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Thermal stress in the Apuan marbles: relationships between microstructure and petrophysical characteristics (Articolo in rivista)

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Thermal stress in the Apuan marbles: relationships between microstructure and petrophysical characteristics (Articolo in rivista) (literal)

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Emma Cantisani a; , Elena Pecchioni b; Fabio Fratini c; Carlo Alberto Garzonio a; Piergiorgio Malesani b; Giancarlo Molli d; (2009)
Thermal stress in the Apuan marbles: relationships between microstructure and petrophysical characteristics
in International journal of rock mechanics and mining sciences (1997); Elsevier BV, Amsterdam (Paesi Bassi)
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Emma Cantisani a; , Elena Pecchioni b; Fabio Fratini c; Carlo Alberto Garzonio a; Piergiorgio Malesani b; Giancarlo Molli d; (literal)

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a Department of Restoration and Conservation of Architectural Heritage, University of Florence, 50121 Florence, Italy b Department of Earth Sciences, University of Florence, Florence, Italy c National Council of Research, Institute for the Conservation and Valorisation of Cultural Heritage, Florence, Italy d Department of Earth Sciences, University of Pisa, Pisa, It (literal)

Titolo

Thermal stress in the Apuan marbles: relationships between microstructure and petrophysical characteristics (literal)

Abstract

Apuan marbles originating from different zones of the Apuan Metamorphic Complex have been characterized from the chemical, petrographical, microstructural and physical points of view. All samples were subjected to accelerated ageing by thermal cycling and their petrophysical parameters evaluated. After accelerated ageing, all samples show an increase in total open porosity and/or porosity evaluated with Hg porosimeter in the range of pore sizes between 0.0037 and 150 mm. The greatest variations were recorded in the coarse and fine-grained marbles with straight grain boundaries. Two trends were observed in variation of the ratio of Hg-porosity to total open porosity after thermal cycling: either an increase in total open porosity not followed by a proportional increase in Hg-porosity or an increase in Hg-porosity proportional to an increase in total open porosity. During total immersion tests, an increase of the water absorption was observed for those samples characterised by a high ratio Hg-porosity/total open porosity with a unimodal distribution of Hgporosity. In the case of water absorption through capillarity, the samples that suffer a higher increase are those characterised by a bimodal pore size distribution, even if they possess low Hg-porosity. This behaviour underlines that in the aged samples, subjected to the two different mechanisms of water absorption, the pore size distribution plays an important role. (literal)

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