Nondestructive evaluation of prestressing strands with magnetostrictive sensors

Keith A. Bartels; Chris P. Dynes; Hegeon Kwun

doi:10.1117/12.300103

31 March 1998 Nondestructive evaluation of prestressing strands with magnetostrictive sensors

Keith A. Bartels, Chris P. Dynes, Hegeon Kwun

Proceedings Volume 3400, Structural Materials Technology III: An NDT Conference; (1998) https://doi.org/10.1117/12.300103
Event: Non-Destructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1998, San Antonio, TX, United States

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.

Citation Download Citation

Keith A. Bartels, Chris P. Dynes, and Hegeon Kwun "Nondestructive evaluation of prestressing strands with magnetostrictive sensors", Proc. SPIE 3400, Structural Materials Technology III: An NDT Conference, (31 March 1998); https://doi.org/10.1117/12.300103

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