Taiki KIMURA
Comparison of Fatigue Resistance on Different Surface Asphalt Mixtures of Grid Panel Type Buried Joint
Osamu TAKAHASHI
The grid panel type buried joint is widely used on joints of viaducts as a controlling method of noise and vibration induced by running vehicles. The design service period of asphalt pavements in general roads has been regarded as ten years. The same service period is expected for the buried joints. However, serious damages are sometimes appeared on the surface of the buried joints within the design life, because local external deformation actions directly affect the asphalt layers of the joints. Therefore, the service life of the buried joints is strongly dependent on the durability of the asphalt mixture used in the surface course. It is recently increasing that open graded asphalt mixtures are used for surface course to compose porous pavements from the view point of environmental protection.
This paper focused on surface course mixtures of the buried joint, particularly open graded asphalt mixtures using modified binders. The bellowing two topics were investigated in the paper;
1) The actual situation of the buried joints in fields is clarified using the database for the buried joint
2) The fatigue resistance characteristics of surface course mixtures are evaluated by static and cyclic bending tests.
From the investigations of the database it was founded that dense graded and open graded asphalt mixtures are mainly used for the buried joint and the usage of open graded asphalt mixture is particularly increasing in the Tokyo metropolitan area. It means that selection and blending of ingredients should be carried out with sufficient consideration. The results of the bending tests showed that open graded asphalt mixture is inferior in fatigue resistance to dense graded asphalt mixture using modified binder and the performance is influenced not only by the binder but also by the aggregate blend.
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