The effects of aggregate gradation, amount, and size on pervious portland cement concrete PCC static modulus of elasticity
were compared using four different mixtures. A standard mix and three variable mixes using a uniform gradation, increased aggregate
amount, and increased aggregate size were used. The effective air void content was determined for each mixture. The compressive
strengths and static elastic moduli were determined and compared at equal void contents. For a uniform gradation, the compressive
strengths and static elastic moduli appeared to be higher within an optimal range of voids; however, there was no statistically significant
difference between the results from the different gradations. An increased aggregate amount resulted in a statistically significant decrease
in both compressive strength and static elastic moduli due to the subsequent decrease in paste amount. While the compressive strengths
were higher for mixtures containing smaller aggregate sizes, there was no significant difference between the static elastic moduli when
different aggregate sizes were used. Further research is needed to understand the effects of aggregate size on the static modulus of
elasticity of pervious PCC.