Fabrication of a Piezoelectric Impact Hammer and Its Application to the In-situ Nondestructive Evaluation of Concrete
Resource
Jpn. J. Appl. Phys. 41(2002), 6595–6600
Journal
Jpn. J. Appl. Phys. 41(2002), 6595–6600
Pages
-
Date Issued
2002
Date
2002
Author(s)
TONG, J.-H.
WU, T.-T.
LEE, C.-K.
DOI
246246/200611150121952
Abstract
In this paper, a piezoelectric impact hammer is designed and fabricated for generating stable repeated impact elastic waves
and further for in-situ wave velocity measurements of concrete specimens. The piezoelectric impact hammer consists of a
stacked multilayer PZT, a flying head system with an on-line load cell embedded and a holding fixture. To measure the
longitudinal or Rayleigh waves of a concrete specimen, two horizontally polarized conical transducers are utilized to receive
the elastic waves generated by the piezoelectric impact hammer. Due to the stable impact generation of the piezoelectric
impact hammer, the experimental results showed that the accuracy of the wave velocity measurement was enhanced
significantly through the signal averaging. Since the impact time origin of the newly designed impact hammer can be
determined accurately, it was utilized to measure the depth of a normal surface-breaking crack in a concrete specimen, and the
result is very accurate. We note that the results of this study offer a precise and convenient way of measuring in-situ elastic
properties and/or crack depth of concrete specimens.
Subjects
piezoelectric material
impact hammer
concrete
elastic wave
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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