Smart Structures and Systems

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Performance of cement composite embeddable sensors for strain-based health monitoring of in-service structures

  • Rao, Rajani Kant (Academy of Scientific and Innovative Research (AcSIR)) ;
  • Sindu, B.S. (Special and Multifunctional Structures Laboratory, CSIR-Structural Engineering Research Centre) ;
  • Sasmal, Saptarshi (Academy of Scientific and Innovative Research (AcSIR))
  • Received : 2020.02.08
  • Accepted : 2021.05.29
  • Published : 2021.08.25
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Abstract

There is a growing need to develop sensors which can be embedded into the structures during the construction stage itself for developing smart structures. It is preferred to develop these kinds of sensors with the material same as that of material used in construction for the sake of compatibility and better capturing the actual state of distress in the structure. Towards this, in this study cement based piezo-resistive sensors are developed with the help of conductive nano-fillers (Carbon Nanotubes (CNTs)). Since the sensors are cement based, and porous in nature, the characteristics of the sensor will vary due to water penetration into the sensor. As the structures with such embedded sensors have to perform for years, understanding the variations in the characteristics of the sensor due to pore structure is very important. In this regard, the conductivity of the sensor is assessed where the effect of dosage of CNTs, functionalization of CNTs, type of electrical conductivity measurement (both DC and AC) and pore water are the parameters. The strain sensitivity of the sensors under cyclic stress is also investigated and reported in the present study. The findings of this study will help in developing continuous health monitoring strategies using highly sensitive embeddable cement-based nanocomposites.

Keywords

Acknowledgement

The contribution from the staff members of SMSL of CSIR-SERC during preparation of specimens and carrying out the experimental studies is acknowledged. The first author would like to thank CSIR-Senior Research Fellowship for the financial support.

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