Influence of pore morphology on the durability of sedimentary building stones from Aragon (Spain) subjected to standard salt decay tests |
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Authors: | Oscar Buj Josep Gisbert |
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Institution: | (1) Department of Earth Sciences, University of Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain |
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Abstract: | The aim of the present article is to identify the influence of the pore morphology on the physical behaviour and durability
of natural stone. Fifteen sedimentary rocks commonly used in the cultural and architectural heritage of Aragon (Spain) were
characterized. The petrography, porous structure, fluid transport properties and durability of these rocks were analysed.
They were classified into two different groups according to the results of the different tests. For each of these groups the
physical behaviour was established. A principal components analysis was used in order to examine the correlation between pore
structure, hydric properties and durability. The results show that the percentage of pore throats <0.1 μm control the fluid
transport properties, have an important influence on stone durability, and can be used to predict resistance to salt decay
while the average pore size does not. Stones with a high percentage of pore throats <0.1 μm are less susceptible to salt decay
than stones with higher pore size if their pore network is characterized by high tortuosity and low connectivity. |
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