Correlations among physical properties of pervious concrete with different aggregate sizes and mix proportions

TL;DR

This study investigates how aggregate sizes and mix proportions influence the physical properties of pervious concrete, revealing key correlations and effects on porosity, strength, and durability for urban pavement applications.

Contribution

It provides new insights into the relationships between aggregate size, mix ratios, and physical properties of pervious concrete, including power law and linear correlations.

Findings

Lower aggregate-to-cement ratios reduce porosity and permeability.

Aggregate sizes influence pore and cement structure more than mix proportions.

Porosity, permeability, and strength are correlated by a power law.

Abstract

Permeable pavement material can benefit urban environment. Here in this work, different aggregate sizes and mix proportions were used to manufacture pervious pavement concrete and investigate correlations among its properties. The porosity, permeability, compressive strength, inner structure, thermal conductivity, and abrasion resistance of the specimens were obtained. Results showed lower aggregate-to-cement ratios and higher water-to-cement ratios led to porosity reduction, which decreased the permeability coefficient but increased the compressive strength, thermal conductivity, and abrasion resistance of the pervious concrete. Compared to the mixes, the aggregate sizes affected the physical properties of pervious concrete less. However, the sizes of pores and cement in the pervious concrete were more affected by aggregate sizes than by mixes. Moreover, the porosity, permeability coefficient, and compressive strength of the pervious concrete can be correlated by the power law, whereas the correlation between the porosity and abrasion resistance index can be fitted by a linear law.