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Use of Cemfree concrete for temporary slab piles at Newman St, Westminster

OVERVIEW

Murphy Ground Engineering installed 750mm

and 880mm cased rotary piles up to 34.0m to

form a triple storey basement secant wall and

bearing piles for a new Hotel development in

Westminster. As part of the top down

construction methodology and due to limited

peripheral space, a temporary slab was

designed to accommodate construction plant

during the bulk dig and spoil removal.



Due to the loadings on the temporary slab the design required 6# 880mm piles to 25.0m depth to provide support to the slab. As these piles are temporary works in design the use of Cemfree concrete was proposed, although with specific structural requirements it was imperative for the Cemfree concrete to achieve 40N strength at 56 days as well as perform to the required piling concrete characteristics as would be expected. A total of 95m3 of “C32/40” Cemfree concrete was supplied over a period of 4 days to construct the temporary works piles using temp cased rotary bored methodology.

The use of Cemfree at Newman St was aligned with MGE involvement in the LOCOWAG project led by DB Group (Holdings) Limited (DBG). The project is government funded via the Innovate UK scheme and runs from November 2020 to November 2022.

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