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Concrete Based on Recycled Aggregates for Their Use in Construction: Case of Goma (DRC)

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Document pages: 13 pages

Abstract: The following study is aimed at valorizing an important part of wastefrom building demolition, particularly concrete as a source of aggregates fortheir usage in new hydraulic concreteformulation. The experimental study mainly consisted of physicalcharacterization of natural and recycled aggregates respectively and the impactof the latter on some properties of the new formulated concrete, actually theirrespective consistencies for fresh concrete and mechanical strength for thehardened one. The outcome of the study shows that the recycled aggregates are moreheterogeneous and have a high capacity of water absorption, but which stillrespects the current standards of concrete. Theneed for additional water has been observed for recycled aggregates-basedconcrete so as to have the same workability. About the compressive strength,mechanical properties obviously show that, at 28 days from setting up,concretes from recycled aggregates can reach compressive strengths rangebetween 20 and 25 MPa without any sophisticated technology. So, these results show that we canefficiently contribute to the protection of environment by valorizing wastefrom concrete-based building demolition on the one hand; and the preservationof natural reserve on the other. And both advantages contribute to sustainabledevelopment overall goals.

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