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Presented is a structural model for predicting the mechanical behavior of composite pavements based on Ioannides and Khazanovich’s idea. In this model, a composite pavement is modeled by overlaid plate finite element method elements connected with a link element resting on a Winkler foundation. This concept is extended to the bonded interface condition between two layers by modifying the stiffness matrix of the plate element. The model was verified by comparisons of computed results with the measured results. The comparison revealed that the developed model can predict the bending strains in thin concrete overlay on asphalt pavement. Furthermore, curling deformations with the layer separation were examined to investigate the applicability of the model. It was found that the separation between the layers occurs if the bond strength at the interface is very low.

Permeable form can improve the quality of the surface layer of concrete and can enhance the durability of concrete structures. In this study, the improvement and its evaluation for the surface layer of concrete placed with permeable form were investigated. For these purposes, accelerated carbonation test, chloride ion penetration test, air permeability test, rebound hummer test and water permeability test were conducted using the concrete specimen. As a result, it was found that the air permeability correlates the carbonation depth, chloride ion penetration depth, rebound number and water permeable volume of concrete. Moreover, the possibility that the improvement for the surface layer of concrete can be quantitatively evaluated by air permeability test was shown.

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