Virgin stone replacement from agregates manufactured from hazardous waste and CO2 gas
Technologies that sequestrate CO2 in valorised industrial or mineral waste are not yet financially attractive. However, the developing ‘circular economy’, improved public education, and taxes that encourage the diversion of waste from landfill and place a realistic price on ‘carbon’, will increase industry participation, investment and market capacity.
A uniform regulatory approach within Europe to the management of risk via the ‘end of waste’ option will further foster innovative waste treatments and the beneficial re-use of waste resources.
In the UK, Carbon8 has demonstrated that aggregates manufactured from hazardous waste and CO2 gas can replace virgin stone. The carbon negative aggregates meet the requirements of ‘end of waste’ and are becoming available in significant quantities i.e. >200k tonnes pa by mid 2015. The carbonated aggregate is a key component of the world’s first carbon negative concrete construction block.
The present work overviews the route to commercial success, including regulatory approvals, investment and third-party validation of the carbonated aggregate product. The likely outcomes of the further development and application of accelerated carbonation technology for the production of sustainable construction materials is also presented.