Nanosilica is silica with a nano size ranging from 1 to 100 nm, and it functions to enhance the compressive strength of concrete. Nanosilica can be produced through a synthesis process using fly ash. The material used in this study is fly ash. This research uses molarity variations of 1 molar, 2 molar, and 3 molar. In this study, microstructure testing is conducted to analyze the extraction res…