These days, cement-based concrete can be used in place of low calcium fly ash-based geopolymer concrete to prevent the negative environmental effects of cement production. Significantly, less CO2 is released into the environment when geopolymer concrete, which uses pulverised sewage sludge (PSS) and pulverised bottom ash (PBA) instead of standard concrete, is used although geopolymer concrete performs little less than Portland cement concrete. The goal of the current study was to enhance the performance of geopolymer concrete using submicron PSS and PBA. Geopolymer concrete was produced using unitary and binary combinations, specifically PSS and PBA as cementitious ingredients. The binary combination mentioned above was made using different proportions of sewage sludge and bottom ash. Testing was done on the geopolymer composite’s mechanical and long-lasting qualities. In order to determine the porosity of concrete, tests for fast chloride permeability and sulphate attack were conducted in addition to mechanical properties in geopolymer composites. According to the results, the concrete’s strength and durability had improved the most at a dose of 50% PSS and 50% PBA. The split tensile and compressive strengths of the geopolymer mixture were found to be the greatest at 8.3 MPa and 51.4 MPa, respectively. The specimen’s percentage of sulphate attack and quick chloride permeability test results were determined to be the lowest.