National Grid and its contractor HOCHTIEF-MURPHY Joint Venture (HMJV) have completed the world’s largest ever continuous pour of Earth Friendly Concrete® at London Power Tunnels, a £1bn project to rewire London. 736m3, or 736,000 litres (enough to fill around two 25m swimming pools) of more sustainable, cement-free concrete was poured to fill the base of the 55m deep tunnel drive shaft at National Grid’s Hurst Substation in South London. The cement free solution was developed by Wagners and supplied by Capital Concrete and uses a binder of ground granulated blast furnace slag and fly ash geopolymer concrete system chemically activated by the use of industrial waste products instead of cement. The concrete reduces carbon by around 64%, saving an estimated 111kg of CO2 per cubic metre poured in comparison to concrete that would have traditionally been used. The use of Earth Friendly Concrete was driven forward by a team of young engineers on the project and supported by HMJV’s engineering experts and AECOM, Mott MacDonald and WSP, following several trials at different London Power Tunnels sites. The record-breaking pour on Earth Day (22 April) at National Grid’s Hurst substation site was needed to infill the base of the 55m deep tunnel shaft to its permanent level, following the successful completion of 9.2km of tunnelling over 2 tunnel drives from Hurst to Eltham and Crayford. Elsewhere on the London Power Tunnels project, there are several measures in place to reduce the environmental impact of construction and keep National Grid on track to achieve net zero carbon construction by 2025/26. These include: Optimisation of designs and construction methodologies of the tunnel and shafts network by HMJV saving approximately 50,000 tonnes of CO2, leading to a 30% reduction against baseline. 99.98% of project waste being diverted away from landfill, a 21% reduction against the carbon reduction pre-project baseline for shafts, tunnels and headhouses, equivalent to 25,250 tonnes of CO2. A new 400kV substation at the heart of the project in Bengeworth Road, Lambeth will be built using SF6 free gas insulated switchgear technology in a UK first. This world record-breaking pour also offers the opportunity to evaluate the technology ahead of future possible rollout across our network in England and Wales, demonstrating our ambition to achieve net zero construction across all our projects by 2025/26. National Grid Project Director, Onur Aydemir said: “We are always looking for new ways to innovate and to now be using this carbon saving cement-free alternative to conventional concrete at scale and on site is exciting. This world record-breaking pour also offers the opportunity to evaluate the technology ahead of future possible rollout across our network in England and Wales, demonstrating our ambition to achieve net zero construction across all our projects by 2025/26.” Raj Kundan, Technical Lead for HOCHTIEF-MURPHY Joint Venture said: “At HMJV, in conjunction with our supply chain family, we strive to advance innovative and cutting-edge solutions – and the incredible work the team have done on the project in the trialling and large-scale use of Earth Friendly Concrete in temporary as well as permanent applications is a great example of that. “Completing the largest ever continuous cement free concrete pour is testament to the ingenuity and collaboration of all involved working as part of this Project 13 Enterprise scheme, and shows how a client, contractor and the supply chain can work together to help take a major step moving the industry forward in reducing carbon emissions.” Andy Izod, UK Regional Manager for Wagners said: “We are delighted that National Grid and HOCHTIEF-MURPHY Joint Venture have chosen to use Earth Friendly Concrete (EFC) at their LPT project as by using an ultra-low carbon concrete for this application they have saved an estimated 82 tonnes of CO2, which is roughly the equivalent of driving a new car 18 times around the world. “This is the largest continuous EFC pour that has ever been undertaken and to do it on Earth Day, the 22nd of April, is quite fitting. We hope that other major clients will follow National Grid’s example in helping us to decarbonise the construction sector.” Luke Smith, Managing Director of Capital Concrete said: “We have been supplying Earth Friendly Concrete since January 2020 as a low carbon, high performance alternative to standard, cement-based concrete. “We are delighted that the Capital Concrete team could work together with Hochtief-Murphy to provide the technical expertise and focus on customer service to deliver the biggest EFC pour globally to date over an 11-hour period for the London Power Tunnels Project.”
J. Murphy & Sons Limited has become the first construction company in the UK to join the Employ Autism programme after signing a new autism charter. Through the Employ Autism programme, Murphy will provide paid internships to autistic candidates, with training provided by Ambitious about Autism to ensure that the internships are successful. The programme will be rigorously evaluated to encourage replication and influence policy and practice, helping to increase autistic people in full-time employment and enabling workplaces to be truly neurodiverse. This initiative is part of Murphy’s holistic approach to addressing underrepresentation, which includes its Kickstart programme providing job opportunities for more than 50 long-term unemployed young people aged 16-24; its work with the Home Office offering up to 175 refugees employment opportunities across a variety of roles; its work with Berwyn Prison creating a long-term, sustainable training and employment rehabilitation journey for prison leavers; among other social initiatives. It also forms part of Murphy’s purpose, which is to improve life by delivering world-class infrastructure. Employ Autism is a programme developed by Ambitious about Autism, the national charity standing with autistic children and young people, which aims to provide autistic people with access to paid internships and employability support. Working in partnership with the Department for Work and Pensions (DWP), Ambitious about Autism has created the Covenant for Employers to encourage businesses to commit to creating employment opportunities for autistic people. Murphy is the first construction company to sign up to the charter. Dawn Moore, Group People and Communications Director at Murphy, said: “We are proud to be the first construction company in the UK to sign the autism charter and join the Employ Autism programme. Murphy is committed to creating a great place to work where our people feel secure and comfortable to be themselves – providing opportunities to those who are traditionally underrepresented in our industry and supporting them in their career progression is a key part of this. We look forward to working with Ambitious about Autism and other partners in the Employ Autism network to achieve our common goal of increasing diversity and inclusion in the workplace.” Jolanta Lasota, Chief Executive of Ambitious about Autism, added: “We are delighted to welcome Murphy to the Employ Autism programme and thank them for standing with autistic young people. With only 29% of autistic people in any form of employment, it is vital that businesses across the UK commit to creating more diverse and inclusive workplaces and we hope other employers will join Murphy in doing so. We look forward to working with them to achieve our goal of helping autistic young people realise their ambitions.”
