CASE STUDY PASSIVE FIRE RESISTANCE Precast Tunnel Segments Northern Line Extension London, United Kingdom As part of the ongoing improvements to the London Underground System, Transport for London (TfL) approved the extension of the Northern Line to Battersea, to help regenerate the Vauxhall, Nine Elms and Battersea areas, supporting 25000 new jobs and more than 20000 new homes. Two new stations are to be built at Nine Elms and Battersea Power Station, targeted for completion in 2020. The line extension is constructed using interlocking precast tunnel segments containing steel fibre reinforcement and monofilament micro synthetic fibres. Morgan Sindall were awarded the contract to produce the precast tunnel lining segments. Challenge Explosive spalling of concrete when i

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