Nanosilica is a type of silica with a particle size ranging from 1 to 100 nm, which serves to enhance the compressive strength of concrete. It can be synthesized from fly ash waste. This study utilized fly ash, H₂SO₄ solution, NaOH, and distilled water, synthesized using the precipitation method. Drying times of 1, 2, 3, and 4 hours were applied as variables. Microstructural analysis was co…