EFFECT OF GGBFS BASED CEMENTETIOUS MATERIAL BY PARTIAL REPLACEMENT OF FLY ASH AND SILICA FUME WITH ALKALINE SOLUTION

Civil Engineering

Pozzolanic material is successively replaced in certain percentage with cement and it also totally replaced by geopolymerization. Thus it is a need to develop sustainable alternatives to conventional concrete utilizing more eco-friendly materials. Geopolymer cements are innovative binders which can be produced by the chemical action of aluminosilicate materials are available worldwide. They are rich in silica and alumina reacting with alkaline solution and producing aluminosilicate gel that acts as the binding material for the concrete. Geopolymers are synthesized by polycondensation reaction of geopolymer binder and alkali polysilicates. So cement is totally replaced by pozzolanic material that is rich in silica and alumina like Flyash, Ground granulated blast furnace slag (GGBFS),Silica fume (SF),Metakeoline etc. can be possible. But this material canot be used directly alternative of cement because percentage of chemical composition of cement is different than waste. The main components of blast furnace slag are CaO (30-55%), SiO2 (22-36%), Al2O3 (6-22%), and MgO (1-18%). In general increasing the CaO content of the slag results in raised slag basicaly and an increase in compressive strength. The MgO and Al2O3 content show the same trend up to 10-12% and 14%, respectively beyond which no further improvement can be obtained. Hence in pozzolanic material cementing power is developed with the help of sodium hydroxide mixed in sodium silicate. The laboratory investigations under ambient and oven dry curing conditions suggested that waste from iron or steel production i.e GGBS is suitable for development of geopolymer concrete; and the compressive strength of geo-polymer concrete is a function of mass ratio of alkaline liquid to GGBS, mass ratio of sodium silicate to sodium hydroxide and molar concentration of sodium hydroxide. The fixed ratio of sodium silicate to sodium hydroxide is 1.0 but the concentration of sodium hydroxide is varied from 6M to 14M and to get the greatest compressive strength from different concentration of NaOH. Activated liquid to GGBFS ratio is 0.32 by mass was maintained constant on the basis of maximum compressive strength of GGBFS with 12M NaOH and alkaline ratio is 1.The temperature of oven heating was maintained at 60, 80 ,90 ,100,120,140 °C for fixed 7 hours duration and tested 7 ,28,and 56 days after heating.

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