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Proceedings Paper

Nondestructive evaluation of prestressing strands with magnetostrictive sensors
Author(s): Keith A. Bartels; Chris P. Dynes; Hegeon Kwun
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Paper Abstract

Magnetostrictive sensors (MsS) provide a noncontact means to transmit and detect elastic waves in a ferromagnetic material. This paper reports results of using MsS for the evaluation of debonding between seven-wire prestressing strands and concrete. Two MsS configurations are described. One uses a coil that encircles the strand, and the other does not. The advantage of the encircling coil is higher sensitivity; the advantage of the other is that it can be operated from the concrete surface and does not necessarily require removal of concrete. The results showed a correlation between signal attenuation and bond quality. The guided wave speed was also found to be inversely proportional to the bond quality.

Paper Details

Date Published: 31 March 1998
PDF: 12 pages
Proc. SPIE 3400, Structural Materials Technology III: An NDT Conference, (31 March 1998); doi: 10.1117/12.300103
Show Author Affiliations
Keith A. Bartels, Southwest Research Institute (United States)
Chris P. Dynes, Southwest Research Institute (United States)
Hegeon Kwun, Southwest Research Institute (United States)

Published in SPIE Proceedings Vol. 3400:
Structural Materials Technology III: An NDT Conference
Ronald D. Medlock; David C. Laffrey, Editor(s)

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