Building Materials Studied by MRI

Pel, Leo L; Huinink, H.P.

doi:10.1002/9780470034590.emrstm1294

Cited by 2 publications

(2 citation statements)

References 41 publications

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“…In the last case, however, the measurement of the NMR signal is not straightforward because porous building materials contain magnetic impurities such as ferromagnetic ions. Specific experimental procedures are therefore needed, and specially adapted NMR machines have to be used (Kopinga and Pel, 1994; Pel and Huinink, 2012).…”

Section: Methodsmentioning

confidence: 99%

Delamination of Ançã limestone due to sodium sulfate under different environmental conditions as studied by nuclear magnetic resonance

Brito

Saidov

Gonçalves

et al. 2014

Journal of Building Physics

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Sodium sulfate is one of the most damaging and complex salts typically involved in the deterioration of our architectural heritage. One of the main difficulties is to determine which of its crystalline phases, that is, thenardite, mirabilite, or the metastable heptahydrate, will precipitate under certain conditions. Indeed, there is a significant range of temperature and relative humidity in which these phases can crystallize. Furthermore, one precipitated crystalline phase may under certain conditions transform to another one. Here, we show that nuclear magnetic resonance can be successfully used to nondestructively define the phase being precipitated. We investigate delamination of Anc xã limestone due to sodium sulfate crystallization, a type of decay which is representative of those occurring in real constructions. The decay was achieved during isothermal drying of stone specimens under different environmental conditions. The work allowed concluding that both mirabilite and heptahydrate can be responsible for this type of decay in different conditions. The heptahydrate tends to crystallize when there is no previous presence of mirabilite crystals in the porous material.

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Section: Methodsmentioning

confidence: 99%

Delamination of Ançã limestone due to sodium sulfate under different environmental conditions as studied by nuclear magnetic resonance

Brito

Saidov

Gonçalves

et al. 2014

Journal of Building Physics

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“…The spatial resolution strongly depends upon the range of the applied magnetic field gradient and upon the presence of magnetic impurities in the materials. As a result, direct imaging of the micron scale pores may not be feasible with conventional instruments (Pel & Huinink, ). In terms of temporal resolution, nuclear magnetic resonance methods are more limited than neutron imaging, still they can be used to investigate both slow processes as drying and faster ones as capillary imbibition (Mitchell et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Visualization of water drying in porous materials by X‐ray phase contrast imaging

Yang

Griffa

Bonnin

et al. 2016

Journal of Microscopy

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We present in this study results from X-ray tomographic microscopy with synchrotron radiation performed both in attenuation and phase contrast modes on a limestone sample during two stages of water drying. No contrast agent was used in order to increase the X-ray attenuation by water. We show that only by using the phase contrast mode it is possible to achieve enough water content change resolution to investigate the drying process at the pore-scale. We performed 3D image analysis of the time-differential phase contrast tomogram. We show by the results of such analysis that it is possible to obtain a reliable characterization of the spatial redistribution of water in the resolved pore system in agreement with what expected from the theory of drying in porous media and from measurements performed with other approaches. We thus show the potential of X-ray phase contrast imaging for pore-scale investigations of reactive water transport processes which cannot be imaged by adding a contrast agent for exploiting the standard attenuation contrast imaging mode.

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Building Materials Studied by MRI

Cited by 2 publications

References 41 publications

Delamination of Ançã limestone due to sodium sulfate under different environmental conditions as studied by nuclear magnetic resonance

Delamination of Ançã limestone due to sodium sulfate under different environmental conditions as studied by nuclear magnetic resonance

Visualization of water drying in porous materials by X‐ray phase contrast imaging

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