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Hanson reaches milestone in TwentyTwo contract

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World Cement,

Hanson has reached the half way point of its contribution to the TwentyTwo tower. At 278 m and costing £591 million, the tower is set to be the tallest building in the City of London when it is completed in 2019.

Hanson is now half way through its three year contract to supply the project with concrete, having delivered more than 52 000 m3 of concrete structural mixes. The concrete that the company supplies is for use in the crore, columns, and floor slabs.

All of the mixes that the company is supplying contain its Regen ground granulated blastfurnace slag. This is a cement replacement product that enhances the durability of concrete, while adding to its sustainability credentials. Containing 68% Regen, its use in the raft slab also helped to minimise the production of heat, reducing the risk of thermal cracking.

Located in Bishopsgate, TwentyTwo will contain 62 floors of flexible workspace for up to 12 000 people. The steel-framed tower also has a central, supporting jump-form concrete core and perimeter concrete columns.

The company is supplying a range of bespoke mixes to the contractor Careys Civil Engineering, from its Kings Cross, Silvertown, and Victoria Deepwater plants. These mixes include jump-form and lightweight concrete mixes, as well as a complex design for 22 feature columns, which range in size from 4.5 m to 16 m high.

“We have pumped lightweight concrete mixes higher than ever before,” said Ian Goddard, Technical Production Manager at Hanson Concrete. “By supplying 54 floors for the project so far, Hanson has already exceeded the previous record in London, which was 50 floors at One Canada Square, Canary Wharf.”

“Hanson has supplied concrete mixes that have been successfully pumped up to a height of 270 m,” said Matt Kirsop, Project Manager at Careys Civil Engineering. “The mixtures are highly workable, allowing our operatives to efficiently place and achieve the required finish.”

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UK cement news Cement news 2018