Abstract:
The shape and size of aggregates are rarely investigated in pervious concrete
research despite their impact on porosity and compressive strength.
This study analyses the impact of size and shape distribution of aggregates
and mix design on compressive strength and porosity of pervious concrete.
486 specimens of 81 different designs (aggregate-size, aggregate-shape,
aggregate-to-cement ratio and compaction) were investigated. Compressive
strength was measured after 28 days of curing. The porosity of samples
was estimated as theoretical porosity (computed from constituent
ratios) and measured porosity (using water displacement). Data visualisation
was used for pattern recognition while ANOVA, Post-hoc and Bayesian
independent t-Tests were employed to statistically verify effects. A significant
impact of aggregate-shape on porosity and compressive strength
was observed while aggregate size significantly lesser impact. Aggregate
to cement ratio had a larger impact on compressive strength while compaction
had a significant yet lower impact. Porosity and compressive
strengths had different relationships for different shapes of aggregates.
