A Study of Resilient Behavior and Constitutive Modeling of Thick Granular Layers for Heavily Loaded Asphalt Pavements
Author | : Suckkeun Rhee |
Publisher | : |
Total Pages | : 460 |
Release | : 1991 |
Genre | : Granular materials |
ISBN | : |
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Author | : Suckkeun Rhee |
Publisher | : |
Total Pages | : 460 |
Release | : 1991 |
Genre | : Granular materials |
ISBN | : |
Author | : National Research Council Canada |
Publisher | : |
Total Pages | : 716 |
Release | : 2001 |
Genre | : Engineering |
ISBN | : |
Author | : Lijun Sun |
Publisher | : Butterworth-Heinemann |
Total Pages | : 1072 |
Release | : 2016-08-09 |
Genre | : Technology & Engineering |
ISBN | : 0128028939 |
Structural Behavior of Asphalt Pavements provides engineers and researchers with a detailed guide to the structural behavioral dynamics of asphalt pavement including: pavement temperature distribution, mechanistic response of pavement structure under the application of heavy vehicles, distress mechanism of pavement, and pavement deterioration performance and dynamic equations. An authoritative guide for understanding the key mechanisms for creating longer lasting pavements, Structural Behavior of Asphalt Pavements describes the intrinsic consistency between macroscopic performance and microscopic response, structure and material, as well as global and local performances, and demonstrates the process of pavement analyses and designs, approaching science from empirical analyses. Analyzes the external and internal factors influencing pavement temperature field, and provide a review of existing pavement temperature prediction models Introduces a “Bridge Principle through which pavement performance and fatigue properties are consolidated Defines the intrinsic consistency between macroscopic performance and microscopic response, structure and material, as well as global and local performance Summaries the mechanistic response of pavement structure under the application of heavy vehicle, distress mechanism of pavement, pavement deterioration performance and dynamic equations, and life cycle analysis of pavement
Author | : Manikanta Saladhi |
Publisher | : |
Total Pages | : 105 |
Release | : 2017 |
Genre | : |
ISBN | : |
Recycled Asphalt Material (RAP) is defined as removed and reprocessed pavement materials containing asphalt and aggregates. These materials are obtained when asphalt pavements are removed for the rehabilitation and maintenance of distressed pavements. The use of RAP as a base/subbase aggregate in pavement construction is technically and environmentally a sustainable solution, and conserve use of natural resources by requiring less virgin aggregate in pavement construction. Past studies showed that the use of 100% RAP as base course lacks shear strength and can undergo large deformations. Geocells are a system of threedimensional, interconnected, honeycombed cellular structures that resist the lateral expansion of soil particles and act like a slab to distribute surface loads over a larger area of the foundation soil. Most of the recent studies on geocell-reinforced RAP bases show that they improve the pavement service life, strength and stiffness of base layer. The main objective of this research was to develop and construct a large-scale laboratory test setup, which was used to perform a series of cyclic plate load tests to examine resilient behavior of geocell-reinforced RAP bases. Six large-scale laboratory cyclic plate load tests and two static plate load tests were conducted on unreinforced and geocell-reinforced RAP base road sections. The unpaved road sections consisted of moderate subgrade, unreinforced/geocell-reinforced RAP base, and a RAP cover. The test results showed that the geocell-reinforcement improved the performance of RAP bases. The high hoop strength of the geocell reinforcement provided more confinement and offered additional resistance against lateral movement of RAP base. The geocell reinforcement significantly reduced the permanent and resilient deformations of RAP base when compared to that of unreinforced RAP bases, thereby increasing resilient modulus of the reinforced base layer. The geocellreinforced RAP base layer acted as a stiff mattress foundation and resulted in lower compression of RAP base and subgrade. The geocell reinforcement significantly reduced the permanent deformations of RAP base approximately by 50% when compared to that of unreinforced RAP base. Additionally, the geocell reinforcement had increased resilient modulus of RAP base by a factor of 3.0, compared to that of unreinforced RAP base.
Author | : Thomas D. White |
Publisher | : Transportation Research Board |
Total Pages | : 65 |
Release | : 2002 |
Genre | : Pavements |
ISBN | : 0309067219 |
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2004 |
Genre | : |
ISBN | : |
Performance modeling of asphalt concrete pavements is one of the most difficult, but important tasks facing pavement engineers. Experiences at North Carolina State University suggest that this task is best accomplished by utilizing two separate models; one to account for the material behavior and another to account for boundary conditions, such as tire-pavement interaction, temperature gradient along the layer thickness, pavement structural design, etc. The material characterization model should focus on the material irrespective of geometry, i.e., fundamental properties. The structural model should be robust enough to account for the range of conditions experienced by pavements in service. Two peer-reviewed and published papers are presented here which deal with the development of a constitutive material model for asphalt concrete. In the first, the viscoelastoplastic continuum damage model in tension is applied to materials from the Federal Highway Administration's Accelerated Load Facility study on modified mixture performance. It is shown that the material model is capable of describing the behavior of the tested mixtures over a range of conditions from primarily viscoelastic to primarily viscoplastic. Further, the model shows sensitivity to changes in asphalt binder and the ability to predict the behavior of asphalt concrete mixtures containing polymer modified binder. The second paper presents results from an experimental study of anisotropy in asphalt concrete. Anisotropy occurs due to the preferential orientation of aggregate particles in the mixture and is found to have varying levels of significance depending on both the mode of loading and the levels of deformation applied. In the linear viscoelastic range, anisotropy is found to have little effect on the material behavior, whereas under monotonic compressive loading until failure, it is found to contribute significantly. Further, it is found that temperature and rate affect the significance of anisotropy.
Author | : Yu T. Chou |
Publisher | : |
Total Pages | : 420 |
Release | : 1977 |
Genre | : Granular materials |
ISBN | : |
Author | : George H. Minassian |
Publisher | : |
Total Pages | : 426 |
Release | : 2003 |
Genre | : Axial loads |
ISBN | : |
"Granular layers are essential contributors to the structural integrity of the pavement system, their premature deformation radically decrease support of the asphalt concrete surface layer, thus leading to the early deterioration of the overall pavement structure. This research was conducted to better understand the behavior of granular materials when subjected to the complex nature of traffic loading. Long-term triaxial tests were conducted on typical Alaskan base course material using both repeated as well as cyclic loading to also account for the shear reversal effects induced by wheel load. Results show that the shear reversal component of the traffic loads, which have been ignored so far, induces considerable damage to the granular layers. Models were presented to predict the different soil moduli while also accounting the effect of strain hardening or densification due to the repetitive nature of the loads applied. Moreover, a simple yet powerful model was presented to predict accumulated permanent strains as function of the stress state, number of load repetitions and the strength level applied. The results obtained in this study also show a clear indication of the existence of given stress level limit beyond which incremental collapse of the system takes place. Furthermore, regions of instability of granular layers subjected to dynamic loading have been defined using a simple response parameter and monotonic shear strength of the soil. An effort was made to explain the instability zones identified in this research by the shakedown theory"--Leaf iii.