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Geocomposites in Rail – Frieslands Case Study

Ballast Renewal – Filtration and Confinement

Project Information

Location

Mantgum, Friesland, The Netherlands

Contractor

Spitzke

Designer

ProRail

Product Functions

Filter/Separator with Ballast Confinement

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The Spitze ballast-cleaning train is used extensively to deal with contaminated ballast. Running at 3m/s, the train lifts a length of the track, extracts, then washes and re- places the ballast. The track is then lowered back in to place.

This exercise is also a good opportunity to deploy a geosynthetic to combat the contamination problem and extend the maintenance interval. On this occasion, RK4 - a textile/grid composite, was installed to stabilise the ballast/subgrade interface and reduce the upward movement of subgrade fines.

Using the 30m long by 3.2m wide composite, avoided the complication of controlling two separate products and the result was a faster installation.

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