4.6 Article

Piezoresistive geopolymer enabled by crack-surface coating

Journal

MATERIALS LETTERS
Volume 255, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.matlet.2019.126582

Keywords

Geopolymer; Conductive polymer; Contact mechanics; Piezo-resistance; Self-sensing

Funding

  1. Center for Infrastructure Engineering Studies at Missouri ST
  2. Missouri Department of Transportation [TR202008]

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The conductive polymer was introduced to crack surfaces in geopolymers to enable piezo-resistivity. In combination with crack morphology characterization and the piezo-resistive test, the functionalized geopolymer was found to achieve a high sensitivity (with Delta R/R-0/Delta epsilon equals to 376.9 for loading and 513.3 for unloading) to both small external stress (less than 2 MPa) and wide range of strains (up to 1700 mu epsilon). This piezo-resistive behavior can be well described by a coupled mechanical-conductive contact mechanism. A new way to enable the self-sensing function of materials utilizing their existing micro-features was successfully proposed and validated. (C) 2019 Elsevier B.V. All rights reserved.

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