Natural stones like marbles are often employed as façade panels to externally cover buildings. These
natural materials tend to exhibit a quasi-brittle nonlinear fracture behaviour which, conversely to concrete
counterpart, has much less been studied in the literature. In the present paper, an experimental campaign on the
so-called red Verona marble is carried out, and the results are discussed together with some previously
published results on the white Carrara marble. The analysis of the two marbles as a whole allows us to discuss
size effect and to point out the need for additional parameters in order to describe their fracture behaviour. The
study focuses on a two-parameter model which accounts for a characteristic material length. A quantitative
correlation between material microstructure features, obtained from thin sections technique, and the
characteristic material length is proposed.
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