Strength Properties of Geopolymer Concrete Modified with Recycled Aggregates

The main goal of this paper is to investigate the effects of recycled aggregates in geopolymer pervious concrete (GPC). The usage of recycled aggregate (RA) in the construction field is getting more attention nowadays due to sustainable construction methods. In this study, natural aggregates (NA) are partially replaced with recycled aggregates such as recycled concrete aggregate and recycled brick aggregate (RBA) in geopolymer previous concrete. For preparing geopolymer, ground granulated blast furnace slag (GGBS) was used in this investigation. Activators such as 12 M sodium hydroxide and sodium silicate solutions were used to synthesize the geopolymer concrete in this investigation. The sodium silicate-to-sodium hydroxide ratio was maintained at 2.5 throughout this study. Mechanical and durability properties of GPC were determined as per Indian standards. The effects of RA in geopolymer pervious concrete were briefly investigated. It has been observed that durability properties are affected by the incorporation of recycled aggregate (RA) in geopolymer concrete. The compressive strength value of RC12 is less than that of GC12 and RB12 is less than that of RC12. The strength properties of structural beam elements were reduced due to the incorporation of recycled concrete and recycled brick aggregate in geopolymer concrete; at the same time, the reduction always lies in acceptable ranges. Validation was done using ANSYS software. This paper leads the utilization of recycled aggregates in GGBS-based GPC instant of NA at ambient curing condition.