Three-Dimensional Electrical Impedance Tomography to Monitor Unsaturated Moisture Ingress in Cement-Based Materials

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Three-Dimensional Electrical Impedance Tomography to Monitor Unsaturated Moisture Ingress in Cement-Based Materials. / Smyl, Danny; Hallaji, Milad; Seppänen, Aku; Pour-Ghaz, Mohammad.

julkaisussa: Transport in Porous Media, Vuosikerta 115, Nro 1, 10.2016, s. 101-124.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Smyl, Danny ; Hallaji, Milad ; Seppänen, Aku ; Pour-Ghaz, Mohammad. / Three-Dimensional Electrical Impedance Tomography to Monitor Unsaturated Moisture Ingress in Cement-Based Materials. Julkaisussa: Transport in Porous Media. 2016 ; Vuosikerta 115, Nro 1. Sivut 101-124.

Bibtex - Lataa

@article{d8732ca15d2e4d6eab0ac417bc3217b8,
title = "Three-Dimensional Electrical Impedance Tomography to Monitor Unsaturated Moisture Ingress in Cement-Based Materials",
abstract = "The development of tools to monitor unsaturated moisture flow in cement-based material is of great importance, as most degradation processes in cement-based materials take place in the presence of moisture. In this paper, the feasibility of electrical impedance tomography (EIT) to monitor three-dimensional (3D) moisture flow in mortar containing fine aggregates is investigated. In the experiments, EIT measurements are taken during moisture ingress in mortar, using electrodes attached on the outer surface of specimens. For EIT, the so-called difference imaging scheme is adopted to reconstruct the change of the 3D electrical conductivity distribution within a specimen caused by the ingress of water into mortar. To study the ability of EIT to detect differences in the rate of ingress, the experiment is performed using plain water and with water containing a viscosity-modifying agent yielding a slower flow rate. To corroborate EIT, X-ray computed tomography (CT) and simulations of unsaturated moisture flow are carried out. While X-ray CT shows contrast with respect to background only in highly saturated regions, EIT shows the conductivity change also in the regions of low degree of saturation. The results of EIT compare well with simulations of unsaturated moisture flow. Moreover, the EIT reconstructions show a clear difference between the cases of water without and with the viscosity-modifying agent and demonstrate the ability of EIT to distinguish between different flow rates.",
keywords = "Concrete, Electrical impedance tomography, Unsaturated moisture transport, Electrical methods, X-ray computed tomography, CURRENT COMPUTED-TOMOGRAPHY, POROUS-MEDIA, X-RAY, TIKHONOV REGULARIZATION, RESISTIVITY TOMOGRAPHY, HYDRAULIC CONDUCTIVITY, NEUTRON-RADIOGRAPHY, WATER PENETRATION, IONIC INGRESS, SOIL SAMPLES",
author = "Danny Smyl and Milad Hallaji and Aku Sepp{\"a}nen and Mohammad Pour-Ghaz",
year = "2016",
month = "10",
doi = "10.1007/s11242-016-0756-1",
language = "English",
volume = "115",
pages = "101--124",
journal = "Transport in Porous Media",
issn = "0169-3913",
number = "1",

}

RIS - Lataa

TY - JOUR

T1 - Three-Dimensional Electrical Impedance Tomography to Monitor Unsaturated Moisture Ingress in Cement-Based Materials

AU - Smyl, Danny

AU - Hallaji, Milad

AU - Seppänen, Aku

AU - Pour-Ghaz, Mohammad

PY - 2016/10

Y1 - 2016/10

N2 - The development of tools to monitor unsaturated moisture flow in cement-based material is of great importance, as most degradation processes in cement-based materials take place in the presence of moisture. In this paper, the feasibility of electrical impedance tomography (EIT) to monitor three-dimensional (3D) moisture flow in mortar containing fine aggregates is investigated. In the experiments, EIT measurements are taken during moisture ingress in mortar, using electrodes attached on the outer surface of specimens. For EIT, the so-called difference imaging scheme is adopted to reconstruct the change of the 3D electrical conductivity distribution within a specimen caused by the ingress of water into mortar. To study the ability of EIT to detect differences in the rate of ingress, the experiment is performed using plain water and with water containing a viscosity-modifying agent yielding a slower flow rate. To corroborate EIT, X-ray computed tomography (CT) and simulations of unsaturated moisture flow are carried out. While X-ray CT shows contrast with respect to background only in highly saturated regions, EIT shows the conductivity change also in the regions of low degree of saturation. The results of EIT compare well with simulations of unsaturated moisture flow. Moreover, the EIT reconstructions show a clear difference between the cases of water without and with the viscosity-modifying agent and demonstrate the ability of EIT to distinguish between different flow rates.

AB - The development of tools to monitor unsaturated moisture flow in cement-based material is of great importance, as most degradation processes in cement-based materials take place in the presence of moisture. In this paper, the feasibility of electrical impedance tomography (EIT) to monitor three-dimensional (3D) moisture flow in mortar containing fine aggregates is investigated. In the experiments, EIT measurements are taken during moisture ingress in mortar, using electrodes attached on the outer surface of specimens. For EIT, the so-called difference imaging scheme is adopted to reconstruct the change of the 3D electrical conductivity distribution within a specimen caused by the ingress of water into mortar. To study the ability of EIT to detect differences in the rate of ingress, the experiment is performed using plain water and with water containing a viscosity-modifying agent yielding a slower flow rate. To corroborate EIT, X-ray computed tomography (CT) and simulations of unsaturated moisture flow are carried out. While X-ray CT shows contrast with respect to background only in highly saturated regions, EIT shows the conductivity change also in the regions of low degree of saturation. The results of EIT compare well with simulations of unsaturated moisture flow. Moreover, the EIT reconstructions show a clear difference between the cases of water without and with the viscosity-modifying agent and demonstrate the ability of EIT to distinguish between different flow rates.

KW - Concrete

KW - Electrical impedance tomography

KW - Unsaturated moisture transport

KW - Electrical methods

KW - X-ray computed tomography

KW - CURRENT COMPUTED-TOMOGRAPHY

KW - POROUS-MEDIA

KW - X-RAY

KW - TIKHONOV REGULARIZATION

KW - RESISTIVITY TOMOGRAPHY

KW - HYDRAULIC CONDUCTIVITY

KW - NEUTRON-RADIOGRAPHY

KW - WATER PENETRATION

KW - IONIC INGRESS

KW - SOIL SAMPLES

U2 - 10.1007/s11242-016-0756-1

DO - 10.1007/s11242-016-0756-1

M3 - Article

VL - 115

SP - 101

EP - 124

JO - Transport in Porous Media

JF - Transport in Porous Media

SN - 0169-3913

IS - 1

ER -

ID: 15877668