DefinePK

Abstract

Fly ash is a side waste from the cement industry that can damage the environment. Fly ash has the potential as an essential material in making geopolymers. The study discusses how the relationship of the use of activator composition with the compressive strength of geopolymer mortar using fly ash. The sample uses activator sie NaOH and Na2SiO3. The sample uses several variations of NaOH composition and alkali modulus. NaOH variations consist of 13 M, 14 M, 15 M, and 16 M. Variations in alkali modulus include 1.5, 1.75, 2.00, 2.25, and 2.50. Treatment of samples according to room temperature and compressive strength testing was carried out at 7, 14, 28, and 56 days. Research has shown that the correlation between NaOH and alkali modulus on mortar strength is very significant. The highest compressive strength occurs at 14 M of all variations. The relationship of activator composition and compressive strength form 2nd polynomial equation order and NaOH optimum composition occurs between 14 and 15 M.