An Electromechanical Impedance Measurement-Based Solution for Monitoring Fresh Concrete Maturity - presented by Dr Guobiao Hu and Professor Daniel Inman

An Electromechanical Impedance Measurement-Based Solution for Monitoring Fresh Concrete Maturity

Dr Guobiao Hu

Dr Guobiao Hu

Associated Journal of Intelligent Material Systems and Structures article

G. Hu et al. (2024) An electromechanical impedance measurement-based solution for monitoring fresh concrete maturity. Journal of Intelligent Material Systems and Structures
Article of record
An Electromechanical Impedance Measurement-Based Solution for Monitoring Fresh Concrete Maturity
Dr Guobiao Hu
Guobiao Hu
Hong Kong University of Science and Technology (Guangzhou)
Chaired by Daniel Inman

This paper proposes an electromechanical impedance measurement (EIM)-based solution for monitoring concrete maturity that refers to concrete strength development at the early stage.

A smart aggregate (SMA) that consists of a waterproofed piezoelectric patch is developed. The working principle is explained based on the impedance theory of an electromechanically coupled system. A finite element (FE) model of the EIM-SMA unit is established. The stiffness of the applied spring foundation is varied to emulate the concrete hardening process.

The simulation results reveal that a peak located between 60 kHz and 70 kHz in the impedance plot could be used as an indication to reflect the stiffness variation of the spring foundation. A 3D-printed mold is designed for rapid production of the EIM-SMA units. In the experiment, two sample EIM-SMA units are used to monitor fresh concrete maturity in the first six hours after casting. The results of the two sample EIM-SMA units agreed well. The experimental results matched the simulation prediction.

Compared to a bar-dropping test that is widely adopted at construction sites, the impedance evolution of an EIM-SMA unit is much smoother and has better monotonicity.

In general, the proposed method has been proven to be a reliable solution to monitor the maturity development of concrete.

References
  • 1.
    G. Hu et al. (2024) An electromechanical impedance measurement-based solution for monitoring fresh concrete maturity. Journal of Intelligent Material Systems and Structures
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G. Hu (2024, May 24), An Electromechanical Impedance Measurement-Based Solution for Monitoring Fresh Concrete Maturity
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