Foamed concrete proves vital at M25 widening

As part of the M25 widening scheme, Propump Engineering has pumped 200m3 of foamed concrete into 16 miles of redundant drainage systems. As more than 1 million vehicles drive over it every week, they will experience foamed concrete’s many benefits without even realising it’s there.

Working with main contractor Skanska Balfour Beatty Joint Venture, Propump Engineering was appointed to deliver a foamed concrete application to both carriageways between Junctions 27-30. Proving to be the most efficient, economical solution for a project where large volumes are required, the concrete has filled the voids within the existing drainage system – allowing the new drainage system to be installed.

Propump used its innovative Inline Foamed Concrete System (IFCS), a processing and pumping system contained on a 7.5t lorry chassis. The system was able to move easily between each manhole, pumping the concrete into approximately 40 separate sections of drains on the hard shoulder and central reservation of both clockwise and anti-clockwise carriageways.

Skanska Balfour Beatty Joint Venture started work on the widening of the M25 motorway between Junctions 27 to 30 in July 2009, as part of the Design, Build, Finance and Operate (DBFO) contract awarded by the Highways Agency to Connect Plus, a consortium of Skanska, Balfour Beatty, Atkins and Egis Road Operations Ltd.

Upon completion in 2012, road users on this section of the M25 will benefit from improved journey time reliability, increased safety , reduced congestion, improved driver information and low noise surfacing – with foamed concrete playing a crucial role in the project’s success.

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