Effects of Metakaolin on Fly Ash-Ggbs Based G...

Effects of Metakaolin on Fly Ash-Ggbs Based Geopolymer Concrete with Partial Replacement of Fine Aggregate with Quartz Sand

Author Name : S. Shagufta Naveed, P. Eswanth, M. Deepak, P. Manoj Kumar

ABSTRACT

Geopolymer is a new generation binder material which forms an eco-friendly alternative for the conventional Portland cement, to reduce the greenhouse effect thereby global warming. Geopolymer concrete is prepared by geopolymerization of alkaline solution with binder materials of fly ash and GGBS. This paper deals with the end results of quartz sand on mechanical properties of metakaolin on fly ash-GGBS based geopolymer concrete. Sodium silicate (Na₂SiO₃) and sodium hydroxide (NaOH) are used as alkaline activators. The molarity of NaOH is 10M. The ratio of Na₂SiO₃ and NaOH is 2.5. The samples were prepared and cured at ambient temperature. Further study is done in the above GPC mix by replacing fly ash with metakaolin at different percentages i.e., 5%, 10%, 15% and fine aggregate is partially replaced with quartz sand at different percentages i.e., 0%, 10%, 20% in the mixes. Properties (mechanical, durability) of geopolymer concrete with quartz sand were studied and compared with conventional GPC. It was found that the optimum replacement of metakaolin for fly ash was 10% and quartz sand for fine aggregate was 10% corresponding to maximum strength properties.

Keywords: Geopolymer concrete, Fly Ash, GGBS, Metakaolin, Quartz sand, Alkaline activators, Mechanical Properties, Durability Properties