Geopolymer Effects on Brick using Different Molarity

Geopolymer requires an alkaline to induce it pozzolanic property and to accelerate the Geopolymerization process. The Geopolymerization process occurs due to the mixing of fly ash, sodium silicate and sodium hydroxide as the alkaline activator is used. The purpose of the present study is to investigate the behaviour of fly ash based Geopolymers bricks and to study its durability. In this work main focus is on use of cement by replacing fly ash for making geopolymer bricks. The bricks were cast with proportion of fly ash to sand 1:3. The ratio of fly ash to alkali solution is used 2 and sodium silicate to sodium hydroxide is 2.5.The bricks were casted size of 230mmX110mmX90mm. The alkaline solution was prepared using sodium hydroxide and sodium silicate mix together for 24 hours with different type of molarities such as 6M, 8M, 10M, 12M, 14M, 16M.The specimens were cured at constant oven temperature at 80oC for 48 hours. It is observed that the geopolymer bricks give maximum compressive strength as compared to country bricks and fly ash bricks. In geopolymer bricks the maximum compressive strength is gain for brick casted with 10 Molarity.