Noice Reducing Exposed Aggregate Surfaces – Experience and Recommendations

In 1990 a technique for building pavements with a noice reducing concrete surface was developed in Austria. The top layer contains aggretate with 8 mm maximum size. The surface is sprayed with a retarder and brushed the next day to expose the aggregate. This technique has been used on 120 km of carriageway. Tyre-road noice is as low as with other noice reducing surfaces, skid resistance is better than with the conventional technique and there are no problems with winter maintenance.