NameˇˇKimihiko WAKASUGI
Title Influence of bond stress between courses over fatigue resistance of the grid-panel-type buried joint
AdvisorˇˇOsamuˇˇTAKAHASHI
An expansion joint discontinues surface of road pavements in viaducts, and raises not only noise and vibration but also damage to itself. Use of a buried joint is one of effective methods to provide a joint-less surface. The grid-panel-type system is a typical and practical buried joint in Japan.
It is empirically known that durability of the buried joint is dependent on a type of surface cource and a kind of the asphalt binder. Past researches have found out that performance of the surface course is not a primary factor on fatigue resistance of the buried joint. This study focuses on the bond stress between surface cource and binder course and evaluates the fatigue resistance using various surface materials. To assess the real situation of joint on long spanned viaducts, the cyclic bending fatigue tests were curried out with the two-layered specimens. A split-off test, which was newly developed by this research, was also conducted to evaluate the bond stress between the courses.
The objectives of the study are as follows;
(1)To quantitatively estimate a relationship between the performance of surface course and the fatigue resistance of the two layered buried joint,
(2)To find out an effective improvement for the fatigue resistance.
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