Title: A STUDY OF PAVEMENT FAILURE AND ITS REHABILITATION ON CONCRETE SLAB ON AN EXPRESSWAY
Abstract: Asphalt mixture on bridges is required to have such characteristics as flexibility to follow the slab deflection, resistance against impact caused by bumps and joints, and water tightness against rainfall in addition to properties against flow, wear and skid. On the expressways in Japan, on the other hand, porous asphalt pavement, which has been proved very effective in terms of safety and noise reduction, 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. It has been constructed on bridges and viaducts as well. It has also been applied to the expressway with which this paper is dealing. Previously, the pavement structure on the bridges and viaducts of the expressway had been of dense-graded asphalt of 7.5cm thick with waterproof layer on the concrete slab, which resulted in potholes appearing a couple of years after the opening to traffic. Excavation of pits in the original pavement in question revealed that the main cause of the 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.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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