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A road surfacing treatment for sites which are 'fatted up' or covered in patches of varying hardness, has been developed by Colas.Called Colas Mosaic, the treatment consists of an initial application of uncoated aggregate, followed by a layer of binder. A further layer of aggregate then completes the surface.The company says that the system, which is based on techniques developed in mainland Europe, is quickly applied, using minimal disruption to traffic.Colas Mosaic is suitable for sites where the sudden, unexpected failure of a surface dressing has left a binder covered, slick surface, or where heavier traffic than expected has led to fatting up in wheel tracks or across the whole width.The new surface treatment makes an expensive and time consuming remedy such as planing off and overlaying unnecessary, claims Colas.Colas, Tel: 0342 714949. CONSTRUCTION NEWS