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Mechanical recycling of EOL concrete into high-grade aggregates

Author

Listed:
  • Lotfi, Somayeh
  • Deja, Jan
  • Rem, Peter
  • Mróz, Radosław
  • van Roekel, Eric
  • van der Stelt, Hans

Abstract

Recycling End of Life (EOL) concrete into high-grade aggregate for new concrete is a challenging prospect for the building sector because of the competing constraints of low recycling process cost and high aggregate product quality. A further complicating factor is that, from the perspective of the environment, there is a strong societal drive to reduce bulk transport of building materials in urban environments, and to apply more in situ recycling technologies for Construction & Demolition Waste. The European C2CA project investigates a combination of smart demolition, grinding of the crushed concrete in an autogenous mill to increase the liberation of cement mortar from the surface of aggregates and a novel dry classification technology called ADR to remove the fines. The feasibility of this recycling process was examined in a demonstration project involving 20,000tons of EOL concrete from two office towers in Groningen, the Netherlands. Results show that the +4mm recycled aggregate compares favorably with natural aggregate in terms of workability and the compressive strength of the new concrete, showing 30% higher strength after 7 days.

Suggested Citation

  • Lotfi, Somayeh & Deja, Jan & Rem, Peter & Mróz, Radosław & van Roekel, Eric & van der Stelt, Hans, 2014. "Mechanical recycling of EOL concrete into high-grade aggregates," Resources, Conservation & Recycling, Elsevier, vol. 87(C), pages 117-125.
    • Handle: RePEc:eee:recore:v:87:y:2014:i:c:p:117-125
    DOI: 10.1016/j.resconrec.2014.03.010
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    References listed on IDEAS

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    1. Tam, Vivian W.Y. & Tam, C.M. & Le, K.N., 2007. "Removal of cement mortar remains from recycled aggregate using pre-soaking approaches," Resources, Conservation & Recycling, Elsevier, vol. 50(1), pages 82-101.
    2. Vefago, Luiz H. Maccarini & Avellaneda, Jaume, 2013. "Recycling concepts and the index of recyclability for building materials," Resources, Conservation & Recycling, Elsevier, vol. 72(C), pages 127-135.
    3. Rao, Akash & Jha, Kumar N. & Misra, Sudhir, 2007. "Use of aggregates from recycled construction and demolition waste in concrete," Resources, Conservation & Recycling, Elsevier, vol. 50(1), pages 71-81.
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