On the expressways in Japan porous asphalt pavement has been widely and increasingly used as a standard surface course in order to provide the users with a safer and more comfortable pavement surface. Excavation of pits in the original pavement in question revealed that the main cause of failure was the penetration of water between the leveling course and the concrete slab as well as between the surface and leveling courses. Some of its section had been rehabilitated with the surface course of porous asphalt pavement with two different leveling courses, dense-graded asphalt and stone mastic asphalt, aiming at improving the water tightness of the leveling course for the concrete slab. Two types of non-destructive investigation methods were applied to find out the waterproofing effect of the leveling courses. One of them was to measure the surface temperature of the pavement by use of an infrared camera. The other utilized underground radar using the reflection of electro-magnetic waves. It was confirmed that they could be used to determine the location and area-wide distribution of water under the pavement. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E208431.
Samenvatting