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The study on the wetting properties and surface free energy (SFE) of mineral-asphalt
mixtures was presented in the paper. The composition of the two mineral-asphalt mixtures was
prepared: the mixtures with dolomite and the mixtures with dolomite and recycled ceramic
aggregate. The use of different aggregates results in diversification of the wetting properties in
porous bituminous mixtures. The microstructure was shown based on the SEM study. The
wetting properties of mineral-asphalt mixtures were determined by measuring the contact angle
of their surface using water as measuring liquid. Measurements were carried out immediately
after the time of application of the drops. The total surface free energy (SFE) was determined
using the Neumann method. While analysing the examination results it can be noticed that the
values of contact angles depends on the type of aggregate used in mixtures and the smoothness
of mineral-asphalt mixtures surface. The highest contact angle was noticed for the bituminous
mixture with dolomite aggregate on flat surface. The smallest contact angle with water was
obtained for the mineral-asphalt mixture with dolomite and recycled ceramic aggregate on
rough surface. This is due to the physical characteristics of this aggregate. Ceramic aggregate is
characterized by the high absorbability. This indicates an increased wettability and adhesion
properties.
