First published in March 2022, the Gold Standard Methodology for Carbon Sequestration through the Accelerated Carbonation of Concrete Aggregate has been applied by the carbon removal organisation @neustark, with the first issuance of certified carbon credits in April 2024.
In general, demolished concrete is collected at Concrete Recycling Facilities (CRF) and crushed into concrete aggregate before it is used as a substitute to gravel and sand in fresh concrete or road construction, or before it is landfilled. This methodology facilitates technology-based CO2 sequestration (carbonation) with biogenic CO2 in demolished concrete (concrete aggregate) before it enters downstream processes.
We are currently consulting on a revised version of the methodology that expands the applicability scope beyond demolition concrete so that it may be applied to the carbonation of a wider range of reactive mineral wastes (e.g. by-products of residual waste from municipal waste treatment). The revisions also account for developments in the field of carbon dioxide removal (CDR) by considering durability and reversal risks, as well as additional safeguards and accounting measures.
