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Wireless Monitoring of Moisture Content in Mineral Materials by Electrical Impedance Measurements

Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 6)

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.

Keywords

Impedance measurements Mineral materials Moisture Salt Salt 

Notes

Acknowledgements

This work is supported by the European Commission under the grant agreement no. 212939 (Project: Smart Monitoring of Historic Structures - SMooHS, homepage: http://www.smoohs.eu) within the 7th framework programme.

References

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    SMooHS - Smart Monitoring of Historic Structures. European Commission (EU). Seventh Framework Programme - ENVIRONMENT. Project reference: 212939. URL: http://www.smoohs.eu. 18. January 2011.
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    Hamann, C.H., Hamnett, A., Vielstich, W.: Electrochemistry. Wiley-VCH, Weinheim, 2007.Google Scholar
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    Fafilek, G.: Leitfähigkeit. Wahlübung zur Elektrochemie. Institut für Chemische Technologien und Analytik, TU Wien, 2009.Google Scholar
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    URL: http://www.shm.uni-stuttgart.de. 18. January 2011.
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Copyright information

© RILEM 2013

Authors and Affiliations

  1. 1.Materialprüfungsanstalt Universität StuttgartStuttgartGermany

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