Performance Evaluation of Self-Compacting Geopolymer Concrete with Recycled Brick Aggregate under Varied Curing and Temperature Conditions

In recent days, Self-Compacting Geopolymer Concrete (SCGC) has the potential to revolutionize concrete technology by combining the benefits of both Geopolymer Concrete (GPC) and Self-Compacting Concrete (SCC). The production of SCGC requires proper selection of materials and proportions to achieve a composite concrete with a refined pore structure and low permeability. Additionally, chemical and mineral admixtures play a crucial role in enhancing and refining the pore structure of SCGC, as mineral admixtures reduce the absorbency of the cement matrix further and improve the porosity of the aggregates. In this investigation, the impact of high temperatures on the properties of SCGC was examined. The main focus of this research is to assess the influence of 8 M, 10 M, and 12 M NaOH solutions on the workability, mechanical properties, and durability of Fly Ash (FA) and Ground Granulated Blast Furnace Slag (GGBS)-based SCGC. The SCGC with 12 M NaOH was selected for partial replacement of normal aggregates with Recycled Brick Aggregate (RBA). In this context, Recycled Brick Aggregate replaced coarse aggregate (CA) in the range of 20% to 100%. The curing temperature was varied from ambient conditions up to 120 °C. Furthermore, the abrasion and impact resistance of the concrete, which are crucial for its durability, were also evaluated. Durability tests including water absorption, acid attack, Rapid Chloride Permeability Test (RCPT), sorptivity, and alkalinity were conducted on the SCGC samples, and the results were analysed.