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The characteristics of interlocking blocks made with recycled expanded polystyrene (EPS) foam as a partial substitute for coarse aggregates and Metakaolin in place of fly ash are presented in this study. This is a list of the blocks' properties. In the study, a multi-criteria decision model was also used to find a solution to waste issues and rising building material costs. Pulverized EPS was used to replace coarse aggregates by 10%, 15%, and 20% by volume, respectively. To make the block lighter, metakaolin and EPS foam are used. For comparison, a control specimen was prepared. Laboratory tests were performed to compare the physical and mechanical properties of the proposed interlocking block to those of a conventional concrete hollow block (CHB) in terms of physical and mechanical properties, material cost, and construction time. Finally, a comparison of parameters between the conventional and proposed blocks revealed that the proposed block is superior in terms of material, cost, and construction time.

Partially Replacing EPS Foam and Metakaolin in Interlocking Bricks