Properties of pervious geopolymer concrete using recycled aggregates

In this paper, the use of recycled aggregates (RAs) for making pervious geopolymer concrete (PGC) was studied. PGCs were prepared from high-calcium fly ash (FA), sodium silicate (Na2SiO3) solution, sodium hydroxide (NaOH) solution, and two different types of RA viz., crushed structural concrete member (RC) and crushed clay brick (RB). The results were also compared with those of natural coarse aggregate (NA). Compressive strength, splitting tensile strength, total void ratio, and water permeability coefficient of the PGCs were determined. The results indicate that both RC and RB can be used as recycled coarse aggregates for making PGC with acceptable properties.

► Recycled aggregates (RAs) were used to make pervious geopolymer concrete (PGC).
► PGCs were prepared from high-calcium fly ash geopolymer binder and two different types of RA.
► Mechanical properties, total void ratio, and water permeability were tested.
► These RA could be used as coarse aggregates to produce PGC with acceptable properties.