Valorizing hazardous lead glass sludge and alumina flakes filling waste for the synthesis of geopolymer building bricks.

Geopolymer bricks from lead glass sludge (LGS) and alumina flakes filling (AFF) waste were synthesized in the present work. AFF waste was chemically treated to prepare sodium aluminate (NaAlO) powder. Silicate source (untreated LGS and thermally treated one at 600 °C (LGS600)) and sodium oxide (NaO) concentration (as NaAlO) were the compositional parameters, which affected the physical and mechanical properties (compressive strength, water absorption, and bulk density) of the prepared bricks.