In this paper, an analysis of the pore structure features of pervious concretes designed for similar porosities using two different proportioning methods – one with higher paste contents and lower compactive efforts and another with lower paste contents and higher compactive efforts – is carried out.
With aggregate interlock playing such a critical role in shear behavior (Taylor 1970 , 1972 1974), SCC mixes that rely on material-based changes—higher paste contents and smaller rounded aggregates may result in substantially reduced shear strength.
In general, concrete mixtures with higher aggregate content (and correspondingly, lower paste content) exhibit a reduced tendency to crack.
Moreover, increasing the paste content allows compensating this fluidity loss.
Several parameters have been studied independently as fiber length, fiber content, or the paste content.
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A methodology to proportion pervious concrete mixtures of desired porosity using high or low cement paste contents is provided in this paper along with the compressive response of these mixtures.
In particular, SCCs generally contain higher paste volumes, larger contents of mineral admixtures and often lower binder to water ratios than VCs.
The porosities (both from volumetric and image analysis based methods) and characteristic pore sizes obtained from morphological functions are found to be statistically similar for the high-paste and low-paste content mixtures, while the low-paste content mixtures show a higher specific surface area of pores.
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