Nanosilica is nano-sized silica which is around 1-100 nm and has a function to increase the compressive strength of concrete. Nanosilica can be produced by extraction process from fly ash waste. The materials used in this study were fly ash, Hydrochloric acid (HCl) solution, Sodium Hydroxide (NaOH) solution, and distilled water. This study used variations in drying time for 12, 15, and 18 hours…