This paper is focused on evaluating the performance of different pervious concrete mixtures in an endeavour to achieve an optimized mix with adequate tensile strength and porosity. In addition, a relationship was investigated between permeability and porosity of different mixtures. This is done in an attempt to use the porosity as a quick and easy quality control test for evaluating the permeability of pervious concrete. The mix design variables investigated in this study included aggregate-to-cementing materials ratio (A/CM), aggregate gradation and cementing materials blends; ternary blends of silica fume/slag and Metakaolin/Slag were examined. Single and hybrid fibre systems were also evaluated. These included Wollastonite natural fibres and polypropylene macro-fibres. Modifications to the permeability test proposed by ACI522R, “Pervious Concrete”, were made to evaluate permeability of the specimens.
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