Study of water mass transfer dynamics in frescoes by dielectric spectroscopy

Olmi, R. and Riminesi, C. (2008) Study of water mass transfer dynamics in frescoes by dielectric spectroscopy. Il nuovo cimento C, 31 (3). pp. 389-402. ISSN 1826-9885

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The knowledge of moisture content (MC) is essential for determining the state of preservation of various types of hand-work: from building materials, such as bricks and concrete, to objects of artistic value, in particular frescoes and mural paintings. In all the above, moisture is the primary source of damages, as it affects the durability of porous materials. Dielectric properties of porous materials are strongly affected by the presence of water, suggesting dielectric spectroscopy as a suitable non-invasive diagnostic technique. The development of a quantitative relationship between MC and permittivity requires to investigate the dynamics of water mass transfer in porous media, and to determine its effect on the dielectric properties. In this paper a coupled mass transfer/dielectric problem is introduced and solved numerically, based on a finite element model. Results are compared to experimental dielectric measurement performed on plaster samples by the open coaxial method. The application of the dielectric technique to frescoes monitoring is proposed, showing the results obtained in an on-site study.

Item Type: Article
Uncontrolled Keywords: Dielectric properties of solids and liquids ; Microwave circuits ; Industrial and technological research and development
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 23 Mar 2020 16:22
Last Modified: 23 Mar 2020 16:22

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