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Evaluation of Shear Stress at the Interface of Asphalt Layers Using Finite Element Analysis

Amjadyan, Yousef | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50839 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Tabatabaee, Nader
  7. Abstract:
  8. Tack coat is a layer of asphaltic materials, which is used for binding the surface layer to the current asphalt layer. The appropriate interlayer bonding condition will help different layers form a monolithic structure to resist traffic. The lack of proper interlayer bonding result in slippage between pavement layers, decrease the capability for transferring the load to the underlying layers, rutting, crescent cracking and decreasing the life of the Overlay. This study intends to model a pavement system in three dimensions with ABAQUS software in order to evaluate the amount of shear stress at the interface of asphalt layers. In order to prove the validity of the model, the results of the analysis were compared with the available field results. In addition, for modeling the wheel load on the pavement surface, five different situations were examined and compared with the field results. The types of load modeling are haversine load, static load, momentary load, moving load and moving load with 25% overlap. Between these types, the static load, moving load and moving load with 25% overlap were so close to the field results and there was less than 6% different with field results. In the next step, by examining different parameters, it was determined that the elastic modulus of asphalt layers and the thickness of surface layer are effective in the amount of shear stress at the interface of asphalt layers and were chosen as the examined parameters in this study. Then, by choosing a wide range as the amounts of chosen parameters, by using the results of FEM analysis in ABAQUS software, a curve was determined which states the amount of shear stress at the asphalt layers' interface. In addition, based on the study of various researchers, some types of tack coat with appropriate spreading rate were suggested for different ranges of shear stresses
  9. Keywords:
  10. Tack Coat ; Load Modeling ; ABAQUS Software ; Shear Stress ; Interface Shear Stress ; Finite Element Analysis ; Sliding Defect ; Asphalt Layers

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