Industrial wastes or by-products can be used to create artificial aggregates. Solid waste created by the palm oil industry is a significant environmental problem that requires immediate and long-term solutions. The optimal ratio of geopolymer-based palm oil boiler ash (POBA) aggregate in terms of specific gravity, water absorption, and aggregate impact value was explored in this work. Because of its high percentages of silica oxide (SiO2) and aluminium oxide (Al2O3), POBA was chosen as the primary precursor for the geopolymer (Al2O3). The POBA aggregate with the lowest specific gravity was 1.662, while all of the geopolymer-based POBA aggregates had specific gravities below 2. The geopolymer-based POBA aggregate absorbs more water than the natural aggregate. The aggregate effect value for sodium hydroxide concentrations (6M, 8M, 10M, 12M, 14M) is less than 30%, which is considered strong.
