Comparing the influence
of aggregate type, it can be found that the connected porosity
for pervious concrete made with EAFS was higher than that made
with gravel. This reason comes from the fact that the initial packing
porosity for EAFS was higher than gravel due to the porous nature
of EAFS. Therefore, under the same filled percentage of voids by
binder the pervious concrete made with EAFS would have a higher
connected porosity than that made with gravel. In addition, using
the same aggregate the pervious concrete made with OPC had a
lower connected porosity than that made with AASC under the
same filled percentage of voids by binder. It is known that the contraction
of AASC is much apparent than OPC [32], consequently, as
the same filled percentage is used the more serious contraction of
AASC results in a larger volume of connected porosity. Also, when
the filled percentage of voids by binder increased the connected
porosity decreased. It is natural since when the filled percentage
of voids increased more voids were filled by binder and consequently
the connected porosity decreased.
Table 2
Chemical compositions of EAFS.
Chemical composition Range (%) Average (%)
SiO2 14.91–42.2 21.38
Al2O3 1.78–12.27 6.09
CaO 5.55–39.58 23.4
MgO 1.89–17.63 8.32
SO3 0.01–0.08 0.03
S 0.003–0.222 0.07
FeO 0.92–48.28 18.87
Others 21.84
Table 3
Mix designs (w/c = 0.35 or L/Sg = 0.35).
Aggregate label Filled percentage of voids
by cement paste (%), V
Coarse aggregate
(kg/m3)
Cement
(kg/m3)
Water
(kg/m3)
Blast furnace