Static contact angle (CA) test [30] was performed using an OCA 20 apparatus
(DataPhysics Instrument GmbH, Filderstadt, Germany). Static CAs were determined
using a drop volume of 5 ll, performing 15 measurements for each test sample on 3
uncoated samples and 2 specimens for each kind of different treatment (C1 and C2)
[30]. The determination of static contact angles for porous and rough surfaces, such
as that of travertine, is not simple and it is deeply influenced by surface irregularity,
so the results should be carefully considered
Static contact angle (CA) test [30] was performed using an OCA 20 apparatus(DataPhysics Instrument GmbH, Filderstadt, Germany). Static CAs were determinedusing a drop volume of 5 ll, performing 15 measurements for each test sample on 3uncoated samples and 2 specimens for each kind of different treatment (C1 and C2)[30]. The determination of static contact angles for porous and rough surfaces, suchas that of travertine, is not simple and it is deeply influenced by surface irregularity,so the results should be carefully considered
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