Modelling of stresses and strains in bonded concrete overlays subjected to differential volume changes |
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| Authors: | Jian Zhou Guang Ye Erik Schlangen Klaas van Breugel |
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| Institution: | aMicrolab, Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, 2600 GA, Delft, The Netherlands;bMagnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent, Belgium |
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| Abstract: | The differential volume changes between repair material and substrate concrete induces stresses in concrete overlays. These stresses could cause the repair material cracking or the interface delamination, which facilitate the penetration of harmful substances into concrete and hence accelerate the deterioration of concrete overlays. In order to investigate the characteristics of these stresses, an analytical model has been developed based on the plate theory and the assumption of the linear relation between shear stress and slip at the interface. This model is able to calculate the tensile stress in the repair material, shear and normal stresses at the interface and the corresponding strains. With this model, the influence of the interface shear stiffness, the dimension of the concrete overlay, and the elastic moduli of two materials on stresses and strains was studied. |
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| Keywords: | Analytical model Bonded concrete overlay Stress and strain Differential volume changes |
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