Optimization of pervious concrete mixture incorporating recycled concrete aggregates, silica fume, and SBR

Abstract

This study was conducted in an attempt to optimize the hydraulic, mechanical, and durability properties of pervious concrete while enhancing its sustainability through the use of recycled concrete aggregates RCA, silica fume SF, and Styrene Butadiene Rubber SBR for different water to binder ratios w/b. The mixtures were designed using the Taguchi method which served to optimize the combination of design parameters of the pervious concrete mixtures to be tested. Four design parameters (variables) of three levels each were investigated, namely, the water to binder ratio, however, for a constant binder content, percentage of replacement by weight of each, natural aggregate with recycled concrete aggregate, cement with silica fume, and cement with SBR. Thus, a total of nine mixes in addition to 1 control mix were prepared and subjected to testing. The properties evaluated for were hardened density, hardened porosity, permeability, compressive strength, splitting tensile strength, and abrasion resistance. TOPSIS was then used to optimize the mixture proportions based on the latter performance criteria. It was revealed that a sustainable pervious concrete mixture of superior hydraulic, strength, and durability properties can be proportioned with 50% RCA with the use of ideal doses of SF, SBR, and water.