TECHNICAL | BTS/CONCRETE


Right, figure 6:


EFC temp works pour at Kidbrooke, on LPT-2 project


Above left, figure 7: LPT-2 team at Hurst during 736m3


EFC


permanent works pour on Earth Day, 2023


Above right, figure 8: Segments being cast at Max Bogl factory


conditions. This gave confidence to all concerned


that the durability results as shown by Australian testing were valid. The durability results in conjunction with the


other trial results were combined into test reports and material approvals. At the end of 2022, HMJV gained approval for use of EFC in both temporary and permanent works from both the designer of the permanent works – Aecom – and the client – NG.


Next steps HMJV is planning workshops with Wagners, OTB Concrete, and Capital Concrete, to educate staff and operatives on EFC before further use. Temporary works pours are planned on several sites and permanent works opportunities are also being


22 | July 2023


investigated. As long as shaft pumping tests at Kidbrooke for temporary works are successful, HMJV plan to undertake a 736m3


permanent works pour at the base


of a shaft at Hurst, which will be the largest continuous cement-free concrete pour in the world.


[Post lecture note: the Hurst pour for permanent works took place on Earth Day, Saturday 22 April 2023. Through it, HMJV and NG saved 80 tonnes of CO2


e compared to a typical ‘low carbon’ concrete (ie high GGBS replacement).


Further trials are also being undertaken by HMJV on LPT-2’s Package 5 for a C40/50 mix, following the same testing as previously undertaken, with the addition of a self-compacting test, which will be a J Ring Test to BS EN 12360-12.


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