Development of geopolymer mortar made from bagasse ash with waste aluminum

Abstract

Geopolymer concrete is a type of concrete that is produced using industrial waste materials such as fly ash, slag, and other similar materials instead of traditional Portland cement. This research studied the variables affecting geopolymer mortar from bagasse ash mixed with aluminum scraps. The waste materials, bagasse ash (BA) and aluminium scrap (AL) were crushed to reduce the particles by grinding. An amount of ALU 0.01 – 0.15 wt% bagasse (BA) ash was added to the mixture. The alkaline solutions (AS) used to leach silicon oxide and aluminium oxide from BA were sodium hydroxide (NH) and sodium silicate (NS). The concentration of NH solution was varied between 7.5 – 15 molar. The ratio of alkaline solution to bagasse ash (AS/BA) was controlled at 0.50. Mortar samples were cast and cured at 60 80 and 100 °C for 48 hours. The results showed that the 10-molar sodium hydroxide solution tended to support the higher compressive strength. The highest compressive strength of geopolymer was found when using 0.04% aluminum scrap and curing at 80 °C. The additional water improved the workability of the fresh mortar, but the lower strength of the geopolymers was archived. GRAPHICAL ABSTRACT HIGHLIGHTS Do not use as a cementitious binder Reuse waste materials It is an environmentally friendly and sustainable material