Impedance spectroscopy as a tool for moisture uptake monitoring in construction composites during service

Sotirios Grammatikos, Richard J. Ball, Mark Evernden, Ryan Jones

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This is a first study comparing dielectric spectroscopy and gravimetric measurements of moisture uptake in pultruded glass fibre reinforced polymers (FRPs). Specimens were subjected to sub-Tg hygrothermal aging for 224 days. Impedance spectra in the frequency range 0.1 Hz to 10 MHz were captured during exposure and compared with gravimetric measurements. Moisture concentration was found to increase the FRP’s dielectric permittivity monotonically and decrease bulk resistance. High quality dielectric data was obtained as moisture uptake is independent of inherent changes suggested by mass loss which compromise gravimetry. Dielectric measurements remained sensitive to moisture despite significant mass loss, which typically distorts the weight gain process complicating the commonly adopted gravimetric methodology. Real-time dielectric measurements were obtained from FRP specimens continuously immersed in water and without making use of any additional sensing elements. The novel approach adopted is of high commercial impact as moisture uptake control is recognized as a significant problem by industry.
LanguageEnglish
Pages108-117
Number of pages10
JournalComposites Part A - Applied Science and Manufacturing
Volume105
Early online date21 Nov 2017
DOIs
StatusPublished - 28 Feb 2018

Fingerprint

Moisture
Spectroscopy
Polymers
Monitoring
Composite materials
Moisture control
Dielectric spectroscopy
Fibers
Gravimetric analysis
Glass fibers
Permittivity
Aging of materials
Water
Industry

Keywords

  • Dielectric changes
  • Glass fibre reinforced polymer
  • Impedance spectroscopy
  • Moisture uptake

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

Cite this

Impedance spectroscopy as a tool for moisture uptake monitoring in construction composites during service. / Grammatikos, Sotirios; Ball, Richard J.; Evernden, Mark; Jones, Ryan.

In: Composites Part A - Applied Science and Manufacturing, Vol. 105, 28.02.2018, p. 108-117.

Research output: Contribution to journalArticle

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