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Non-destructive wireless monitoring of early-age concrete strength gain using an innovative electromechanical impedance sensing system

Providakis Konstantinos, Liarakos Evaggelos, E. Kampaniakis

Πλήρης Εγγραφή

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Περίληψη

Monitoring the concrete early-age strength gain at any arbitrary time from a few minutes to a few hours after mixing is crucialfor operations such as removal of frameworks, prestress, or cracking control.This paper presents the development and evaluationof a potential active wireless USB sensing tool that consists of a miniaturized electromechanical impedance measuring chip and areusable piezoelectric transducer appropriately installed in a Teflon-based enclosure tomonitor the concrete strength developmentat early ages and initial hydration states. In this study, the changes of the measured electromechanical impedance signaturesas obtained by using the proposed sensing system during the whole early-age concrete hydration process are experimentallyinvestigated. It is found that the proposed electromechanical impedance (EMI) sensing system associated with a properly definedstatistical indexwhich evaluates the rate of concrete strength development is very sensitive to the strength gain of concrete structuresfrom their earliest stages.

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