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Foamed concrete provides support during M25 widening

Propump Engineering was awarded the contract to pump 650m3 of foamed concrete into redundant drainage systems below the newly widened carriageway of the M25 clockwise and anti-clockwise carriageways by Skanska Balfour Beatty.

The requirement was to deliver a foamed concrete application in a density of 1100 kg/m3 proved ideal for the wide diameter drainage pipes running beneath the hard shoulder. Also it was proven to be the most efficient economical solution.

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 the drains on the hard shoulder.

Skanska Balfour Beatty is widening 65 miles of motorway for Connect Plus on behalf of the Highways Agency, under the 30 year DBFO contract awarded in 2009. The widening programme is designed to provide an increase in the number of traffic lanes from three to four in both clockwise and anti-clockwise directions.

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