Narayanan, A and K V L, Subramaniam
(2015)
Damage Assessment in Concrete Structures using PZT patches.
In: 2nd RN Raikar Memorial International Conference & Banthia-Basheer International Symposium on Advances in Science & Technology of Concrete, 18-19 December, 2015, The Lalit, Mumbai.
Abstract
Piezoelectric based PZT smart sensors offer significant
potential for continuously monitoring the development and
progression of internal damage in concrete structures.
PZT-based damage sensors consisting of piezo-electric
patches, which are bonded to the surface of a concrete
structure can be developed for assessing the damage
progression of concrete members. The primary challenge
in developing a PZT-based sensor lies in developing a
methodology to infer about the level of damage in the
material from measurement. Changes in the resonant
behavior in the measured electrical conductance obtained
from electro-mechanical (EM) response of a PZT bonded
to a concrete substrate is investigated for increasing
levels of damage. The sensitivity of EM impedance-
based measurements to level of damage in concrete is
reported. Incipient damage in the form of microcracks in
the concrete substrate produces a change in the electrical
conductance signature associated with the resonant
peaks. Changes in the conductance resonant signature
from EM conductance measurement are detected before
visible signs of cracking. The root mean square deviation
of the conductance signature at resonant peaks is shown
to accurately reflect the level of damage in the substrate.
The findings presented here provide a basis for developing
a sensing methodology using PZT patches for continuous
monitoring of concrete structures.
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