Dry-cast concrete blocks are a popular building material because masonry allows for quick, efficient, durable and economic construction. To improve the economic and environmental sustainability of this industry, its dependence on raw materials needs to be reduced. This can be achieved by replacing a portion of the sand with high density polyethylene (HDPE) or low density polyethylene (LDPE) or a portion of the cement with waste glass powder (WGP). In this study, blocks were produced in an industrial plant with up to 15% of the sand replaced with polyethylene pellets and up to 25% of the cement substituted with WGP. The physical, mechanical and durability properties of the individual blocks and the mechanical properties of the block assemblages were tested. Experimental results revealed that blocks with 10% WGP as cement replacement performed similarly to the control blocks and that blocks containing either LDPE or HDPE resulted in a decrease in strength and an increase in water absorption. Acceptable performance was achieved when 3 to 6% of the sand was substituted with polymer pellets.
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