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  • accepted_version_Composite_structures_paper

    Rights statement: This is the author’s version of a work that was accepted for publication in Composite Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Composite Structures, 201, 2018 DOI: 10.1016/j.compstruct.2018.06.101

    Accepted author manuscript, 242 KB, PDF document

    Available under license: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

  • Manuscript_figures_as_of_27_06_2018

    Rights statement: This is the author’s version of a work that was accepted for publication in Composite Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Composite Structures, 201, 2018 DOI: 10.1016/j.compstruct.2018.06.101

    Accepted author manuscript, 4.46 MB, PDF document

    Available under license: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

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Inherently multifunctional geopolymeric cementitious composite as electrical energy storage and self-sensing structural material

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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<mark>Journal publication date</mark>1/10/2018
<mark>Journal</mark>Composite Structures
Volume201
Number of pages13
Pages (from-to)766-778
Publication StatusPublished
Early online date2/07/18
<mark>Original language</mark>English

Abstract

In this paper, we demonstrate for the first time that potassium-geopolymeric (KGP) cementitious composites can be tuned to store and deliver energy, and sense themselves without adding any functional additives or physical sensors, thus creating intelligent concrete structures with built-in capacitors for electrical storage and sensors for structural health monitoring. Density function theory (DFT)-based simulations were performed to determine the electronic properties of the KGP cementitious composite and understand its conduction mechanism. Experimental characterization was also conducted to determine the structure, chemical composition, conduction mechanism, energy storage and sensing capabilities of the KGP cementitious composite. The DFT simulations suggested that the KGP cementitious composite relies on the diffusion of potassium (K+) ions to store electrical energy and sense mechanical stresses. The geopolymeric cementitious composite exhibited a good room temperature ionic conductivity in the range of 12 (10-2 S/m) and an activation energy as high as 0.97 eV. The maximum power density of the KGP capacitors is about 0.33kW/m2 with a discharge life of about 2 hours. The KGP stress sensors showed high sensitivity to compressive stress: 11 /MPa based on impedance measurement and 0.55 deg/MPa based on phase measurement. With further development and characterization, the KGP cementitious composite can be an integral part of concrete structures in the form of a battery to store and deliver power, and sensors to monitor the structural integrity of urban infrastructure such as bridges, buildings and roads.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Composite Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Composite Structures, 201, 2018 DOI: 10.1016/j.compstruct.2018.06.101