Abstract
This paper presents an experimental investigation that was conducted to examine those
properties of interest with regard to the passage of water through pervious concrete. A total of
30 mixtures of pervious concrete were prepared at water-cementitious ratios (w/cm) varied
from 0.25 to 0.40. Three aggregate types and sizes were used consisting of 13.2, 9.5 and 6.7
mm granite stone; 6.7 mm shale and 9.5 mm dolomite. Pozzolans were incorporated into
mixtures in proportions of 20, 30 and 50% fly ash (FA) or 30% and 50% ground granulated
blast furnace slag (GGBS). Compressive strength development in the mixtures was monitored
at 7, 14, and 60 days. It was found that strength gain after 14 days generally occurred only in
mixtures containing pozzolans. A unique behavior in property relations of pervious concrete
was found with compressive strength increasing and porosity decreasing with increase in
w/cm, contrary to established knowledge of conventional concrete properties. It was found
that mixtures made with 6.7 or 9.5 mm granite stone gave porosity and permeability
characteristics that were most suitable for hydrologic applications. Similarly, incorporation of
20% FA, 30% or 50% GGBS in the mixtures gave the most appropriate mechanical and
transport properties.