Numerical Investigation of Stress Absorbing Membrane Interlayer

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Kazemi Zanjani, Nariman | 2017

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 49946 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Motamed, Arash
Abstract:
Stress Absorbing Membrane Interlayer (SAMI) is a slightly thin layer made of bitumen and aggregate placed between a pavement with limited cracking and overlay in order to avoid reflective cracking in overlay. SAMI’s performance depends on many factors such as pavement layer’s materials and thickness and existing pavement’s condition. Numerical simulations are powerful tools to evaluate SAMI’s performance. Previous studies showed that construction of SAMI does not necessarily reduce reflective cracking. This research investigated the effect of different parameters on SAMI’s performance using numerical simulations. The focus of this study was on the performance of SAMIs used between asphalt overlays and existing concrete pavements. Numerical simulations was used to find amounts of maximum strains in SAMI and overlay (fatigue controlling parameters). This study not only presents sensitivity analyses on different layers' modulus and thickness, but also introduces a new approach for simultaneous design of SAMI and overlay. This design procedure should be evaluated by a series of laboratory tests in the future
Keywords:
Numerical Simulation ; Design ; Sensitivity Analysis ; Thickness Design ; Stress Absorbing Membrane Interlayer (SAMI) ; Reflective Cracking ; Roller-Compacted Concrete Pavement

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