Concrete Archives | UKGBC /focus-areas/concrete/ The voice of our sustainable built environment Mon, 08 Jul 2024 15:26:57 +0000 en-GB hourly 1 /wp-content/uploads/2023/02/cropped-UKGBC-favicon-1.png Concrete Archives | UKGBC /focus-areas/concrete/ 32 32 Eliminating structural concrete overdesign with AI /resources/eliminating-structural-concrete-overdesign-with-ai/ Wed, 29 Mar 2023 14:54:26 +0000 /?post_type=resource&p=40278 Eliminating concrete over-design with AI.

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Problem Addressed

Presently, the concrete industry constitutes 4-8% of global CO2 emissions (). Concrete is the most common material for building structure and there is an overall consensus in the construction industry that concrete structures tend to be over-designed, from various reasons such as lack of optimisation tools, tight design time schedules, lack of engineers or financial motivation to create a lean structure.

All of the above leads to loss of funds for the client, high levels of CO2 emissions and friction between all stakeholders that take part in designing our buildings.

Solution overview

Structure Pal provides structural engineers with AI-based tools that enable them to reduce the required concrete in their design, without changing their workflow and without any learning curve, achieving great reduction in costs, volume and CO2 emissions.

The result in numbers:

  1. Up to 15% concrete volume reduction.
  2. Up to 15% reduction in concrete related execution costs.
  3. Up to 50% design time reduction.
  4. Up to 30% reduction in construction emitted Co2.

Structure Pal works directly on the BIM model and allows users full control of the properties of each project according to the client brief. The software will propose the minimum amount of concrete columns and slab thickness required. It will also determine the most efficient cross sections for the reinforced concrete elements.

Users pay per square metre of floor plan. The use of the software results in reduced reinforced concrete volume, CO2 emissions and construction cost. For every £1 invested in Structure Pal, users receive a £10 return on investment due to savings.

Case study

All the information is currently protected under NDA.

Facts and Figures

Up to 15 %
Up to 15 %
Up to 50 %
Up to 30 %

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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3D printed concrete beams designed to use less material /resources/3d-printed-concrete-beams-designed-to-use-less-material/ Mon, 12 Dec 2022 17:15:18 +0000 /?post_type=resource&p=30127 3D printed concrete beams for construction projects. 

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Problem Addressed

The built environment is directly responsible for 25% of UK emissions, lifting to 42% if you include surface transport. In order to reach Net Zero by 2050, the roadmap for the construction industry, from the , requires a 25% reduction in emissions by 2030, compared to 2020. Sustainable development in 21st century must include concrete solutions but there is no need to wait until 2030 for meaningful reductions in embodied carbon.

Solution Overview

minimass beams are a new type of 3D printed concrete beam, to be used as a prefabricated structural element in new-build construction.

They are designed to use less material – concrete and steel – to achieve the same performance requirements as typical concrete beams. minimass beams can reduce the quantity of concrete by up to 60% and the quantity of steel by up to 50% which also significantly reduces costs, with predictions of up to 50% reduced material costs.

The beams are designed to Eurocodes and can be a like-for-like replacement to traditional concrete, steel or glulam beams, with minimal change to the design of the rest of the structure. The beams use a geometry which responds to the applied loads and they have large web openings which allow services to pass through them.

This is a good solution for beams longer than 6m and an excellent solution for beams longer than 12m. For short beams, e.g. in residential construction, it is likely that steel or shallow concrete beams are more appropriate.

The beams can be used with precast concrete floors, composite metal deck and CLT.

The cost of the solution is split between material costs and manufacturing costs. The material costs are significantly reduced – by up to 50%. The manufacturing cost is driven by the 3D printing process and the location of the project. Crucially, the labour costs associated with 3D printing are low, therefore the overall cost for the beam is of the order of 25% less than a traditional concrete beam.

Case Study

There is no built case study available but the product has passed a range of laboratory tests and is now being marketed to projects in UK, Europe and Australia. Furthermore, a series of 6m long physical prototypes have been printed and assembled for destructive load testing. Working with a range of industry leaders, this testing process has been essential to validate minimass for the construction industry.

Facts and Figures

~25 %
<60 %
<50 %

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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Zero cement concrete /resources/earth-friendly-concrete/ Tue, 15 Nov 2022 09:52:43 +0000 /resources/earth-friendly-concrete/ Low carbon concrete technology to reduce the carbon footprint in the built environment. 

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Problem Addressed

Concrete is an essential building material, but cement remains one of the largest contributors to man-made carbon emissions. The production of cement accounts for 2.8 billion tonnes of CO2 emissions every year, or 4-8 percent of the world’s total man-made CO2 output, according to .

Solution Overview

Earth Friendly Concrete (EFC) is a zero cement concrete proven at scale on construction projects. It can reduce embodied CO2 in concrete by up to 70%, which will significantly help to decarbonise the UK construction sector. It does this by eliminating the need for cement and using its own binder system instead, which also positively impacts the circular economy. EFC ultra-low carbon concrete technology meets and exceeds the performance specifications of ordinary concrete and delivers superior durability. EFC is available for ready-mix and precast concrete production.

Aside from the obvious benefits of eliminating up to 70% of embodied carbon in cement based concrete, it has been proven that early engagement with a project design team can also position EFC as a cost effective alternative to ordinary concrete. This is due to the superior performance and durability of EFC, which enables less concrete and steel reinforcement to be used for many applications.

An independent LCA has been conducted to compare EFC’s cement binder and concrete with typical regional cement blends and this can be found in their .

Case Study

EFC has already been used at scale and more than 80,000 m³ has been poured on construction projects across the world, including trials with major UK organisations such as HS2, National Highways, Network Rail and the Environment Agency.

Case Study: Bentonite Silo Spill (Raft Slab & Walls) @ HS2 Euston – Mace Dragados JV & John F Hunt

Engineering firm John F Hunt, working for HS2’s station construction partner Mace Dragados Joint Venture (JV), completed the 232m3 concrete pour in early September. EFC reduces the amount of carbon embedded into the concrete, saving over 76t of CO2 overall. It was supplied by Capital Concrete and has been used as a foundation slab that will support polymer silos used for future piling works at the north of the Euston Station site. The project was the largest single pour of EFC to date in the UK. While the foundation is temporary, it will be in use for two years, and historically would have been constructed with a more traditional cement-based concrete. This is a step forward in understanding how low carbon concrete can be used more widely in construction going forward.

EFC is made from a combination of ground granulated blast furnace slag, pulverised fly ash and a high-alkaline chemical, rather than Portland cement. Its geopolymer binder system reduces embodied carbon by around 70% saving 250kg of CO2 per cubic metre poured. The pour will help support HS2’s objective of net-zero construction by 2035 and achieve its goal of halving the amount of carbon in the construction of Britain’s new high speed rail line.

Facts and Figures

70 %

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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Cement made from recycled waste /resources/cement-made-from-recycled-waste/ Wed, 21 Sep 2022 15:06:18 +0000 /resources/mevocrete/ Cement made from 97% recycled industrial waste material.

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Problem Addressed

Conventional portland cement is the market leader for concrete production. It is responsible for 8% of global carbon emissions, according to the .

Solution Overview

Mevocrete is a competitively priced, cement made from 97% industrial waste. It reduces the impact of typical construction materials by clearing brown sites, reducing the need for landfills and creating a more efficient process for using industrial waste, both legacy and current.

Material Evolution needs to build automated production facilities to allow for greater production capacity in order to provide a viable competitor to ordinary portland cement.

Upfront costs are estimated at being at least £500,000 but this will be offset by low operating costs, as the manufacturing process requires very low energy consumption. A new facility will also create jobs in the local vicinity and boost local businesses.

Currently, it has a batch production facility that can produce 96 tonnes a day.

Case Study

Material Evolution has conducted several industrial trials with the largest pre-caster in Europe, which have demonstrated repeatability and viability at scale.

Facts and Figures

£500,000
97 %

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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3D printing optimised structures using less concrete /resources/3d-printing-optimised-structures-using-less-concrete/ Mon, 08 Aug 2022 09:46:06 +0000 /resources/revolutionizing-concrete-construction/ Optimising waste recycling into sustainable, 3D-printed concrete. 

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Problem Addressed

In the built environment, cement use is the cause of 8% of global CO2 emissions every year, according to the . Construction companies face the challenge of virgin material over-consumption, whilst industrial companies endure high storage costs and high risk environments from the generation of large quantities of waste.

Solution Overview

Hyperion Robotics combines large-scale, 3D printing with low-carbon concrete made of industrial waste materials such as mining tailings, ashes, slags and demolition waste. Their variety of sustainable infrastructure products include foundations, water tanks, trenches and buildings. They have developed a special construction material based mainly of mining tailings that uses zero cement. Accompanying this, their software enables optimized structural designs for 3D printing, resulting in minimal material usage. Clients can choose to use traditional cement-based concrete with the technology or low-carbon concrete made from local recycled materials.

The system has low power requirements at approximately 15kw/hr, though it may vary per project. Due to the decreased use of cement and virgin aggregates, embodied carbon is reduced, lead time is reduced by 50%, and the need for tailing storage facilities is lessened, limiting health and safety risks. Accompanying this, Hyperion Robotics also provides training, support and maintenance services.

Hyperion Robotics provides different options to allow customers to more easily adopt their technology – either an initial investment (£150k to £500k depending on the complexity of the systems) or through leasing it for a project / a certain period of time. Clients can expect an ROI in 12 months or less when Hyperion Robotics’ micro-factories are at full production, with 30% in financial savings due to the decreased use of cement and virgin aggregates. Their models and technology allow clients to easily scale up their production and execute projects that otherwise they would have not been able to deliver with traditional technology.

Case Study

Hyperion Robotics designed and produced 2 x 2 m water tanks for the mining industry made with almost 99% recycled mining tailings and zero cement.

Metso Outotec develops mineral processing plants for mining and industrial companies that allow the drying of mining tailings on a very large scale. Once the tailings are processed, Hyperion Robotics’ solution is used to complement Metso’s technology, allowing the use of a high percentage of this waste as a component in their concrete. The concrete has been used to produce sustainable infrastructure products for the mining company itself, but also for the surrounding communities. They are currently looking into building similar tanks with 10 x 10 m dimensions.

Facts and Figures

12 Months
50 %

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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Sensors and AI to predict concrete curing time /resources/concrete-dna/ Tue, 19 Jul 2022 15:05:54 +0000 /resources/concrete-dna/ A construction intelligence platform for carbon and time savings when working with concrete.

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Problem Addressed

Concrete is a construction resource requiring significant decarbonisation in the race to Net-Zero. Contractors often operate in the blind in terms of concrete maturity, due to antiquated testing methods. As such, concrete is often over-performant in order to increase safety margins, resulting in high embodied carbon mixes. Additionally, novel low carbon concrete chemistries are often more complicated to work with and traditional strength testing methodologies make them unfeasible at scale.

Solution Overview

ConcreteDNA is a construction intelligence platform that allows contractors to build more efficiently, safely, and sustainably. The flagship concrete module is powered by a fully wireless and embeddable sensor that measures and transmits the compressive strength of the pour in real-time to the platform. Paired with an artificial intelligence feature that is able to predict the curing time of a given mix, contractors are able to plan ahead and strike concrete formwork that lies on the critical path precisely when it is safe to, rather than waiting on slow test cube lab reports.

By scientifically determining the compressive strength of concrete in real-time, contractors can choose a concrete mix that is only as performant as they need, allowing them to significantly reduce the cement content and be more responsive with design mixes. Thanks to these insights, ConcreteDNA currently helps contractors build up to 30% faster.

Converge promotes the use of low carbon concretes and alternatives, by validating their in-situ performance scientifically, and providing real-time intelligence to allow field teams to take proactive mitigating measures to ensure quality.

Converge customers can see anywhere between 3-22x ROI on the solution, with optimal results going to customers that are structured to act on the real-time data, and strike formwork as soon as the system shows that the concrete has reached critical strength.

Further benefits

  • By allowing contractors to strike concrete formwork at the soonest safest moment, Converge allows contractors to build up top 30% faster. Finishing a project sooner means that diesel generators are running less.
  • Thermal differential monitoring helps mitigate thermal cracking, meaning less rework and less waste.
  • Wireless and embedded sensors provide a non-destructive method of testing concrete which results in less wasted concrete through testing cubes (or cylinders).

Case Study

St Johns Manchester Good Yard

The site

Manchester Goods Yard is the creative and professional hub of the £1bn St John’s quarter development with 30,000m2 of floor space, across nine floors, dedicated to offices, co-working spaces and retail. Careys were subcontracted to Leandlease to construct the frame which featured a PT slab design.

The first and second steel strand tensions were the critical path activities and could only commence once the strength had exceeded 10MPa and 25MPa, respectively. Precise awareness of the concrete strength development was, therefore, critical to the swift progression of each pour cycle.

Tensioning strands is also a high-risk activity that can lead to burst anchors, cracked concrete and, worse, safety issues if performed too early. Therefore, the accuracy of the concrete strength measurements was paramount.

The solution

The Mesh sensors and wireless network were easily set up then, for 11 months and 97 concrete pours, reliably collected and wirelessly transmitted data, every 20 minutes, without fail. The 6-month battery life of the Nodes, rugged design and 50+ meter wireless range meant that managing the system during construction was simple.

Using live strength data and AI-enabled predictions, the project team could plan and execute tensioning and striking ahead of up to 24hrs ahead of schedule for every pour. The accurate, temperature-sensitive calculations meant that Careys could tension and strike slabs all year round, without risking burst anchors due to strength overestimates.

Value delivered

  • Saved up to 24hr/pour: scheduling and executing tensioning and striking of every slab pour up to 24hrs sooner than if they had used cubes
  • Improved quality and safety: In-situ, temperature-sensitive, strength calculations are accurate regardless of the weather conditions. Year-round, Careys could tension slabs, confident that anchors would not burst; reducing the risk of compromising the quality of the slabs whilst safeguarding those on site. The project was without incident over 30,000m^2 of concrete poured
  • Eliminated reliance on site cubes: ConcreteDNA automated concrete testing; reducing the man-hours invested in preparing, curing and crushing cubes. Delays caused by low-cube strengths resulting from poor cube preparation were eliminated and the project team could focus on managing the project rather than chasing cube results.

More Case Studies

Facts and Figures

<30 %
3-22 X

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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Decarbonising Precast Concrete /resources/decarbonising-precast-concrete/ Mon, 07 Feb 2022 14:54:46 +0000 /resources/decarbonising-precast-concrete/ Real-world solutions that minimise the embodied carbon of concrete.

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Problem Addressed

Precast is one of the most widely adopted Modern Methods of Construction (MMC), however as a cement-based product, concrete manufacture is a fuel and electro-intensive process, said to be responsible for 4-8% of the world’s CO2 emissions, according to .

The Industrial Decarbonisation and Energy Efficiency Roadmap to 2050 exposed an urgent need for UK cement manufacturing to become more resource, energy and carbon efficient, outlining an action plan for Government and industry to pull together to ensure decarbonisation is achieved, cost-effectively. Significant barriers exist however, on both supply and demand sides (not least cost and knowledge gaps) limiting their application to date.

The UK’s first carbon-neutral cement was launched 3 years ago yet adoption and relevant application opportunities are low, with clients, specifiers and contractors cautious of novel building materials. In addition, research by identifies the majority of products have failed to achieve commercial viability.

In an industry challenged to reinvent and address strategic priorities, such as net zero carbon, business survival is a priority. The Minerals Product Association (MPA) has expressed the need to develop solutions that are technically feasible and economically viable, maintaining the competitiveness of domestic manufacturers. However, increased demand for products and market growth, stimulated as a result of COVID, without corresponding innovation, could represent a threat to the clean growth strategy of the UK.

Solution Overview

Supported by Innovate UK funding, this R&D project built on existing research to find ways to reduce the embodied carbon of precast concrete, crucially applied against a real-world project for the Ministry of Justice (MoJ). The resulting Decarbonising Precast Concrete report provides a step-by-step a guide as to how to achieve an immediate and significant carbon reduction across the supply chain for precast concrete, emphasising collaborative behaviours in order to realise these goals.

The precast solution realised through the Decarbonising Precast Concrete project achieved a 40% reduction in embodied carbon, against the Inventory of Carbon and Energy (ICE) embodied carbon database for building materials. By adopting the recommendations within this report, companies could achieve a 40% reduction in embodied carbon, and set a solid grounding for further innovation to decarbonise concrete.

Innovate UK’s Sustainable Innovation Fund provided a welcome opportunity for the supply chain-led team to freely explore all areas of decarbonisation of a concrete structure, enabling them to challenge existing design and specification rules for optimum carbon outcomes throughout the value chain.

By building on the foundation of existing research the team were able to expedite the development of a commercially-viable, decarbonised precast concrete product, using a set of solutions that can be implemented by companies now to considerably reduce the embodied carbon of structures against industry baselines.

The solution is commercially viable and outputs include:

  • 40% reduction in embodied carbon against ICE Database
  • Easy to manufacture solution that is compliant and technically ready for adoption across multiple sectors
  • Optimised structural strength and improved concrete mix

Through the COLLABORATE – OPTIMISE – TEST – REFINE approach, companies can undertake the same process review to understand and reduce carbon across the value chain. This includes a production and logistics review, development and testing, and design solution optimisation. This is then underpinned by two Carbon Calculators, which identify the differences in carbon impact between traditional and modern methods of construction.

  1. The New whole life carbon Building Level calculator identifies where different concrete mixes and materials can be compared to inform procurement and design decisions. The calculator complies with the following standards: EN 15978, RICS Professional Statement on Whole Life Carbon Assessment for the Built Environment, EN 16757.
  2. The New whole life carbon concrete mix calculator is used to inform procurement and design decisions. The calculator complies with the following standards: PAS 2050:2011, BS EN 15804:2012, EN 16757.

Both the building level and the concrete mix calculators have been independently reviewed by ConstructionLCA. Using the above tools environmental impacts can be measured, valued and visually represented in a dashboard. Data from the supply chain, such as the environmental impacts per m3, m2 or kg of product, can be measured in the tool. This enables the comparison of the net carbon equivalent saving per element of the structure.

Case Study

The team ensured the solution was commercially viable and technically ready for adoption by companies across the sector, in the immediate. The solution is now being rolled out across the £2bn ‘4 New Prisons’ Programme for the Ministry of Justice. “This study demonstrates how collaboration through the supply chain can bring subject matter experts together to develop innovative solutions for decarbonising. We look forward to utilising and embedding such solutions in the Ministry of Justice’s New Prison Programme.’’ Gareth Jones Head of MMC & Technical Services, Ministry of Justice

Read the full case study and video here:

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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Cement alternatives /resources/cement-alternatives/ Mon, 20 Sep 2021 11:19:34 +0000 /resources/geoprime/ A sustainable alternative to cement, reducing the ecological impact of this crucial building material.

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Problem Addressed

According to, around 3.5 billion tonnes of Portland Cement are produced annually – but every tonne emits up to 622 kg of carbon dioxide. Cement is the source of about 7% of the world’s carbon dioxide emissions, according to think tank .

Solution Overview

Betolar is a Finnish materials technology company that offers sustainable concrete production with Geoprime®.

The solution converts several previously unused high-volume industrial side streams (e.g. by-products from the energy, steel, paper and pulp and mining industries) into a substitute for cement. Betolar’s mission is to enable the green transformation of various industries globally, especially in the construction, process and energy industries by providing solutions to utilise its unique materials technology.

Product coming soon to the UK. Please for more information.

Betolar’s AI-optimised innovation is available at a competitive cost compared to conventional cement-based concrete manufacturing, leveraging the existing manufacturing processes.

The Geoprime® solution can be implemented in existing production facilities – no major new investments are required. A custom solution can be put into production in 4 months and the products meet relevant EU construction standards, including compression strength and viscosity.

The Geoprime® license solution offers cost-savings in logistics, as the manufacturing process takes place close to the source of the side streams.

Facts and Figures

4 months

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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Foamed Asphalt Incorporating Manufactured Limestone /resources/foamed-asphalt-incorporating-manufactured-limestone/ Thu, 27 May 2021 15:19:48 +0000 /resources/foamed-asphalt-incorporating-manufactured-limestone/ Aggregate which captures carbon during manufacture.

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Problem Addressed

How to reduce the use of virgin aggregate and safeguard natural resources through a Carbon Capture and Utilisation Process.

Solution Overview

Typically, depending on design criteria, the upper layers of a pavement design are made up of 3 layers of Asphalt; Base, Binder and Surface Course. Although these products can be produced using an element of recycled materials, they are normally made using virgin aggregates. Such aggregates must be heated to temperatures between 140 and 190 degrees, and materials must be laid and  compacted within a narrow time frame, circa 2 hours.

Foamed Asphalt incorporating Manufactured Limestone (M-LS) by O.C.O Technology can replace the base and binder layers in traditional pavement and, depending on the design criteria, could use between 20% and 50% of M-LS Carbon negative aggregate in the mix. This coupled with other recycled aggregates, for example asphalt plannings, can provide a product using around 90% recycled products. An additional benefit for the base replacement is that the material is laid cold and can be stored for several weeks and the binder replacement can be laid within 8 hours of production. In certain applications, this product can also be produced on site using a mobile production plant,  reducing vehicle movements.

O.C.O Technology has developed a process – Accelerated Carbonation Technology (ACT) – that utilises carbon dioxide gas as a resource to treat and valorise a wide range of wastes. ACT is a genuine carbon capture and utilisation (CCU) process with significant volumes of carbon dioxide being permanently captured. Many residual materials react naturally with carbon dioxide. If the conditions are carefully controlled, this natural reaction can be accelerated to take place in minutes rather years. This results in the formation of calcium carbonate (limestone) and other very stable complex compounds.

The ACT process has been applied in the UK to the treatment and recycling of ‘fly ash’ residues from modern Energy from Waste (EfW) facilities. Known as air pollution control residues (APCr) the material is a hazardous waste and historically has been treated and landfilled. The ACT process allows the recycling of APCr into an aggregate product that is used in the manufacture of building blocks. The quantity of APCr in the UK is increasing due to the growth in EfW facilities, so the deployment of the ACT is opportune as it reduces the requirement for landfill and provides a recycling solution.

ACT not only recycles the residual material; it also captures CO2 during the manufacturing process. The aggregate has a carbon footprint in the region of -40 to -50 kg CO2 eq per tonne of aggregate produced. In the financial year ending September 2020, O.C.O treated 132,000 tonnes of APCr to create 316,000 tonnes of aggregate, permanently capturing approximately 15,000 tonnes of CO2.

No direct cost information has been provided at this time, but O.C.O Technology state that costs for this solution may be reduced compared to conventional asphalt design.

Case Study

The product has been used in the pavement design and construction of a cycle path in the West Midlands. The foamed asphalt replaced the AC32 Base layer of the construction, circa 1800 Tonnes. In the manufacture and delivery of the Base, over 90% of the total product was recycled utilising up to 20% of M-LS in the recipe. This has shown a significant carbon reduction using this design.

Facts and Figures

-40 to -50 kg CO2 eq

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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Manufactured limestone aggregate for low carbon construction /resources/manufactured-limestone-aggregate-for-low-carbon-construction/ Wed, 12 May 2021 16:42:16 +0000 /resources/m-ls-manufactured-limestone/ Aggregate which captures carbon during manufacture.

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Problem Addressed

How to reduce the use of virgin aggregate and safeguard natural resources through a Carbon Capture and Utilisation (CCU) Process – permanently capturing significant volumes of carbon dioxide.

Solution Overview

Manufactured Limestone (M-LS) carbon negative aggregate creates the opportunity for genuine low carbon or carbon negative construction. M-LS can be used in a variety of construction applications including in the manufacture of medium density building blocks or used in low strength concretes. O.C.O Technology has developed a versatile process – Accelerated Carbonation Technology (ACT) – that utilises carbon dioxide gas as a resource to treat and valorise a wide range of wastes. ACT is a genuine carbon capture and utilisation (CCU) process with significant volumes of carbon dioxide being permanently captured. Many residual materials react naturally with carbon dioxide. If the conditions are carefully controlled, this natural reaction can be accelerated to take place in minutes rather than years. This results in the formation of calcium carbonate (limestone) and other very stable complex compounds.

The ACT process has been applied in the UK to the treatment and recycling of ‘fly ash’ residues from modern Energy from Waste (EfW) facilities. Known as air pollution control residues (APCr) the material is a hazardous waste and historically has been treated and landfilled. The ACT process allows the recycling of APCr into an aggregate product that is used in the manufacture of building blocks. The quantity of APCr in the UK is increasing due to the growth in EfW facilities, so the deployment of the ACT is opportune as it reduces the requirement for landfill and provides a recycling solution. ACT not only recycles the residual material, it also captures CO2 in the process to create a carbon negative aggregate. The aggregate has a carbon footprint in the region of -40 to -50 kg CO2 eq per tonne of aggregate produced. In the financial year ending September 2020, O.C.O treated 132,000 tonnes of APCr to create 316,000 tonnes of aggregate, permanently capturing approximately 15,000 tonnes of CO2.

The M-LS is used used in multiple applications in the construction industry. Predominantly used in the manufacture of medium dense blocks for builders alongside being incorporated into 6 series materials and as a blend in Type 1. Extensive research and R&D into using the aggregate in concrete and foam mix asphalt applications is currently taking place. By using the material as a blend, it allows the quarries to control the utilisation of their virgin aggregates in a more sustainable manner.

M-LS offers a saving of -44kg per ton of CO2. This has been independently verified and certificated to a PAS 2050 standard.

Case Study

Two of the UK’s largest block manufacturers use the M-LS Block mix product in their medium dense blocks as well as some independent block makers. This has seen a total of 21 million blocks produced in the UK with our product which equates to 8,000 three-bedroom houses. Some of the biggest producers of aggregates are utilising our product in Type 1 as it protects their reserves and the finished product gives durability, strength and compactability as well as having the all-important green credentials.

Facts and Figures

-40 to -50 kg CO2 eq

This page presents data, evidence, and solutions that are provided by our partners and members and should therefore not be attributed to UKGBC. While we showcase these solutions for inspiration, to build consensus, and create momentum for climate action, UKGBC does not offer commercial endorsement of individual solutions. If you would like to quote something from this page, or more information, please contact our Communications team at media@ukgbc.org.

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