PROPERTIES OF SELF COMPACTING CONCRETE WITH METAKAOLIN REPLACING SAND WITH GBFS

S. Shrihari, Seshagiri Rao M.V

Abstract: After Agriculture Industry in India. Construction sector contribute 11% to the GDP. Hence construction Industry plays a crucial role in economic development for any construction. Sand is the major material for preparation of mortar and self compacting concrete. But the problem here is sand is largest basic consumer non-renewable resource. Hence it is our responsibility to safeguard the sand for future generation. Today this is an almost scarcity of national sand and due to continuous excavation of river beds there is some serious effect on ecology ever. It’s the time to think for alternate material to replace the river sand and for any mix design of self compacting concrete higher %age of powder content & sand is required. In the present paper we have put an effort to replace the sand with GBFS by–product of steel and iron manufacturing plant. Test result of GBFS meets the national standard of fine aggregates (IS 38 3 - 1970) GBFS does not contain material that may affect the strength and durability of concrete such as chlorides, organics impurities. It is free from emission of Co2. In the present paper M40 grade of SCC was considered with different replacement of sand with G.B.F.S. Further it is studied that the effect of MetaKaolin on the properties of GBFS self compacting concrete, the studies include the effect of GBFS and MetaKaolin on the fresh and hardened mechanical properties of SCC made with GBFS and MetaKaolin. The observation made that river sand can be replaced up to 60% with constant W/C ratio 0.38% the only problem with GBFS, it takes long time to gain strength. If we add the admixtures METAKAOLIN by 10%, then quick setting & early strength is possible. The GBFS is free from Co2, Alkalis and silt, Co2.The fresh properties & compressive strength of SCC increases with the increase in the percentage of GBFS. But limited to 60% replacement provided by adding 10% MetaKaolin. It is found that 70% replacement not reached satisfactory results. It is economical when compared with natural sand and also reliable alternative material in terms of workability, strength and durability. As there is broader slope for advancement in construction Industry. Therefore there is an immense necessity to know for alternative to natural river sand, this paper further detail about the fresh and hardened properties chemical properties briefly in full length submission. The fresh properties and compressive strength of self compacting concrete is improved as percentage of GBFS increases with constant MetaKaolin (%). The study has revealed that using MetaKaolin in the replacement f river sand with GBFS gives better flow properties and compressive strength in comparison to only GBFS

Keywords: Super Plasticizer, Viscosity Modify agent, MetaKaolin, Fine aggregate replacement, Granulated Blast Furnace Slag

DOI: https://doi.org/10.15623/ijret.2015.0425038