Feyissa, Berhanu Abesha (2009)
Analysis and Modeling of Rutting for Long Life Asphalt Concrete Pavement.
Technische Universität Darmstadt
Ph.D. Thesis, Primary publication
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PhD Thesis -
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(Berhanu Abesha)
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Analysis and Modeling of Rutting for Long Life Asphalt Concrete Pavement | ||||
Language: | English | ||||
Referees: | Bald, Prof. Dr. J. Stefan ; Vormvald, Prof. Dr. Michael | ||||
Date: | 9 December 2009 | ||||
Place of Publication: | Darmstadt | ||||
Date of oral examination: | 5 October 2009 | ||||
Abstract: | Asphalt concrete (AC) pavement is one of the most important infrastructures that involve multiple layers of different materials subjected to non-uniform traffic loadings and varying environmental conditions. The repetitive traffic loadings that the road experiences during its service life, combined with temperature fluctuations, cause rutting, fatigue and other forms of deteriorations, which ultimately degrade the performance and durability of pavement structures. Both traffic volume and loads are increasing from year to year with rapid rate. The various categories of vehicles with different performance and operational characteristics contribute to pavement distresses. The dynamic load generated by heavy vehicles is considered as the primary cause of road structural damage and contribute the greater portion of the deterioration of AC pavements. Besides, the influence of temperature, which varies with time and along the pavement depth, makes an ever-changing temperature field. Extreme low daily temperature during winter and high temperature and solar radiation during summer cause thermal cracking and permanent deformation, respectively. The temperature gradient down to the depth has a direct influence on the properties of the AC structures, and hence, affects the response of a pavement while subjected to load. Estimation and prediction of the maximum distresses likely to happen within the pavement layer is vital for proper design of the pavement. Constitutive modeling of the deformation behavior of AC enables to evaluate the deterioration progress. On the other hand, better understanding of materials behaviors and structural responses of asphalt concrete in combination with of load-stress-strain computation tools, allows for optimization of asphalt pavement thickness and material choice. Until recently, AC pavements have been designed to serve for about 20-25 years, however, it has been observed that some roads have been serving for more than 40 years without the need for structural rehabilitation. Such phenomenon has strengthened the issue of prolonged service life of road pavements to be remained as a key concern for road industries for the past several years. In this research, the response of asphalt concrete has been evaluated by employing the ABAQUS finite element model. In order to take into account the effect of temperature on materials properties as well as to determine the deformation progress of a pavement under different temperature and loading conditions, a rut prediction model is developed. Various parameters critically influencing the accumulation of permanent deformation are evaluated by the Burger-material-based model developed by the Author. The FE analyses mainly have focused on the stress-strain state of AC pavement with varying loading conditions, structural geometry and material properties. The analysis showed keeping structural geometry, loading condition and other material parameters constant, an increase the E-moduli of the binder twice yields 4.9% and 14.3% reduction in vertical stresses developed at the mid-depth of the binder and base layers, respectively and increasing the same by forth fold yields as well 11.1% and 27.6% in these layers. However, there is a slight increase in stress in the wearing layer, in both cases. This holds true as well in case of increasing the E-moduli of the base course, there are increase in stresses developed on both wearing and binder courses. The FE analyses show that critical shear stresses are developed within the binder layer. It has been observed that the magnitude of the vertical stress in the wearing course is independent of the wheel configuration, however, the overlapping of stresses is gradually pronounced in the binder course. The analyses reveal that the subbase and subgrade layers suffer greatly due to the influence of the overlapping of stresses developed by dual/multiple wheels. The vertical stress developed at the top layers of the asphalt concrete is one of the major contributors for rut formation on this layer. Of course the rate of rut formation is a function of the frequency of such load application, materials properties and other external factors such as temperature. A Burger-based rutting model has been developed which can predict the accumulation of permanent deformation throughout the service life of a pavement with varying traffic load spectrum and annual and daily temperature variations. The model takes into account the hourly, daily and annual variations of the traffic, the expected traffic wheel loads and operating speed. At the same time, the time variation of temperature across the pavement depth are evaluated and associated with the material properties of the structure layers. It has been found that the higher the viscous component of the material the better the serviceability of the road without undergoing excessive deformation. Higher growth rate accelerates deformation. In addition, the structural geometries have an important contribution for the reduction of the over all permanent deformation of a pavement. It is recommended to work further on development of fatigue and other forms of damage prediction model under various loading spectrum and temperature ranges and integrate together for full scale analysis of AC pavements. |
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Alternative Abstract: |
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Uncontrolled Keywords: | Rutting, Long Life, Asphalt Concrete, Finite Element, Pavement Temperature, Traffic Loading, Pavement Modelling | ||||
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URN: | urn:nbn:de:tuda-tuprints-19953 | ||||
Classification DDC: | 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering | ||||
Divisions: | 13 Department of Civil and Environmental Engineering Sciences > Institutes of Transportation | ||||
Date Deposited: | 10 Dec 2009 07:48 | ||||
Last Modified: | 08 Jul 2020 23:33 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/1995 | ||||
PPN: | 218856059 | ||||
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