Download or read book Rutting Mechanism Analysis of Heavy duty Asphalt Pavement Based on Pavement Survey Finite Element Simulation and Instrumentation written by Zejiao Dong and published by . This book was released on 2012 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vertical strain of an asphalt layer is essentially important when identifying rutting mechanisms or causes in asphalt pavement with a semi-rigid base course, which is a typical pavement structure in China. As a result, three directional strain measurements (longitudinal, transverse, and vertical strain) in the field, together with a pavement rutting survey and finite element simulation, were carried out in order to clarify the causes of rutting happening in Beijing heavy-duty expressways. First, the basic principal of a fiber Bragg grating sensor is explained, followed by the introduction of sensor installation in the field. Then, a three-dimensional finite element pavement model subjected to a non-uniform moving load was established to validate the dynamic response measurement on site. Finally, based on a comprehensive analysis including a pavement condition survey, numerical simulation, and strain measurement, the rutting mechanism of heavy-duty asphalt pavement in Beijing is discussed. The results show that the occurrence of shear deformation within asphalt layers results in the rutting development, in which material weakness, modulus mismatch of asphalt layers, and heavy-duty characteristics play important roles. Optimizing asphalt layers' moduli, i.e., making them match, might make pavement bear the applied loading with integrity, thus averting the occurrence of excessive local strain, i.e., rutting.
Download or read book Functional Pavement and Advanced Material Testing Technology written by Han-Cheng Dan and published by Frontiers Media SA. This book was released on 2023-02-07 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions of Pavement Structural Layers to Rutting of Hot Mix Asphalt Pavements written by Thomas D. White and published by Transportation Research Board. This book was released on 2002 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Behavior of Asphalt Pavements written by Lijun Sun and published by Butterworth-Heinemann. This book was released on 2016-08-09 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Evaluation of Rutting Potential in Asphalt Mixes Using Finite Element Modeling written by and published by . This book was released on 2003 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quality of asphalt mix (HMA) is one of the main factors that affects the flexible pavement performance. Use of poor quality mix and finding their consequences through pavement performance evaluation is often too costly. Therefore, the remedy is to evaluate the quality of the mix at the design stage of a project. In recent years, performance-based testing has gained popularity so that problematic mixes can be identified and eliminated. Asphalt Pavement Analyzer (APA) has been successfully used in recent years for evaluation of permanent deformation or rutting in both hot mix and cold mix asphalt specimens. In view of layered pavement systems encountered in practice, three-dimensional finite element models (FEM) can be used to relate the APA test results with the in-service performance of the pavement. The primary objectives of this study are to develop a finite element model to simulate the laboratory testing of asphalt mixes in APA for rutting and to relate the test results to basic material properties. For the covering abstract of this conference see ITRD number E211395.
Download or read book Analysis of Pavement Structures written by Animesh Das and published by CRC Press. This book was released on 2023-05-31 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of Pavement Structures brings together current research and existing knowledge on the analysis and design of pavements and introduces load and thermal stress analyses of asphalt and concrete pavement structures in a simple and step-by-step manner. For the second edition of this book, a new chapter on numerical implementation (using FEM) of pavement analysis is added along with topics such as mechanical modeling of granular materials, applications of convolution theorems in visco-elasticity, visco-elastic Poisson’s ratio, concepts of fracture mechanics in relation to fatigue of asphalt mix, solution of semi-infinite and so forth. New solved examples and schematic diagrams are also added. Features: Presents a simple, step-by-step approach for pavement analysis including systematic compilation of research work in the area Discusses further elaborations in terms of extended analytical formulations on some selected topics Includes new chapter on finite element analysis for pavement structures Contains more solved examples to understand the concepts better Explores primary application of pavement analysis in pavement thickness design This book is aimed at graduate students, structural mechanics researchers, and senior undergraduate students in civil/pavement/highway/transport engineering.
Download or read book Micromechanical and Probabilistic Approaches to Improve Asphalt Concrete Rutting Performance Prediction Procedures written by Erdem Coleri and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rutting is the load induced permanent deformation of pavements with asphalt concrete (AC) layers. Rutting can occur in the unbound layers of the pavement and in the AC surface layers, the latter of which is the focus of this thesis. The risk of rutting in the AC layers is highest just after construction and then generally diminishes as the materials harden due to traffic and environmental aging. AC rutting has a large impact on life cycle cost because it mostly occurs at the beginning of the life cycle and because failure by rutting often requires removal and replacement of the affected layers or other costly remedial construction, which makes rutting a crucial consideration. Although rutting performance of AC pavements has been characterized by various studies, there has been little study of the effects of AC micromechanical structure on in-situ rutting deformation accumulation mechanisms. In addition, the analysis of the predicted pavement performance variability and the development of a reliability-based design method considering all significant sources of variability have been lacking. The goal of this thesis was to explain the rutting accumulation mechanisms for pavements with conventional and modified asphalt mixes and develop a comprehensive rutting performance prediction procedure considering the fundamental material properties, in-situ deformation accumulation mechanisms and the effects of various sources of variability, based on investigation of the fundamental problems in current test methods, structural models and performance prediction procedures. An innovative method was developed to quantify the precision and bias in repeated simple shear test at constant height (RSST-CH) laboratory test results for specimens with different dimensions and to determine the effects of variability on predicted rutting performance. Specimen size requirements for two different asphalt mix types were proposed based on the results of the analysis. The effects of test temperature and specimen volume on test variability were also investigated. A reliability based rutting performance prediction procedure was developed that considers the variability in laboratory test results, layer thicknesses, stiffnesses, and measured in-situ performance. The effects of input design parameter variability on predicted performance were determined using the calculated distributions of calibration coefficients. By using these calibration coefficient distributions, asphalt layer design thicknesses for different reliability levels can be predicted without performing computationally intensive calculations, such as Monte Carlo simulations, facilitating incorporation of reliability into design software. The general procedure developed for specific tests and AC rutting in this thesis can be applied to other distresses. The use of X-ray computed tomography (CT) images was extended from previous work in a new empirical approach developed to investigate the changes in AC microstructure caused by full-scale accelerated pavement testing with a Heavy Vehicle Simulator (HVS), by using images taken before and after HVS rut tests. A viscoelastic micromechanical finite element model was also developed to investigate effects of binder and aggregate properties on shear resistance using the microstructural model developed from the imaging process with laboratory specimens. The approach was used to investigate the differences in performance under full-scale loading of two mixes, one dense graded with polymer modified binder and the other gap-graded with rubberized binder. It was found that shear related deformation appeared to control the long term rutting performance of the AC pavement layers while densification was primarily an initial contributor at the very early stages of the trafficking. A high concentration of aggregate interlock in the polymer modified mix, as a result of the dense gradation and larger aggregate sizes, appears to have resulted in greater dissipation of shear stresses and therefore greater shear resistance. The lack of this interlocking effect for the rubberized gap-graded mix is proposed to have caused the earlier failure in the full-scale HVS test sections. Important differences in aggregate movement and air-void changes were also observed between different overlay thicknesses indicating the depth of the rut phenomenon, important information for the design of overlays on aged AC as well as for asphalt overlays on concrete pavements. Recommendations are proposed to improve design and construction of asphalt surfaced pavements based on these findings.
Download or read book A Study on Rutting Prediction of the Asphalt Pavement for Orthotropic Steel Bridge Decks written by Ling Cong and published by . This book was released on 2009 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper establishes a finite element method (FEM) model to predict rutting development of a double-layered pavement system with stone mastic asphalt as its upper layer and mastic asphalt as its bottom layer, which is widely used in orthotropic steel bridge paving. In addition, it presents the influence of pavement thickness and overloading on rutting occurring in the pavement of an orthotropic steel bridge. The results show that the MA layer contributes to an overwhelming majority of permanent deformation; furthermore, within a certain range, rutting depth increases rapidly with the rise of pavement thickness. Finally, a circular road tracking test was conducted to verify the FEM prediction. The comparison between test results and FEM results shows that the model is accurate. The results of this study can be used as reference for the design of pavement on steel decks.
Download or read book Using Image based Multi scale Finite Element Model to Predict Rutting Behavior of Asphalt Mixtures written by Cheng Ling and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rutting resistance is one of the essential needs in design of asphalt mixtures. Volumetric properties, and wheel tracking tests are used today to qualify the rutting resistance in practice. However, these tools are used on a trial and error basis and are mostly based on experience. With all the experience available today it is still not clear what is the contribution of aggregate structure and if plastomeric or elastomeric modifiers are preferred for better resistance. While expanding the types of aggregates and binders used in testing could help, a more fundamental understanding of how aggregate contacts are formed and how binders can contribute to actual mechanics of rutting resistance is a better path for designing of mixtures. In the last decade significant improvement in imaging and multi-scale modeling has been achieved, which allows looking closer at how binders and aggregates could affect rutting resistance. One of the most challenging aspects of this modeling effort is dealing with aggregates proximity zones and how response of mixture changes when aggregates come into contact. This dissertation includes a modification of an Image-based Finite Element model for addressing this challenge and provide a solution that is simple yet effective in better simulating of rutting resistance of asphalt mixtures. The dissertation also includes validation of the model to simulate measured performance of mixtures produced with plastomeric and elastomeric modifiers with different viscoelastic properties, as well as different aggregate gradations. Results indicate that predefined contact points are necessary for reliable prediction of rutting resistance of mixtures. The results also show that the non-recoverable creep compliance of binders plays a significant role, while elasticity of modified binder is not important. Further application of the model shows that it can be successfully used to simulate effects of mixture confining pressure to simulate pavement depth, and also to simulate effects of varying voids content and moisture damage due to the weakening of the interface bond between aggregates and binder. It is expected that the improved modeling of contact zones will allow a more rational selection of aggregates and modification techniques to enhance the rutting resistance of asphalt pavement.
Download or read book The Development of Asphalt Mix Creep Parameters and Finite Element Modeling of Asphalt Rutting written by Ludomir Uzarowski and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data Analysis in Pavement Engineering written by Qiao Dong and published by Elsevier. This book was released on 2023-11-06 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data Analysis in Pavement Engineering: Theory and Methodology offers a complete introduction to the basis of the finite element method, covering fundamental theory and worked examples in the detail required for readers to apply the knowledge to their own engineering problems and understand more advanced applications. This edition sees the significant addition of content addressing coupling problems, including Finite element analysis formulations for coupled problems; Details of algorithms for solving coupled problems; and Examples showing how algorithms can be used to solve for piezoelectricity and poroelasticity problems. Focusing on the core knowledge, mathematical and analytical tools needed for successful application, this book represents the authoritative resource of choice for graduate-level students, researchers and professional engineers involved in finite element-based engineering analysis. This book is the first comprehensive resource to cover all potential scenarios of data analysis in pavement and transportation infrastructure research, including areas such as materials testing, performance modeling, distress detection, and pavement evaluation. It provides coverage of significance tests, design of experiments, data mining, data modeling, and supervised and unsupervised machine learning techniques. It summarizes the latest research in data analysis within pavement engineering, encompassing over 300 research papers. It delves into the fundamental concepts, elements, and parameters of data analysis, empowering pavement engineers to undertake tasks typically reserved for statisticians and data scientists. The book presents 21 step-by-step case studies, showcasing the application of the data analysis method to address various problems in pavement engineering and draw meaningful conclusions.
Download or read book Research on Design Method for Heavy Duty Asphalt Pavements and Its Application written by Lijun Sun and published by . This book was released on 2012 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Premature damage is currently the main problem with heavy-duty asphalt pavements. In order to decrease such premature damage, it is necessary to develop a new design system meeting the requirements of heavy-duty pavements. Based on considerable field investigations and mechanistic analysis, a five-phase design procedure, including data collection, structural combination design, structural thickness design, material testing and examination, and a final decision, was established. The procedure is a comprehensive design tool employing performance-related structural design consideration and mechanistic-based material design consideration that can link performance analysis, structural design, and material design (tests). After consideration of the extensive pavement performance data collected and subsequent analysis, relevant design equations and design criteria were proposed, including whole life asphalt pavement structural behavior equations, life cycle cost analysis models, field fatigue equations, and a shear-based rutting prediction model. As research progressed, test roads and pilot roads were constructed in ten provinces of China, and the first test road has been used successfully for 15 years.
Download or read book Flexible Pavement Analysis by the Three dimentsional Finite Element Method written by John B. Palmerton and published by . This book was released on 1973 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non linear Finite Element Analysis of Road Pavements written by B. Vuong and published by . This book was released on 1986 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Simulation of Vehicle Dynamic Effects on Road Pavements Final Report written by J. K. Hendrick and published by . This book was released on 1992 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanics of Asphalt Microstructure and Micromechanics written by Linbing Wang and published by McGraw Hill Professional. This book was released on 2010-10-08 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: A State-of-the-Art Guide to the Mechanics of Asphalt Concrete Mechanics of Asphalt systematically covers both the fundamentals and most recent developments in applying rational mechanics, microstructure characterization methods, and numerical tools to understand the behavior of asphalt concrete (AC). The book describes the essential mathematics, mechanics, and numerical techniques required for comprehending advanced modeling and simulation of asphalt materials and asphalt pavements. Filled with detailed illustrations, this authoritative volume provides rational mechanisms to guide the development of best practices in mix design, construction methods, and performance evaluation of asphalt concrete. Mechanics of Asphalt covers: Fundamentals for mathematics and continuum mechanics Mechanical properties of constituents, including binder, aggregates, mastics, and mixtures Microstructure characterization Experimental methods to characterize the heterogeneous strain field Mixture theory and micromechanics applications Fundamentals of phenomenological models Multiscale modeling and moisture damage Models for asphalt concrete, including viscoplasticity, viscoplasticity with damage, disturbed state mechanics model, and fatigue failure criteria Finite element method, boundary element method, and discrete element method Digital specimen and digital test-integration of microstructure and simulation Simulation of asphalt compaction Characterization and modeling of anisotropic properties of asphalt concrete
Download or read book Heavy Vehicle Axle Study Framework for Pavement Performance Monitoring written by Neill Allen Belk and published by . This book was released on 2010 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two primary failure mechanisms for flexible pavement include rutting or fatigue cracking. A major thoroughfare within Charlotte, NC was instrumented with traffic load and climatic instrumentation. Earth pressure cells (EPCs), asphalt strain (ASG), and soil compression gages (SCG) were placed in the newly constructed pavement sections along with temperature and moisture probes to monitor potential rutting and fatigue cracking damages from heavy axle vehicles, and also to collect response data that may be used in calibration of the new Mechanistic-Empirical Pavement Design Guide (M-EPDG) which uses regional data in determining the adequacy of newly designed pavements. EVERSTRESS 5.0 and ABAQUS FE were used to statically model the Charlotte city standard for arterial pavement sections and estimate failure distresses within the pavement. Control testing of the sensors with maintenance vehicles, a transit bus, and a crane revealed that the EPCs provided reliable results; however, the ASG and SCGs were recording at noise level. After post analysis, it was determined that the sensors were not being powered adequately and the terminal box was not electrically grounded. Remedial efforts have shown that using a separate power supply provides enough power to the sensors to function properly. Finite element modeling within ABAQUS provided close estimates of in field testing; however, the model should incorporate the visco-elastic properties of the HMA layer material and dynamic loading to accurately model the pavement sections. The control test should be repeated with a separate power supply and a new data acquisition system.
