Las sales solubles en el deterioro de rocas monumentales. Revisión bibliográfica

Materiales de Construcción (Impact Factor: 0.79). 01/1994; DOI: 10.3989/mc.1994.v44.i235.579
Source: DOAJ

ABSTRACT This paper points out the importance of soluble salts in the deterioration/conservation of monumental stones. The most frequent salts in monuments as well as their sources are referred. A review of the damage caused by these salts and the developed mechanisms of deterioration is also included. Finally, the distinctive behaviour of each type of salt and their distribution on the walls of buildings is shown.Se resalta la importancia que las sales solubles tienen en el deterioro/conservación de las rocas monumentales. Se relacionan aquellas sales que con mayor frecuencia aparecen en los monumentos y la procedencia de las mismas. A su vez se lleva a cabo una revisión de los daños originados por dichas sales y de los mecanismos de alteración desarrollados. Finalmente, se indica el diferente comportamiento de cada tipo de sal y su distribución en las paredes de los edificios.

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    Materiales de Construcción 01/2008; 58. · 0.79 Impact Factor
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    ABSTRACT: 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.
    Salt Weathering on Buildings and Stone Sculptures (SWBSS2014), Royal institute for Culture Heritage (KIK-IRPA), Brussels, belgium; 10/2014
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    ABSTRACT: This study assesses the changes on the surface of crystalline stones due to salt crystallisation. Efflorescence was forced to grow on the surface of granite and marbles through 60 cycles of salt crystallisation with sodium sulphate. Changes on surface roughness, gloss and colour were measured every 15 cycles and the specimens were examined with naked eye and SEM. Sodium sulphate produces damage which depends on mineral composition. Results show that granites experience a mechanical decay with an increase in roughness. Peaks of mica can be observed on the surface and cracks widen and grow deeper. Colour and gloss do not show any significant change, although gloss decreases with an increase in surface roughness. In marbles, the decay is mainly chemical. Surface roughness increases due to dissolution of the calcite. White marbles exhibit yellowing. Gloss decreases during the first cycles—as grain boundaries become more visible—but tends to regain almost its initial value as the number of cycles increases. In this case, gloss does not show any relation with surface roughness.
    Environmental earth sciences 09/2012; · 1.57 Impact Factor


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