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This paper reports on our preliminary attempt to perform dynamic laboratory measurements of salt crystallization and subsequent deliquescence on a surface of a porous material specimen (autoclaved aerated concrete as a model material) by using a high-resolution digital optical microscope that allows generating three-dimensional images. A specimen that is initially filled with a NaCl solution is dried in a room at ~26°C and ~40% RH for 14 days and is then wetted in a desiccator at ~95% RH during the next 14 days. A temporal change of the spatial distribution of the volume occupied by salt crystals on the specimen surface is determined based on the contrast between two microscopic images successively taken with a certain interval of time. The mass of the specimen is also measured simultaneously to determine the rate of water evaporation/absorption. The results show that salt crystallization during drying is not spatially uniform throughout the specimen surface, which likely depends on the spatial distribution of the pore structure in the specimen, and salt crystal deliquesces faster near the edges of the specimen than in the centre, which indicates a stronger dependency of salt deliquescence on the geometry of the specimen than on the inner pore structure of the specimen. | This paper reports on our preliminary attempt to perform dynamic laboratory measurements of salt crystallization and subsequent deliquescence on a surface of a porous material specimen (autoclaved aerated concrete as a model material) by using a high-resolution digital optical microscope that allows generating three-dimensional images. A specimen that is initially filled with a NaCl solution is dried in a room at ~26°C and ~40% RH for 14 days and is then wetted in a desiccator at ~95% RH during the next 14 days. A temporal change of the spatial distribution of the volume occupied by salt crystals on the specimen surface is determined based on the contrast between two microscopic images successively taken with a certain interval of time. The mass of the specimen is also measured simultaneously to determine the rate of water evaporation/absorption. The results show that salt crystallization during drying is not spatially uniform throughout the specimen surface, which likely depends on the spatial distribution of the pore structure in the specimen, and salt crystal deliquesces faster near the edges of the specimen than in the centre, which indicates a stronger dependency of salt deliquescence on the geometry of the specimen than on the inner pore structure of the specimen. | ||
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Latest revision as of 15:50, 26 September 2017
| Author | Abuku, Masaru; Ogura, D.; Hokoi, S. |
| Year | 2017 |
| Title | A preliminary study on dynamic measurement of salt crystallization and deliquescence on a porous material surface using optical microscope |
| Bibtex | @inproceedings {Abuku.etal:2017,
title = {A preliminary study on dynamic measurement of salt crystallization and deliquescence on a porous material surface using optical microscope}, booktitle = {Proceedings of SWBSS 2017. Fourth International Conference on Salt Weathering of Buildings and Stone Sculptures, University of Applied Sciences Potsdam, Germany, 20-22 September 2017}, year = {2017}, editor = {Laue, Steffen}, pages = {42-48}, month = {september}, organization = {Fachhochschule Potsdam}, publisher = {Verlag der Fachhochschule Potsdam}, note = {fulltext, conference paper}, key = {SWBSS2017}, doi = {10.5165/hawk-hhg/319}, author = {Abuku, Masaru; Ogura, D.; Hokoi, S.} } |
| DOI | 10.5165/hawk-hhg/319 |
| Link | File:SWBSS 2017 Proceedings 42-48 Abuku Ogura Hokoi.pdf |
| Notes | in: Proceedings of SWBSS 2017 - Fourth International Conference on Salt Weathering of Buildings and Stone Sculptures. University of Applied Sciences, Potsdam, Germany, 20-22 September 2017 |
Bibliography[edit]
| [Abuku.etal:2017] | Abuku, Masaru; Ogura, D.; Hokoi, S. (2017): A preliminary study on dynamic measurement of salt crystallization and deliquescence on a porous material surface using optical microscope. In: Laue, Steffen (eds.): Proceedings of SWBSS 2017. Fourth International Conference on Salt Weathering of Buildings and Stone Sculptures, University of Applied Sciences Potsdam, Germany, 20-22 September 2017,Verlag der Fachhochschule Potsdam 42-48, 10.5165/hawk-hhg/319. |   |
Abstract[edit]
This paper reports on our preliminary attempt to perform dynamic laboratory measurements of salt crystallization and subsequent deliquescence on a surface of a porous material specimen (autoclaved aerated concrete as a model material) by using a high-resolution digital optical microscope that allows generating three-dimensional images. A specimen that is initially filled with a NaCl solution is dried in a room at ~26°C and ~40% RH for 14 days and is then wetted in a desiccator at ~95% RH during the next 14 days. A temporal change of the spatial distribution of the volume occupied by salt crystals on the specimen surface is determined based on the contrast between two microscopic images successively taken with a certain interval of time. The mass of the specimen is also measured simultaneously to determine the rate of water evaporation/absorption. The results show that salt crystallization during drying is not spatially uniform throughout the specimen surface, which likely depends on the spatial distribution of the pore structure in the specimen, and salt crystal deliquesces faster near the edges of the specimen than in the centre, which indicates a stronger dependency of salt deliquescence on the geometry of the specimen than on the inner pore structure of the specimen.