In order to alleviate problems caused by heavy road traffic passing through Ridgemont in Bedfordshire, a new 2.5km bypass was planned for the village. T o complete the scheme, it was necessary to construct two embankments for a new rail bridge crossing the existing railway in the area. Traditionally, a primary aggregate would have been used for such a task. However on this occasion, to minimise the ‘green’ cost of the project, PFA was

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