The Effect of Alkaline Activator Components on the Properties of Fly Ash Added Pumice Based Geopolymer

The effect of sodium hydroxide (SH) concentration and silicate (SS) content in alkali activator on mechanical properties wet-dry resistance fly ash added pumice based geopolymer paste were investigated. In the study, SH was used as 8, 10, 12 14 molar, while weight ratio SS to 0, 1, 2 3. While density samples increased significantly with increase molarity mixtures low content, it less affected by high content. For all values, compressive strength SS/SH ratio, a slight decrease observed increasing from However, molarity, As large cracks or splits occur activated only under wet-dry, their could not be measured. performance + much close each other. When looking at microstructure studies, FTIR analyzes show that provides better geopolymerization, SEM images micro-cracks relatively