The Environment Agency (EA) and civil engineering firm Jackson Civil Engineering are working to identify potential new uses for the carbon negative aggregates produced by Carbon8 Aggregates (C8A).
It follows a recent visit to C8A’s Avonmouth facility by the EA’s head of sustainable business, Simon Dawes, innovation manager Andy Powell, and supplier relationship manager Steve Nicholls.
During the visit, they were joined by Steve Livingstone and Andy Lusher from Jackson Civil Engineering.
C8A’s Accelerated Carbonation Technology (ACT) process uses waste carbon dioxide gas to treat APCr from Energy from Waste plants and creates an artificial limestone aggregate (C8Agg). Currently, this is predominantly used in the manufacture of lightweight concrete masonry blocks for the construction industry.
As C8A’s David Olley explains, the goal now is to diversify the range of applications where the aggregate can be used.
“Our carbon negative aggregates offer a much greener and carbon friendly alternative to traditional construction materials,” he said. “While we have successfully made inroads with block manufacturers, we also believe the aggregate has a great deal to contribute by bringing its sustainability credentials to the civil engineering sector.
“We have been talking to Jackson Civil Engineering about potential applications, for example, using C8Agg as a sub-base or pipe bedding. Now, following the very positive feedback from the recent visit by both the EA and Jackson, we are confident we will soon move forward to using C8Agg within some of the country’s major infrastructure projects.”
The artificial limestone aggregate pellets are created by treating thermal waste residues (incinerator ash) with CO2. During the process, the carbonated material is blended with binders and fillers and then pelletised to form the rounded C8Agg.
Because more carbon dioxide is captured within the aggregate than is used in the manufacturing process, C8Agg is the world’s first carbon negative aggregate.
Steven Nicholls, from the EA, said: “We were very impressed with both Carbon8 Aggregates’ processes and technology, and also the sustainability elements embedded within its carbon negative aggregate product.
“We are always very keen to work with industry to embrace new ideas and we are actively working with both C8A and Jackson Civil Engineering to identify potential locations where the aggregate may be used.”
Jackson’s Andy Lusher, added: “Seeing the ACT process first-hand was very informative and has given us plenty of food for thought in terms of the potential new applications for the aggregate. As an engineering business we are very conscious of the need to continually improve sustainability of the projects we work on we were very impressed by the C8Agg’s credentials.”