Piloting of recarbonation of demolition concrete fines

Pilot plant for demonstrating alkaline industrial waste recarbonation

Making use of waste CO2 from demolished concrete

ACCSESS will demonstrate a process for using captured CO2 from demolished concrete to replace filling materials in new concrete products in an operational setting (technology readiness level 7).

This technology has been developed by Neustark, and has been validated in a relevant environment. The pilot being developed through ACCSESS will use 220 kg CO2/hour to produce 500 kg calcium carbonate (CaCO3)/hour, which can be used as a filling material.

Currently, sand and other raw materials are used as filling materials in new concrete products. This process can replace these materials by making use of old concrete – the world’s largest waste stream. Furthermore, this process enables CO2 to be permanently stored in new constructions on a smaller scale than storage, for example, under the North Sea. If the CO2 originated from biogenic sources, this process will also contribute to carbon dioxide removal (CDR).
The concept for the NEU technology for concrete recarbonation

In addition to developing its recarbonation technology, Neustark has also developed a system for Carbon Dioxide Removal (CDR) certificates. This knowledge is highly relevant to ACCSESS’ activities and vision, and Neustark has shared its insights with the ACCSESS consortium on how these certificates can be included in business model development.