Development Of Geopolymer Mortar Using Ternarry Binders
The huge demand for concrete due to industrialization and urbanization has resulted in the depletion of natural resources, and, hence, this research focuses on alternative materials, including the utilization of waste materials as a replacement for binders and conventional aggregates. The investigation concerns the use of the optimum mix proportion of two locally available pozzolanic waste materials, namely, ground granulated blast furnace slag (GGBS) and palm oil fuel ash (POFA) together with metakaolin (MK) as binders. In addition, another local waste material, manufactured sand (M-sand) from the quarry industry was used as a replacement for conventional sand in the development of green geopolymer mortar. Eight mortar mixtures were designed with varying binder contents. The binder/fine aggregate, water/binder and alkaline activator/binder ratios were kept constant. The oven dry curing was also kept consistent for all the mix proportions at a temperature of 650C for 24 hours. This paper mainly investigated the mortar density and compressive strength. The research outcome revealed that the highest 28-day compressive strength of about 48MPa was obtained for the mortar containing 20% of MK, 35% of GGBS and 45% of POFA. The increment of MK beyond 20% leads to reduction the compressive strength. The density decreased with the increase of POFA percentage because of its agglomerated, crushed shape and increasing inter-particle friction need more water in mixes to obtain a workable mix.
Keywords- Metakaolin; Ground Granulated Blast Furnace Slag; Palm Oil Fuel Ash; Manufactured Sand; Alkaline Activators; Geopolymer Mortar; Compressive Strength.