It is worth noting that with the use of slag, the overall
porosity as well as the open porosity decreased significantly. It
can be seen from Figs. 4 and 5 in the case of slag (M3, M5) that total
porosity and connected porosity were lower compared to the
dolomite aggregate samples (M2, M4). Since the porosity obtained
by hydrostatic weighing did not differ to a great extent among
samples, samples with slag may possess capillary pores that were
not detected by microtomography because of the resolution. But the main parameter for characterizing pervious concrete is pore
connectivity, which was the highest in sample M4.