Abstract:
This study examined the influence of aggregate gradation on compressive strength and porosity in
Pervious Concrete (PC) subjected to various compaction efforts. Two aggregate gradations 12–18 and
18–25 mm were recombined in different proportions in the range of 10–50% to obtain five different
gradations. PC specimens were cast with these five aggregate gradations by applying standard
Proctor compaction, varying efforts from 0 to 75 blows. Test results indicated that wet density and
compressive strength increased with compaction effort at higher rate for specimens casted with
Aggregate-to-Cement (A/C) ratio 2.5 than 5.0, but porosity reduced at almost the same rate for both
A/C ratios. Compressive strength reduced when aggregate gradation with larger size particles
increased, however porosity increased. Altering aggregate gradation or compaction effort yielded no
significant change in PC properties for A/C ratio of 5.0 than it did for 2.5. The developed mathematical
models predicted compressive strength and porosity of PC mixes in terms of aggregate gradation and
compaction effort. The highest mean deviation and relative error of model prediction were 1.377 MPa
and 10.4% for compressive strength, and 1.414% and 5.8% for porosity, respectively.
