Permeability prediction and pore structure feature of pervious concrete using brick as aggregate

The scarcity of regular construction material has always been a challenging concern in some of the North-Eastern states of India like Tripura. To meet this inordinate shortage, brick aggregate has earned an immense attention due to its availability and low cost. The main purpose of this paper is to correlate the pore structure and hydraulic conductivity of the porous concrete matrix using brick aggregate to meet the insufficiency of conventional aggregates. Pervious concrete pavement, due to its eminence as an eco-friendly pavement system, has become an emerging technology in the developed and developing countries. In this paper, a series of pervious concrete mixes are made with over burnt brick aggregate and the porosity and permeability are evaluated. Water-cement ratio, aggregate size and the presence of fine aggregate in the porous mix are chosen as the mix variables and their contributions in controlling the permeability is quantified. A relationship is then drawn between permeability and the pore features considering the relative mean pore size and pore tortuosity. A modified Kozney-Carman model for pervious concrete is also developed using the investigational test results and the predicted equations. The predicted values and the developed relationships provide a very good agreement with experimental test results. (C) 2019 Elsevier Ltd. All rights reserved.