Maxit Provides Rapid Solution For Platform Extension
THE ability to blow the equivalent of five lorry loads of traditional hardcore direct to a construction site made maxit LWA lightweight aggregate the ideal choice for extension work to a busy railway station platform.
Following Network Rail approval, contractors Walker Construction (UK) Ltd, of Folkestone, specified maxit LWA fill to overcome time and storage constraints.
Some 45 m³ of maxit LWA delivered in just one load was pneumatically pumped into place in just three hours to form the base for the 110m² central platform extension at St Margaret’s Station, South West London.
A totally natural product, maxit LWA is made from pure clay, which is expanded to form small, lightweight granules with a honeycomb core. Its use for the station project allowed placement to be completed in a tight time frame during a single night time possession.
Walker Construction specified maxit after assessing the logistical difficulties of storing and transferring traditional hardcore to the site.
The use of traditional fill would have meant five HGV deliveries to the site, which is in a busy residential area, followed by manual transfer of the hardcore to the platform by barrow. The tracks would have also have needed protection, extending the timescale.
By specifying maxit LWA in 10-20 mm granules, the contractor was able to complete the fill in one limited closure of the live tracks, compact it, then apply a sub base, followed by a dense bitumen base course topped off by a 20 mm wearing course.
Explains Peter Maddox, of Walker Construction: “Using traditional hardcore in this location, with the possession times available, would have presented severe difficulties. maxit LWA proved ideal for this application and was realistically the only option once we had been given approval.”
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