Circular Aggregates – Crushed Concrete Aggregates for Concrete Applications

Concrete waste is utilized in Sweden mostly for backfilling in road applications and building landfills. The techniques for recycling concrete to replace natural aggregates are in place and makes it possible to produce circular and climate reduced concrete. This paper explores concrete crushed aggregates (CCA) from rest concrete, produced using industrial crushing methods. Also, the regulatory framework supporting recycling has been discussed. The Swedish concrete standard is implementing to a lower grade the use of CCA in new concrete in comparison to other European standards specially regarding the use of fine CCA fractions. Results for CCA water absorption and apparent density from lab scale and industrial crushing are shown. The CCA fulfills claims for aggregates for indoor concrete. With further improvements in the crushing process, CCA is fit for applications in outdoor concrete.