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{{Literatur
{{Literatur
|Autor=Abuku, M. and Ogura, D. and Hokoi, S. and Iba, C. and  Wakiya, S. and Uno, T.  
|Autor=Aly, N. and Gomez-Heras, M. and Hamed, A. and Alvarez de Buergo, M. and Soliman, F.  
|Jahr =2014
|Jahr =2014
|Titel=Measurement of sorption isotherm of porous materials influenced by salt
|Titel=Porosity changes after different temperature regimes for a salt weathering simulation test on Mokkattam limestone (Egypt)
|Bibtex=
|Bibtex=
|DOI=10.5165/hawk-hhg/242
|DOI=10.5165/hawk-hhg/243
|Link=[[Image:17_SWBSS-2014_Abuku_etal.pdf]]
|Link=[[Image:18_SWBSS-2014_Aly-Mohamed_etal.pdf]]
|Bemerkungen =In: De Clercq, Hilde (editor): Proceedings of SWBSS 2014. Third International Conference on Salt Weathering of Buildings and Stone Sculptures Royal Institute for Cultural Heritage, Brussels, Belgium, 14-16 October 2015, S. 237-246
|Bemerkungen =In: De Clercq, Hilde (editor): Proceedings of SWBSS 2014. Third International Conference on Salt Weathering of Buildings and Stone Sculptures Royal Institute for Cultural Heritage, Brussels, Belgium, 14-16 October 2016, S. 247-257
}}
}}


'''Eintrag in der Bibliographie'''
'''Eintrag in der Bibliographie'''


<bibprint citation="Abuku.etal:2014"/>
<bibprint citation="Aly-Mohamed.etal:2014"/>


== Keywords  ==
== Keywords  ==
moisture, water retention curve, absorption, desorption, salt crystal
stone decay, limestone, salt weathering, pore structure


== Abstract  ==
== Abstract  ==
This paper compiles the past data of the sorption isotherm of Autoclaved Aerated Concrete (AAC) laden with salts (MgCl<sub>2</sub> and NaCl) and some new experimental data for AAC that contains Na<sub>2</sub>SO<sub>4</sub>. The results are related to the type of salt, the salt concentration and the mass of salt that is considered to be crystallised. Finally the existing mathematical model that uses the sorption isotherm for pure water and the salt content in the material is applied to predict the sorption isotherm of AAC laden with Na2SO4. It is shown that even salts like Na<sub>2</sub>SO<sub>4</sub>, whose equilibrium relative humidity is 94%, significantly alter the sorption isotherm when a large amount of salt is crystallised in the material and this to an extent depends on the amount as well as the type of salt.
This study deals with the characterization of the pore structure of fresh quarry limestone samples belonging to the Mid-Eocene Mokattam Group, and porosity changes in samples subjected to salt crystallization tests at different temperatures (20, 30 and 40 °C) in a purpose-made simulation chamber based on feeding samples by capillary imbibitions. NaCl with fixed concentration (10%) was used in the different experimental tests. One more experiment was performed using only distilled water to discriminate changes due to salt crystallisation from those resulting just from wetting. In order to characterize the changes of the pore structure, fresh and weathered samples subjected to different temperature regimes tests were investigated by means of Mercury Intrusion Porosimetry (MIP), and Scanning Electron Microscopy (SEM). These results show the critical role of temperature in controlling the porosity changes after salt crystallisation.


== Zugehörige Primärdaten  ==
== Zugehörige Primärdaten  ==

Aktuelle Version vom 14. Januar 2016, 14:21 Uhr

Autor Aly, N. and Gomez-Heras, M. and Hamed, A. and Alvarez de Buergo, M. and Soliman, F.
Jahr 2014
Titel Porosity changes after different temperature regimes for a salt weathering simulation test on Mokkattam limestone (Egypt)
Bibtex
DOI 10.5165/hawk-hhg/243
Link Datei:18 SWBSS-2014 Aly-Mohamed etal.pdf
Bemerkungen In: De Clercq, Hilde (editor): Proceedings of SWBSS 2014. Third International Conference on Salt Weathering of Buildings and Stone Sculptures Royal Institute for Cultural Heritage, Brussels, Belgium, 14-16 October 2016, S. 247-257


Eintrag in der Bibliographie

[Aly-Mohamed.etal:2014]Aly, N.; Gomez-Heras, M.; Hamed, A.; Alvarez de Buergo, M.; Soliman, F. (2014): Porosity changes after different temperature regimes for a salt weathering simulation test on Mokkattam limestone. In: Hilde De Clercq (Hrsg.): Proceedings of SWBSS 2014 3rd International Conference on Salt Weathering of Buildings and Stone Sculptures,KIK-IRPA, Royal Institute for Cultural Heritage, Brussels 247-257, 10.5165/hawk-hhg/243.Link zu Google ScholarLink zum Volltext

Keywords[Bearbeiten]

stone decay, limestone, salt weathering, pore structure

Abstract[Bearbeiten]

This study deals with the characterization of the pore structure of fresh quarry limestone samples belonging to the Mid-Eocene Mokattam Group, and porosity changes in samples subjected to salt crystallization tests at different temperatures (20, 30 and 40 °C) in a purpose-made simulation chamber based on feeding samples by capillary imbibitions. NaCl with fixed concentration (10%) was used in the different experimental tests. One more experiment was performed using only distilled water to discriminate changes due to salt crystallisation from those resulting just from wetting. In order to characterize the changes of the pore structure, fresh and weathered samples subjected to different temperature regimes tests were investigated by means of Mercury Intrusion Porosimetry (MIP), and Scanning Electron Microscopy (SEM). These results show the critical role of temperature in controlling the porosity changes after salt crystallisation.

Zugehörige Primärdaten[Bearbeiten]

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