Activation of Nanoparticle and Alkaline Environment on Fly Ash Geopolymer Mortar

The goal of this study is to evaluate the influences of nanoparticles on the mechanical property of fly ash geopolymer mortars. The nano-silica (NS) and nano-alumina (NA) were added to geopolymer mortar with a various amount of nanoparticle-to-fly ash in range from 5 to 25% by weight, respectively. In this research, the different NS/NA ratios in range from 0.5 to 2, by weight, were investigated. For the geopolymerization process, the alkaline solutions (AS) including sodium hydroxide (SH) and sodium silicate solution (SS) were mixed with the SH/SS ratio of 1, by weight. The different ratios of alkaline liquid to fly ash in range from 0.4 to 0.6, by weight, were investigated. The results were focused on the geopolymerization between nanoparticles and alumino-silicate resource by strength in ambient temperature condition. The compressive strength of geopolymer mortar can be up to 22.62 MPa. The suitable mix proportion can be obtained by amount of 5% nanoparticle by fly ash weight, a ratio of NS/NA as 0.5, and ratio of AS/FA as 0.5, by weight, respectively.