ABSTRACT:

Volcanic rocks are widespread in different geological contexts and exhibit complex behaviors, from hard to extremely soft rocks, depending on mineralogy, porosity, and weathering. In particular, their mechanical properties are influenced by the size and shape of pores. We report the results of porosity characterization by different techniques, performed on lavas with different degrees of alteration, sampled in the Campi Flegrei area (Italy) and characterized through petrographic analyses. Bulk-specific weight measurements, water immersion and Hg-porosimetry gave total and interconnected porosity values. Analysis of thin sections provided 2D pore size and shape estimates and insight in pore relationships with rock matrix and weathering. X-ray Computer Tomography allowed complete 3D reconstruction of rock pores. Different image processing methods for data extraction and analysis have been used to develop a standard analysis procedure. Results in terms of measured porosity and pore size and shape distributions obtained by different techniques are discussed.

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