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Just wash away surface problems

LETTERS

I refer to the interesting article by Diarmaid Fleming concerning early term loss of skid resistance on some stone mastic asphalt wearing courses.

In fact the problem is more common than might perhaps be thought. In addition to some instances of excess binder being present, polymer modified binders are more resistant to the action of trafficking and remain on the surface of the aggregate longer, affecting the micro texture of the road stone. Skid resistance is therefore impaired.

One very quick and cost effective solution is to remove the surface bitumen using captive hydrology.

Water is impelled on to the road surface through a rotary system via jet nozzles to wash up the binder which is recovered by a powerful vacuum in a complete one pass process.

Output of 20,000m 2per day is possible, making remedial treatment fast and minimising disruption to the road user.

We would be delighted to assist both the TRL and Derbyshire County Council in dealing with this problem.

Chris Green, divisional manager, Surface Treatments, Associated Asphalt, Highlands Lane Henley-on-Thames, Oxfordshire RG9 4PS

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