Wireless monitoring of moisture content in mineral materials by electrical impedance measurements

F. Lehmann*, J. Frick, M. Krüger, K. Menzel

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Changes in the moisture content and the resulting recrystallisation of the entrained salts is one of the major damage causes in historic materials like natural stones, tiles, plasters and mortars. This paper presents a new development in wireless monitoring of the moisture content in historic mineral materials. In this ongoing research, electrical impedance measurements are carried out to monitor the changes in the measured electrical conductivity of materials, as affected by both the total moisture content and the salt concentration. A measurement system consisting of a pair of electrodes, a sensor board and a low power data acquisition hardware was developed which was optimised for use in wireless sensor networks. Initial results of the laboratory validation tests are presented in the paper.

Original languageEnglish
Title of host publicationNondestructive Testing of Materials and Structures
Subtitle of host publicationProceedings of NDTMS-2011, Istanbul, Turkey,May 15-18, 2011
Pages1165-1171
Number of pages7
DOIs
Publication statusPublished - 1 Dec 2012
Externally publishedYes

Publication series

NameRILEM Bookseries
Volume6
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

Keywords

  • Impedance measurements
  • Mineral materials
  • Moisture
  • Salt
  • Wireless monitoring

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials

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