A Comparative Study of Metakaolin/Slag-Based Geopolymer Mortars Incorporating Natural and Recycled Sands

Great efforts are being made to minimize the negative impact of Portland cement industry on environment by using industrial by-products during manufacture clinker or partial replacement preparation concrete. However, carbon footprint remains relatively high in addition large consumption natural resources such as sand and other aggregates. A solution these problems is completely replace with a new generation mineral binders, commonly known geopolymers, which have properties similar those cement. These binders can be obtained alkali-activation siliceous aluminosilicate materials. This study aims develop pozzolanic type at room temperature (20°C) from materials based metakaolin blast furnace slag different percentages. Different activators were employed, including solid (NaOH) liquid (Na2SiO3.nH2O). The optimal mixtures used for making mortars (NS) concrete recycled (CRS). comparative experimental physical, mechanical, microstructural characteristics two types was conducted. Cement amount an association sodium hydroxide silicate gave best physico-mechanical properties. drop compressive strength prepared CRS observed after 365 days, but it still higher than NS. results show possibility designing eco-friendly CRS-based geopolymer mortar that more resistant NS-based homogeneous integrated microstructure. Doi: 10.28991/CEJ-2022-08-08-07 Full Text: PDF