O.C.O’s Manufactured LimeStone helps cut carbon in cycle path project
negative aggregates from O.C.O Technology have been used for the first time as
part of a groundbreaking asphalt mix that can significantly reduce the carbon
footprint of surfacing works.
The O.C.O Manufactured
LimeStone (M-LS) is one of the key components in a low carbon cycle path being
built for Birmingham City Council as part of the Bromford Flood Alleviation
Scheme, a project currently under construction by Jackson Civil Engineering for
the Environment Agency.
show the new low carbon foamed asphalt path, made from recycled aggregates and
processed waste products, could bring CO2 savings of up to 90%
compared with using a traditional hot AC20 asphalt mix.
Part of a trial
scheme, phase I of the 2.5km cycle path has been built and work on the
remainder is expected to start in June. It is projected that up to 70 tonnes of
CO2 could be saved on its entire construction.
O.C.O’s Technical Director, said: “We are delighted Jacksons gave us the
opportunity to use our M-LS for the very first time in a foamed asphalt
application. As well as complying with
the technical specification for use in asphalt, M-LS contributes to a reduction
in carbon footprint for paving projects.
“We already supply into the block
manufacturing sector and, because the manufacturing process enables us to create
aggregate with different specifications for different applications. we believe it will become the aggregate of choice in the
“With Zero Carbon being a
global target, the construction industry must source alternative, more
sustainable products, to not only reduce the
carbon footprint but to preserve the finite
reserves of natural aggregate in the UK.”
O.C.O was one of a
number of supply chain partners who contributed to the project.
chain manager Andy Lusher said: “The cycle path provided an opportunity
to look at the original design and ask ourselves how we could do this in a more
carbon-friendly way. We brought our supply chain together to use their
expertise and come up with a solution that was truly innovative.”
believes that the success of this trial means Jackson can be confident in
specifying low-carbon concrete and asphalt in future projects.
He said: “We’ve
learnt lots of lessons from this trial and we know we can do something that
pushes the boundaries but only with the full support and buy-in from our supply
created by treating Air Pollution
Control residues (APCr) from the Energy from Waste (EfW) sector with waste carbon dioxide gas. Because more CO2
is permanently captured than is used in the manufacturing process M-LS has been recognised as the
world’s first carbon negative aggregate.
In 2011, O.C.O was
granted End of Waste (EoW) approval from the Environment Agency – the first
time any company in Europe had achieved such an accolade for an APCr waste
stream and securing the aggregate’s position as a perfect example of the
circular economy in action.