Monitoring of Early-Age Characteristics of Concrete using EMI based Embedded PZT Transducers on Varying Plate Thickness

Author(s): Jothi Saravanan T, Gopalakrishnan N and Bharathi Priya C
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 582-591
Total Pages: 10
Language : English

Abstract: Changes in admittance signatures measured using Electro-Mechanical Impedance (EMI) technique with a lead zirconate titanate (PZT) transducer, embedded in concrete is an indirect estimate of the localized changes in dynamic stiffness of the concrete in the proximity of the sensor. Experiments and observations on the EMI signatures obtained from PZT patches bonded onto identical plates of various thickness and embedded in concrete cubes with two sets of differential curing have been presented. Also, experiments are conducted on a concrete beam embedded with six PZT patches bonded on carrier plates of differing thickness by subjecting the beam to differential curing. Frequency shifts for these ultrasonic modes during the initial phase of four to five hours are comparatively less, but substantial damping enhancement is witnessed at this stage. The contribution of the present work is the application of serial/parallel connected sensors embedded in concrete (in a multi input single output, MISO mode), that can be typically deployed in a large scale structural health monitoring (SHM) scenario. Mandatory separation of resonant peaks in the admittance signature is a pre-requisite for tracking and observing the changes, which is achieved through plates of different thickness and hence different ultrasonic resonant (USR) modes.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00