As shown in Table 2, the total porosity in pervious concrete ranged
from 14% to 22%, but pervious concrete with dolomite aggregate
(concrete mixtures M2 and M4) had a higher porosity
(about 23% higher) compared to pervious concrete with steel slag
aggregate (M3 and M5). A higher proportion of the coarse fraction
in mixtures (M4 and M5) with both types of aggregate (dolomite
and slag) resulted in a higher total porosity, which agreed with
observations of the American Concrete Institute