The aim of this study was to replace Portland
cement with fly ash-based geopolymer as precursors, to
serve as a binder after reacting with NaOH and Na2SiO3
activators. The test object existed in the form of a cube
of size 50 x 50 x 50 mm. The mortar was treated for 28
days and then immersed in a sulfate solution at similar
interval using the wet-dry cycle and non-cycle methods.
The compressive strength of the geopolymer mortar was
estimated as 45.90 MPa before immersion. Therefore,
35.79 MPa, 41.09 MPa, as well as 37.85 MPa were
reported after submersion in the respective solutions of
5% H2SO4, Na2SO4, and NaCl, using wet-dry cycle.
Based on the non-cycle approach, the resulting strength
was 37.36 MPa, 43.05 MPa and 39.52 MPa
Keywords : Geopolymer mortar, durability, acid solution, sulfate solution, chloride solution