Resumen

RUA-PATINO, ROBINSON; OSPINA-CORREA, JUAN  y  CAMPILLO-MACHADO, FRANCISCO. Mechanical Behavior of Concretes with Total Replacement of Natural Coarse Aggregate from Construction and Demolition Waste. Ing. Desarro. [online]. 2025, vol.43, n.2, pp.238-255.  Epub 01-Jul-2025. ISSN 0122-3461.  https://doi.org/10.14482/inde.43.02.777.362.

The reuse of construction and demolition waste (CDW) in concrete has been widely researched, but concerns remain regarding its impact on mechanical performance. This study investigates the compressive strength of concrete made with recycled coarse aggregates. The mixtures were designed according to ACI-211.1-91, completely replacing natural coarse aggregate with CDW, using a 3:1 ratio of brick to recycled concrete, in sizes of 3/8" and 1". Various water-cement ratios (0.5 - 0.6 - 0.7) were evaluated. The results indicate that the 3:1 ratio with a 3/8" size and a water-cement ratio of 0.5 improves compressive strength by 33% compared to previous studies. This increase in strength suggests that the use of CDW can produce concrete suitable for structural elements, contributing to the development of more sustainable concrete without compromising mechanical performance. The findings of this study open new possibilities for using concrete with 100% replacement of natural aggregates by CDW while maintaining functional compressive mechanical performance.

Palabras clave : compression stress; light concrete; recycled coarse aggregates; recycled concrete; total replacement of aggregates.

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