Influence of pore system characteristics on limestone vulnerability: a laboratory study |
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| Authors: | G Cultrone L G Russo C Calabrò M Uro?evi? A Pezzino |
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| Institution: | (1) Department of Mineralogy and Petrology, University of Granada, Avda, Fuentenueva, 18002 Granada, Spain;(2) Department of Geology, University of Catania, Corso Italia 57, 95100 Catania, Italy |
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| Abstract: | Hyblean limestone of Oligo-Miocene age was widely used as a construction material in the architectural heritage of Eastern
Sicily (Italy). Among them, the so-called Pietra Bianca di Melilli (Melilli limestone) and Calcare di Siracusa (Syracuse limestone)
were prized for their attractive appearance, ease of quarrying, and workability. Syracuse limestone shows general weathering,
whereas Melilli limestone is better preserved, and only differential erosion or superficial exfoliation can be detected in
monuments. The cause of the different behavior of these two limestones was investigated from the petrographic and petrophysical
points of view. The saturation coefficient is higher in Melilli limestone, and ultrasound measurements indicate that it is
less compact than Syracuse limestone, so that Melilli limestone could deteriorate more easily than Syracuse limestone. However,
pore interconnections and the size of very small pores play the main role in the durability of both materials. The “irregularity”
of the Syracuse pore system and its greater number of micropores hinder water flow through the exterior, promote stress in
pore structure, and favor the development of scaling, as confirmed by salt crystallization tests. In Melilli limestone, the
low concentration of micropores and fast water evaporation allow solutions to reach the surface more easily, resulting in
less damaging efflorescence. |
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| Keywords: | Limestones Pore system Crystallization pressure Durability |
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