Mechanical recycling of EOL concrete into high-grade aggregates

Somayeh Lotfi, Jan Deja, Peter Rem, Radosław Mróz, Eric van Roekel and Hans van der Stelt

Resources, Conservation & Recycling, 2014, vol. 87, issue C, 117-125

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.

Keywords: Concrete recycling; Recycled aggregate; Advanced dry recovery (ADR) (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:eee:recore:v:87:y:2014:i:c:p:117-125

DOI: 10.1016/j.resconrec.2014.03.010

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