location. Various acoustic emission parameters such as amplitude, signal shape and frequency were also analyzed and discussed. It was concluded that acoustic emission techniques provided a feasible method for detection of deterioration and cracking of steel reinforced structures in laboratory studies as well as in a field environment.
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Date Issued
1980
PURL
http://purl.flvc.org/fcla/dt/14042
Subject Headings
Acoustic emission testing, Reinforced concrete--Corrosion
Format
Document (PDF)
Acoustic emission investigation of marine corrosion-induced and external load-induced cracking of concrete
Title
Acoustic emission investigation of marine corrosion-induced and external load-induced cracking of concrete.
Creator
Sailappan, R. N., Florida Atlantic University, Reddy, Dronnadula V., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
The acoustic emission investigations reported herein are divided into two experimental sets. In the first, the concrete specimens were stressed internally, and the resulting acoustic emissions were monitored. In the second, specimens were subjected to fracture mechanics tests and simultaneously studied for AE signals. For both sets, two kinds of concrete were studied--regular concrete and concrete containing fly ash. The specimens were stressed internally by subjecting them to an accelerated...
Show moreThe acoustic emission investigations reported herein are divided into two experimental sets. In the first, the concrete specimens were stressed internally, and the resulting acoustic emissions were monitored. In the second, specimens were subjected to fracture mechanics tests and simultaneously studied for AE signals. For both sets, two kinds of concrete were studied--regular concrete and concrete containing fly ash. The specimens were stressed internally by subjecting them to an accelerated state of corrosion in a marine environment. The corroded specimens were then tested for impact and flexural strengths to study the effect of fly ash replacement on rebar corrosion in a marine environment, and to ascertain any correlation between the monitored AE signals and residual strength. Furthermore, an attempt was made to predict the remaining life of the specimens. For the externally stressed specimens, AE was used to determine the load at initiation of unstable crack propagation terms of ultimate load. These tests have immediate and relevant applications to field problems.
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Date Issued
1991
PURL
http://purl.flvc.org/fcla/dt/14700
Subject Headings
Acoustic emission testing, Concrete--Corrosion, Concrete--Cracking
Format
Document (PDF)
ACOUSTIC EMISSIONS TESTING AS A NONDESTRUCTIVE MONITOR OF CONCRETE CRACKING DUE TO REINFORCING BAR CORROSION
Title
ACOUSTIC EMISSIONS TESTING AS A NONDESTRUCTIVE MONITOR OF CONCRETE CRACKING DUE TO REINFORCING BAR CORROSION.
Creator
YOUNG, JAMES DANIEL., Florida Atlantic University, Dunn, Stanley E., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Steel reinforced concrete specimens of loaded and unloaded configuration were placed in contact with seawater in a state of accelerated corrosion. They were simultaneously monitored for acoustic emission and the results were analyzed in an evaluation of the use of acoustic emission as a nondestructive monitor of corrosion induced cracking. It was shown that, in a laboratory environment, counts and amplitude information are sensitive indicators of the levels of cracking within the concrete...
Show moreSteel reinforced concrete specimens of loaded and unloaded configuration were placed in contact with seawater in a state of accelerated corrosion. They were simultaneously monitored for acoustic emission and the results were analyzed in an evaluation of the use of acoustic emission as a nondestructive monitor of corrosion induced cracking. It was shown that, in a laboratory environment, counts and amplitude information are sensitive indicators of the levels of cracking within the concrete specimen; and thereby the degree of corrosion damage may be inferred. Analytical models applicable to the representation of acoustic emission amplitude distribution are discussed also.
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Date Issued
1982
PURL
http://purl.flvc.org/fcla/dt/14141
Subject Headings
Reinforced concrete--Cracking, Reinforced concrete--Corrosion, Acoustic emission testing
Format
Document (PDF)