IMPORTANT KEY FACTORS FOR DURABILITY OF THE TRANSVERSE JOINTS ON CONCRETE PAVEMENT

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  • 3次元FEMに基づくコンクリート舗装横断目地の耐久性向上に関する検討

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<p> It has been reported that a dowel bar (rebar) breaks in a transverse joint of concrete pavement, where a thinning of the rebar due to corrosion and a cavity of the roadbed directly below the transverse joint due to the erosion are confirmed. Therefore, FEM analysis was performed by modeling that took the state of a thinning of the rebar and a cavity of the roadbed into consideration, then the effect on the dowel bar was verified. As a result, it was confirmed that the bending stress acting on the dowel bar increases about 18 times as much as the sound state without rebar thinning nor cavity, when rebar thinning and cavity occur in combination and progress to a certain scale. Therefore, we propose to protect the transverse joint by using a material with excellent corrosion resistance for the dowel bars and by providing an asphalt intermediate course that does not easily cause erosion below the transverse joints.</p>

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