Development of Geopolymer Mortars Using Air-Cooled Blast Furnace Slag and Biomass Bottom Ashes as Fine Aggregates

The aim of this study is to compare the mechanical and physical properties different geopolymer mortars made with granulated blast furnace slag as a source material, NaOH (8 M) activating solution, three types fine aggregates (air-cooled slag, biomass bottom ashes, silica sand). samples were an aggregate/geopolymer ratio 3/1, (density mercury intrusion porosimetry), (compressive flexural strength), acid attack resistance determined. When air-cooled used, are improved compared sand ashes because existence amorphous phases in which increase reaction rate despite particle size being higher than other aggregates. It can be highlighted that use ACBFS aggregate produces better cement Portland mortar.