Porous Asphalt Ravelling in Cold Weather Conditions

For environmental reasons, the application of porous asphalt (PA) concrete on the primary road network is mandatory in the Netherlands. At the moment, approximately 90% of the Dutch primary road network has a PA surfacing. During the 2008-2009 Dutch winter, temperatures dropped below -10°C nationwide and locally temperatures close to -20°C occurred. During this cold period, rapid and aggressive ravelling damage developed in some motorway sections. A short but intense national discussion about PA application followed and ended without conclusion as temperatures rose. Lifetime Optimisation Tool (LOT) is a meso scale mechanistic mixture design tool for PA discussed elsewhere. Here LOT is applied to explain the rapid development of ravelling in cold weather conditions. It is shown that LOT pinpoints exactly which phenomena cause winter damage. In the course of the work, it was also found that PA is vulnerable to ravelling at hot weather conditions. At hot conditions, however, the increase in ravelling sensitivity is far less aggressive. From this knowledge, suggestions for the improvement of the ravelling performance of PA mixtures are made. It is believed that this knowledge may be beneficial for the successful introduction of silent PA in countries that exhibit a continental climate in which summers are hot and winters are cold.

並列關鍵字

Meso scale modelling ； Porous asphalt ； Ravelling ； Winter damage

國際替代計量

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