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Whisper concrete has gone through extensive trials on roads throughout the UK, by Britpave, the British Insitu Concrete Paving Association and the Highways Agency, and is now being used on a non-trial basis for the first time. A 45mm thick layer of the exposed aggregate concrete wearing course is being laid on top of a standard lean mix continuously reinforced concrete pavement as an overlay to 12km of life expired concrete dual carriageway in South Wales.