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Title: USE OF THE IMPACT-ECHO METHOD TO EVALUATE DAMAGE DUE TO DISTRIBUTED CRACKING IN CONCRETE PLATE MEMBERS: THEORY AND FIELD TRIALS
Accession Number: 00984636
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: The research evaluated the feasibility of using transient stress waves to detect and quantify cracking caused by distributed damage mechanisms, specifically alkali-silica reactivity and delayed ettringite formation. It was found that distributed damage produced significant and quantifiable changes in the waveforms and spectra obtained from impact-echo results. Numerical (finite element) studies were used to determine how distributed damage in concrete plates affected propagation of impact generated stress waves. To quantify the damage, the rate of stress wave attenuation can be assessed and compared with values predicted by theory. To verify the results obtained in the numerical simulations and to develop correlation between changes in impact-echo signals and the actual amount of damage, impact-echo tests were performed on a specially prepared plate specimen made from concrete modified to produce distributed cracking over time. The actual amount of damage in the plate was determined periodically by using neutron radiography. A correlation between the amount of damage in the samples and changes in impact-echo signals was established. The correlation was verified in field and laboratory studies on concrete sections with distributed damage. The amount of cracking predicted from the analysis of impact-echo tests agreed with the actual amount of cracking obtained from neutron radiography of the core samples. This research demonstrates that the impact-echo method can be used to detect and quantify the amount of distributed damage in concrete plates. However, the mechanism responsible for the damage cannot be ascertained from either impact-echo test results or neutron radiographs.
Supplemental Notes: This paper appears in Transportation Research Record No. 1893, Concrete 2004.
Monograph Title: Monograph Accession #: 00984628
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Kesner, KSansalone, M JPoston, R WPagination: p. 61-69
Publication Date: 2004
Serial: ISBN: 0309094909
Features: Figures
(10)
; Photos
(1)
; References
(13)
; Tables
(3)
TRT Terms: Candidate Terms: Subject Areas: Highways; Materials; I32: Concrete
Files: TRIS, TRB, ATRI
Created Date: Jan 27 2005 12:00AM
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