Reuse of waste bricks: a new generation of geopolymer bricks

Abstract

Abstract: In this study, the potential for reuse of waste brick (WB) by alkaline activation in a new geopolymer brick was examined. The effect of the incorporation of ground granulate blast furnace slag (GGBFS), the molarity of sodium hydroxide (NaOH) and the silicate to sodium hydroxide ratio (Na2SiO3/NaOH) on the mechanical properties of the final product was investigated. The manufacturing of geopolymer bricks was carried out by mixing WBs, GGBFS, sand with a solution of hydroxide and sodium silicate. The samples were prepared according to different formulations. The optimal compressive strength obtained is 89.91 MPa, for a GGBFS/WB ratio of 80/20, an 8 M molarity of NaOH and a silicate/hydroxide ratio of 2/1. This study shows an effective feasibility for the recovery and recycling of industrial waste into a valuable product for the construction sector. This recycling method can bring environmental and economic benefits by using it as an alternative material to fired brick in construction. Given the results obtained, it will be interesting to study the environmental and economic impact as well as the durability properties of these geopolymer bricks. Graphical abstract: [Figure not available: see fulltext.].