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Proceedings Paper

Monitoring general corrosion of rebar embedded in mortar using high-frequency guided mechanical waves
Author(s): Benjamin L. Ervin; Jennifer T. Bernhard; Daniel A. Kuchma; Henrique Reis
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Paper Abstract

High-frequency guided mechanical waves were used to ultrasonically monitor reinforced mortar specimens undergoing accelerated general corrosion damage. Waves were invoked, using both single-cycle and high-cycle tonebursts, at frequencies where the attenuation is at a local minimum. Results show that the high-frequency waves were sensitive to irregularities in the reinforcing rebar profile caused by corrosion. The sensitivity is thought to be due to scattering, reflections, and mode conversion at the irregularities. Certain frequencies show promise for being insensitive to the surrounding mortar, ingress of water, presence of additional rebar, stirrups, and rust product accumulation. This lack of sensitivity allows for changes in guided wave behavior from bar profile deterioration to be isolated from the effects of other surrounding interfaces.

Paper Details

Date Published: 10 April 2007
PDF: 12 pages
Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 65291B (10 April 2007); doi: 10.1117/12.714180
Show Author Affiliations
Benjamin L. Ervin, Univ. of Illinois at Urbana-Champaign (United States)
Jennifer T. Bernhard, Univ. of Illinois at Urbana-Champaign (United States)
Daniel A. Kuchma, Univ. of Illinois at Urbana-Champaign (United States)
Henrique Reis, Univ. of Illinois at Urbana-Champaign (United States)


Published in SPIE Proceedings Vol. 6529:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007
Masayoshi Tomizuka; Chung-Bang Yun; Victor Giurgiutiu, Editor(s)

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