Technical viability of construction and demolition waste reuse in paving blocks industrial production: an experimental study. (6th April 2022)

• Record Type: Journal Article
• Authors: Leal, Cleber E.F.; Neto, José C. Marques; Parsekian, Guilherme A.; Christoforo, André L.; Ferreira, Fernanda G.S.
• Is Part Of: International journal of masonry research and innovation. Volume 7:Number 4(2022)
• Page Start: 343
• Page End: 365
• Publication Date: 2022-04-06
• Subjects: construction and demolition waste -- CDW -- recycled aggregate -- concrete paving block -- CPB -- industrial production -- physical properties -- mechanical properties; Masonry -- Periodicals; Masonry -- Mechanical properties -- Periodicals; Masonry -- Testing -- Periodicals; 620.1305
• Languages: English
• ISSNs: 2056-9459

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.