Technical viability of construction and demolition waste reuse in paving blocks industrial production: an experimental study
by Cleber E.F. Leal; José C. Marques Neto; Guilherme A. Parsekian; André L. Christoforo; Fernanda G.S. Ferreira
International Journal of Masonry Research and Innovation (IJMRI), Vol. 7, No. 4, 2022

Abstract: This research aimed at evaluating the partial replacement of the regular sand with a recycled sand from concrete and mortar waste to produce concrete paving blocks (CPB), as a strategy to reduce waste disposal and save natural resources. The recycled aggregate was collected at a municipal construction and demolition waste (CDW) recycling plant. Its physical properties were evaluated and compared with those from regular non-recycled aggregates. The units were manufactured in an industry plant, with 0%, 10%, 20% and 30% aggregate replacement ratios and same cement content. Compressive strength, tensile splitting strength, abrasion resistance and water absorption were determined at 7 and 28 days. As a result, the statistical analysis showed no differences among mechanical properties from the reference mix (0%) and other replacement ratios. All mixes met abrasion limits and showed satisfactory water absorption. In conclusion, the natural sand replacement up to 30% is technically viable for CPB scale-up production.

Online publication date: Fri, 01-Jul-2022

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