Carbon-busting concrete trials launched

10/02/2022 | CHRIS AMES

Skanska is trialling an 'industry-first low carbon-reinforced concrete solution' on a major National Highways scheme.

Production of cement, a key ingredient in concrete, currently accounts for around 7% of the world’s CO2 emissions, although in the UK this figure is less than 1.5%.

The £282m M42 Junction 6 improvement project is trialling the use of low carbon concrete and basalt fibre reinforcement on a temporary haul road for construction vehicles, comparing it against traditional steel-reinforced concrete.

The trial is led by Skanska in partnership with the National Composites Centre.

Glennan Blackmore, Skanska UK’s operations director (highways), said the combination of low carbon concrete and the replacement of the steel with a lightweight composite reinforcement reduces the carbon footprint by more than 50%.

‘With support and funding from customer National Highways, we have been able to bring together the knowledge, skills and innovative thinking from expert teams within Skanska, the National Composites Centre and supply chain partners Basalt Technologies and Tarmac to carry out this exciting trial,' he said.

‘Through using a unique combination of materials, we are working to not only cut carbon but also aiming to improve the structural performance of reinforced concrete and deliver better productivity, safety and cost outcomes.

‘We are thrilled at the progress achieved to date and we are very excited to see the results.'

Tarmac provided two types of concrete for the trial: a mix comprising conventional blended cementitious material and a low carbon alternative mix incorporating an Alkali Activated Cementitious Material (AACM) in place of the cement.

Its head of commercial engineering, Robert Gossling, said: 'Tarmac has developed new low carbon concrete technology and this trial is a great opportunity to collaborate with industry-leading project partners to test its performance through an ideal, real-life application.

‘Manufactured at a conventional concrete plant located close to the project and installed in exactly the same way as traditional materials, this new sustainable product delivers a carbon footprint up to 80% lower than a standard CEM I concrete. We hope this demonstration will help to accelerate the development of innovative low carbon materials.’

Malcolm Newton, director at Basalt Technologies, said: ‘Basalt is a lightweight composite material consuming 62% less CO2e than steel during its manufacture. It comprises a non-metallic inert material that does not corrode, making it more durable than steel. Basalt Fibre reinforcement is also four to five times lighter than steel, making it safer to handle, fix and transport with fewer lorry movements.'

More about the trial

Following the start of the trial in early December 2021, field and laboratory tests will be carried out over the coming months.

Four reinforced concrete slabs were cast at the M42 Junction 6 site as part of a temporary haul road that will be heavily used by construction vehicles and will be monitored over the duration of the works.

The slabs are made up of:

  • Slab A – Conventional concrete + steel reinforcement
  • Slab B – Low carbon concrete + steel reinforcement
  • Slab C – Conventional concrete + basalt reinforcement
  • Slab D – Low carbon concrete + basalt reinforcement

The project team is now monitoring the slabs in-situ. Full scale test slabs have been sent to a specialist laboratory for bending and shear testing.

Skanska said all the collected test results will build knowledge of the curing process, ease of construction, safety benefits, functional properties and structural behaviour of the various concrete and reinforcement combinations, which will provide insight into the future use of longer lasting materials in construction.

It added that the trial will also provide a better understanding of the impact of the use of these materials ahead of the proposed revision to Eurocode 2 standards that will include the use of composites in the design of concrete structures. This is currently being developed.

Highways InProfile

latest magazine issue
Highways jobs

Senior Civil Engineer - Major Projects x 4

£45,894.00 - £54,952.00
We are looking for experienced engineers to help us progress a number of key projects and programmes Glasgow, Glasgow City
Recruiter: Transport Scotland

Technician - Maintenance

£31001.0000 - £36471.0000 per annum
Essex Highways is responsible for managing and maintaining one of the largest highway networks in the country
Recruiter: Essex County Council

Highways Contract Engineer

£46,731 - £49,764
The team helps provide a safe road network that operates efficiently and effectively.  Northamptonshire
Recruiter: North Northamptonshire Council

Principal Transport Planner

£46,731 - £49,764 (pro-rata)
We are looking for an experienced professional to join us on a six-month temporary contact as a Principal Transport Planner. Kettering, Northamptonshire
Recruiter: North Northamptonshire Council

Highways Maintenance Operative

£Competitive
We have a fantastic opportunity for a Permanent Highways Maintenance Operative Broughton, Brigg
Recruiter: Amey

Head of Highways Contracts & Network

£81,803 progressing to £90,664 per annum
The team includes approximately 60 directly employed HCC people Hertfordshire
Recruiter: Hertfordshire County Council

Principal Construction Manager

£Competitive
We are excited to offer a fantastic opportunity for a Permanent Principal Construction Manager Yorkshire and the Humber
Recruiter: Amey

Quality Technician

£Competitive
We are excited to offer a fantastic opportunity for a Permanent Quality Technician Yorkshire and the Humber
Recruiter: Amey

Senior Highway Engineer (Development Management)

£42679.0000 - £50211.0000 per annum
Senior Highway Engineer (Development Management)Permanent, Full Time£43,960 to £51,718 per annum*Location
Recruiter: Essex County Council

Project Manager (Major Projects)

£44,711 - £47,754
Are you an experienced project professional or engineer with looking to take the next step in your career? Halifax, West Yorkshire
Recruiter: Calderdale Metropolitan Borough Council

Senior Civil Engineer - Roads

£45,894 - £54,952
Are you an experienced engineer looking to support the Scottish Government’s national objectives. Scotland
Recruiter: Transport Scotland

Senior Civil Engineering Technician

Grade 7 £29,093 to £32,654 per annum
We are looking for a flexible individual who has the ability to meet targets and analyse and resolve complex technical problems and formulate a design Durham
Recruiter: Durham County Council

Project Team Manager

£55,147 to £60,676 per annum
We are pleased to be able to offer an opportunity for a role as Design Team Manager Norwich, Norfolk
Recruiter: Norfolk County Council

Clerk of Works

GRADE 08 (£37,938 - £41,511)
Warrington is one of the most successful towns in the country Warrington, Cheshire
Recruiter: Warrington Borough Council

Assistant Projects Engineer

GRADE 06 (£29,093 - £32,654),GRADE 07 (£33,366 - £37,035), GRADE 08 (£37,938 - £41,511)
Warrington is one of the most successful towns in the country Warrington, Cheshire
Recruiter: Warrington Borough Council

Principal Engineer - Traffic Management

£45,718 - £48,710 per annum
At Bath & North East Somerset Council we have one overriding purpose – to improve people’s lives. Bath, Somerset
Recruiter: Bath & North East Somerset Council

Vehicle Technician - Improver

£28,624 - £30,060
Transport Services is responsible for all aspects of transport and related services Huddersfield, West Yorkshire
Recruiter: Kirklees Metropolitan Council

Programme Delivery Office Administrator

Grade 9 £31,344 - £33,253 per annum
At Derbyshire, we have been on a journey to transform the way we deliver highway services to make them fit for the future Derbyshire
Recruiter: Derbyshire County Council

Support Officer - Highways Asset Management Systems

£31,586 - £34,314
We are a forward-thinking organisation dedicated to maintaining and improving our highway infrastructure. Lincolnshire
Recruiter: Lincolnshire County Council

Principal Transport Planner (Strategy)

£46,731-£49,764
We are looking for an experienced professional to join North Northamptonshire Council as a Principal Transport Planner (Strategy). Sheerness House, 41 Meadow Road, Kettering moving to Haylock House, Kettering Parkway, Kettering NN15 6EY, United Kingdom
Recruiter: North Northamptonshire Council
SUBSCRIBE NOW

Latest Video

Subscribe to Highways today to ensure you keep your finger on the pulse of everything happening in the UK road network throughout the year.

SUBSCRIBE NOW