The Strength of Bottom Ash-Based Geopolymer Brick with Inclusion of Fly Ash

This paper studies the finding of compressive strength of bricks using bottom ash as a geopolymer raw material added with several percentages of fly ash, which act as a filler, besides can give better performance of strength to the bricks according to the chemical composition and the reaction of all the geopolymer materials. The study has been conducted to produce bottom ash-based geopolymer bricks by varying the percentage of fly ash added (20%, 40%, 60%, 80%) to the bottom ash-based geopolymer bricks in the mixing process. The compressive strength up to 13.69 MPa was obtained, the density is low at 20 % of fly ash added into the mixing and the water absorption is lower with the higher fly ash added using 70°C curing temperature within 24 hours at 7 days of ageing.