Workability and Compressive Strength of Geopolymer Mortar Made From High-Calcium Fly Ash Containing Cement and Palm Oil Fuel Ash

Abstract

This article aims to study the workability and compressive strength of geopolymer mortar made from high-calcium fly ash containing cement and palm oil fuel ash. Fly ash was replaced with PC at the rate of 0, 20 and 20% by weight of binder, and Fly ash was replaced with POFA at the rate of 0, 0 and 40% by weight of binder. And Use a waterproofing as an added mixture at the rate of 0, 0.5, 1, 1.5 and 2% by weight of binder. Sodium silicate (Na₂SiO₃) and 10 molar sodium hydroxide (NaOH) solutions were used as the alkaline solution in the reaction. The Na₂SiO₃/NaOH ratio of 1.0 and sand/binder ratio of 0.5and 1.0 and the curing at ambient temperature were used for all of mixtures. The results found that the level replacement of PC increase showed the compressive strength of geopolymer tended to increased. And Fly ash was replaced with Palm oil fuel ash POFA increase showed the setting time of geopolymer tended to increased.