Permanently locking down CO2 into Concrete

Concrete4Change is developing novel technology for carbon sequestration within concrete, helping concrete manufacturers and the construction industry achieve net-zero.

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C4C Process

How the Technology Works and its Impact

The technology

Mineralising CO2 into Concrete

The innovation underpinning Concrete4Change is to engineer a concrete additive material that acts as a carrier for CO2. The process can be broken down into four steps as below.


Recycled waste

Recycled waste

Utilise Recycled Waste Materials for the Carrier

Our carrier is derived from waste streams, turning waste into value and promoting a circular approach. Examples include, recycled wood waste, glass waste, ceramic waste and plastic waste


Carrier Preparation

Carrier Preparation

Carrier Preparation

The precursor material for the carrier is prepared in order to become an ‘adsorbent’, that is able to capture and release CO2 for optimal carbonation of concrete.

Carrier preparation

Load CO2 into Carrier

Load CO2 into Carrier

Load CO2 into Carrier

The carrier is loaded with CO2 via the C4C process unit. Any source of CO2 can be used. For the benefit of circularity, flue gas from cement production is the main feedstock.


Mix With Concrete

Mix With Concrete

Mix with concrete

The loaded carrier is mixed with concrete (wet or dry). The carrier will then slowly release CO2 inside concrete for permanent mineralisation, increasing concrete strength, thereby reducing the amount of cement needed.

Concrete mixer
Want to find out just how much difference you can make?
CO2 Calculator
The technology
Turning an emission problem into an emission solution
Greener - CO2 mineralised + avoided cement usage
Potential cost reduction from production price of concrete -
less cement & carbon offsetting
C4C technology is easy to implement, as the carrier can simply be added uniformly to the concrete mix along with the other components of concrete, with no change to production lines, further reducing cost compared with alternative approaches.

The carrier is injected with CO2 captured from industry, with a particular focus on flue gas generated from cement production – providing a cost-effective route to CO2 utilisation.

C4C’s technology is aiming to increase the strength of concrete, therefore reducing the amount of cement required for a given strength of concrete, saving cost, and saving further CO2 emissions associated with cement manufacturing.  
The Benefits

Novel carrier methodology can be integrated with industry standard processes – no change in concrete production line is required

Any source of CO2 can be used (Flue gas and purified CO2)

Carrier made from waste materials to minimise the carbon footprint

Applicable to all types of cement and concrete including pre-cast and ready-mix concrete

10x more CO2 sequestration than existing approaches for ready-mix concrete

Production cost of concrete using our technology is significantly cheaper than conventional concrete

Globally implementable

Find how much you could save
CO2 Savings Calculator
Our calculator assumes a typical concrete mix consisting of 350kg of cement per cubic metre with an embodied carbon profile 280kg per cubic metre. This calculator provides an indicative saving figure. For a personalised calculation, please get in touch via the partnership page or contact page.
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Total emission saving (in tonnes) - CO2 mineralised + avoided cement usage
Concrete cost without C4C in GBP
Concrete cost with C4C in GBP
Money is saved due to reduction in cementitious material and carbon offsetting
Number of trees that would have to be planted and replanted for thousands of years to remove the same amount of CO2
Click here to see a breakdown of a typical emission profile and how much embodied carbon can be removed using our technology.
Typical Concrete vs C4C Concrete

Adjust the numbers in the table to reflect your mix design and see how much carbon you can potentially remove with C4C technology

Cementitious material
Concrete CO2 emission per m3
C4C Concrete CO2 emission per m3
(kg per 1m3 concrete)
CO2 emission (kg CO2 per tonne)
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Road map to net-zero concrete
Path to scale
Laboratory scale development
Iterative development and testing of the carrier material prototypes, plus small-scale lab trials with selected partners. Develop strong relationships with key industry stakeholders in the UK and EU.
Pilot trials
Scaling up the carrier materials from the lab environment to pilot trials with some of the world's largest and most prestigious concrete manufacturers.
Scaling up production
Working with production partners to set-up the supply chain for initial customer sites, conduct further industrial trials in concrete and complete regulatory approval pathway.
Full Licensing Agreements
Transition to full licensing agreements with the network of UK and EU based customers.
Global Expansion
Expand to targeting concrete manufacturers in territories outside of the UK and EU.

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