concrete for motorways

PJ Davidson

The Aberdeen Bypass is one of the largest infrastructure projects in Scotland. It’s part of Transport Scotland’s commitment to improving travel in the north east by relieving traffic pressure on local roads and allowing direct travel north to south, bypassing Aberdeen.

The new road will be 58km long and is expected to open in Autumn 2018.

PJ Davidson were working as a subcontractor for the bypass project. They were to supply and lay the pavement quality concrete and central concrete crash barrier. PJ Davidson had two of their own mobile concrete batching plants located on the contract to do this. However PJD chose to approach Accumix to deliver the concrete for the slip-formed central crash barrier. A successful slip-form barrier operation requires co-ordinated logistics and a high quality/ consistent product supply. Accumix have a track record of delivering on these contracts and were able to offer a bespoke and dedicated concrete supply solution.

The challenge was to supply 9km3 of slipform barrier concrete in 12 weeks to a work site in excess of 40 miles long. The mix design was unique to the Aberdeen Bypass project, using site won aggregates and specified admixtures. The specification for the concrete had stringent performance characteristics that were comfortably met as Accumix applied its own BSI accredited quality process.

The on-site solution consisted of:

  • A mobile 60 tonne silo
  • A telescopic wheeled loader
  • Four state of the art volumetric truck mixers
  • A skilled and experienced team to deliver the work
  • Technical resource to ensure quality compliance

The job was completed within the required period and to the required specification despite challenges from the weather, programme scheduling and raw material variability. True flexibility was shown as Accumix moved their operational base twice during the 12 week period to ensure productivity from the barrier paving team. Peak daily outputs exceeded 180m3 enabling the site team to re-coupe lost time. The ultimate mixing control provided by skilled operatives and state of the art equipment ensured the supplied mix was consistently good for paving.

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