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Author : Zhanping You
Publisher :
ISBN 13 :
Total Pages : 87 pages
Book Rating : 4.:/5 (826 download)
Download or read book Multiscale and Micromechanical Modeling of Asphalt Mixes written by Zhanping You and published by . This book was released on 2011 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Samer Hassan Dessouky
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (617 download)
Download or read book Multiscale Approach for Modeling Hot Mix Asphalt written by Samer Hassan Dessouky and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot mix asphalt (HMA) is a granular composite material stabilized by the presence of asphalt binder. The behavior of HMA is highly influenced by the microstructure distribution in terms of the different particle sizes present in the mix, the directional distribution of particles, the distribution of voids, and the nucleation and propagation of cracks. Conventional continuum modeling of HMA lacks the ability to explicitly account for the effect of microstructure distribution features. This study presents the development of elastic and visco-plastic models that account for important aspects of the microstructure distribution in modeling the macroscopic behavior of HMA. In the first part of this study, an approach is developed to introduce a length scale to the elasticity constitutive relationship in order to capture the influence of particle sizes on HMA response. The model is implemented in finite element (FE) analysis and used to analyze the microstructure response and predict the macroscopic properties of HMA. Each point in the microstructure is assigned effective local properties which are calculated using an analytical micromechanical model that captures the influence of percent of particles on the microscopic response of HMA. The moving window technique and autocorrelation function are used to determine the microstructure characteristic length scales that are used in strain gradient elasticity. A number of asphalt mixes with different aggregate types and size distributions are analyzed in this paper. In the second part of this study, an elasto-visco-plastic continuum model is developed to predict HMA response and performance. The model incorporates a Drucker-Prager yield surface that is modified to capture the influence of stress path direction on the material response. Parameters that reflect the directional distribution of aggregates and damage density in the microstructure are included in the model. The elasto-visco-plastic model is converted into a numerical formulation and is implemented in FE analysis using a user-defined material subroutine (UMAT). A fully implicit algorithm in time-step control is used to enhance the efficiency of the FE analysis. The FE model used in this study simulates experimental data and pavement section.
Author : Linbing Wang
Publisher : McGraw Hill Professional
ISBN 13 : 0071640975
Total Pages : 481 pages
Book Rating : 4.0/5 (716 download)
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
Author : Niki Kringos
Publisher : Springer Science & Business Media
ISBN 13 : 9400768788
Total Pages : 434 pages
Book Rating : 4.4/5 (7 download)
Download or read book Multi-Scale Modeling and Characterization of Infrastructure Materials written by Niki Kringos and published by Springer Science & Business Media. This book was released on 2013-05-26 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: The micro- and nano-modification of infrastructure materials and the associated multi-scale characterization and simulation has the potential to open up whole new uses and classes of materials, with wide-ranging implications for society. The use of multi-scale characterization and simulation brings the ability to target changes at the very small scale that predictably effect the bulk behavior of the material and thus allowing for the optimization of material behavior and performance. The International RILEM Symposium on Multi-Scale Modeling and Characterization of Infrastructure Materials (Stockholm, June 10-12, 2013) brought together key researchers from around the world to present their findings and ongoing research in this field in a focused environment with extended discussion times. From asphalt to concrete, from chemistry to mechanics, from nano- to macro-scale: the collection of topics covered by the Symposium represents the width and depth of the currently ongoing efforts of developing more sustainable infrastructure materials. Researchers, practitioners, undergraduates and graduate students engaged in infrastructure materials or multi-scale characterization and modeling efforts can use this book as a comprehensive reference, to learn about the currently ongoing research efforts in this field or as an inspiration for new research ideas to enhance the long-term performance of infrastructure materials from a fundamental perspective. The Symposium was held under the auspices of the RILEM Technical Committee on Nanotechnology-Based Bituminous Materials 231-NBM and the Transport Research Board (TRB) Technical Committee on Characteristics of Asphalt Materials AFK20.
Download or read book Micromechanics-based Multiscale Lattice Modeling of Fatigue Cracking in Hot Mixed Asphalt written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a novel micromechanics-based lattice procedure designed to characterize the cracking performance of hot mix asphalt (HMA) from its constituent material properties. The approach essentially consists of a series of direct-lattice models integrated with multiscale technique. A typical direct-lattice modeling starts with a preprocessor that discretizes the microstructure of a specimen, which is either physically or virtually fabricated, into a random truss lattice. The mixture performance can be predicted by analyzing such lattice network using a general-purpose finite element program FEP++. The cracking process in HMA is simulated by successive removal of failed links representing microcracks. In this study, a surface energy based failure criterion is developed to trigger the creation and subsequent extension of microcracks. Due to the disparate length scales associated with microcracking and specimen size, the direct-lattice modeling described above would demand unrealistic computational cost for modeling even a laboratory scale HMA specimens. In order to make the procedure more practical, the multiscale approach is implemented. Essentially, multi-scale model considers the effect of different-sized aggregates at different length scales. Such an approach reduces the computational cost significantly, while capturing the mechanical phenomenon at various length scales. Finally, the effectiveness of the proposed multiscale lattice procedure is illustrated by modeling an actual indirect tensile (IDT) test on a thin cylindrical HMA specimen and making quantitative comparisons with experimental measurements, including full-strain fields measured by the digital image correlations (DIC) technique.
Author : Y. Richard Kim
Publisher : McGraw Hill Professional
ISBN 13 : 0071596518
Total Pages : 482 pages
Book Rating : 4.0/5 (715 download)
Download or read book MODELING OF ASPHALT CONCRETE written by Y. Richard Kim and published by McGraw Hill Professional. This book was released on 2007-09-22 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Expert Guide to Developing More-Durable and Cost-Effective Asphalt Pavements Written by distinguished experts from countries around the world, Modeling of Asphalt Concrete presents in-depth coverage of the current materials, methods, and models used for asphalt pavements. Included is state-of-the-art information on fundamental material properties and mechanisms affecting the performance of asphalt concrete, new rheological testing and analysis techniques, constitutive models, and performance prediction methodologies for asphalt concrete and asphalt pavements. Emphasis is placed on the modeling of asphalt mixes for specific geographic/climatic requirements. In light of America's crumbling infrastructure and our heavy usage of asphalt as a paving material, this timely reference is essential for the development of more-durable and cost-effective asphalt materials for both new construction and rehabilitation. Harness the Latest Breakthroughs in Asphalt Concrete Technology: • Asphalt Rheology • Constitutive Models • Stiffness Characterization • Models for Low-Temperature Cracking • Models for Fatigue Cracking and Moisture Damage • Models for Rutting and Aging
Author : Eyad Masad
Publisher :
ISBN 13 :
Total Pages : 87 pages
Book Rating : 4.:/5 (437 download)
Download or read book Micromechanical Characterization and Constitutive Modeling of Asphalt Mixes written by Eyad Masad and published by . This book was released on 2004 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zhanping You
Publisher :
ISBN 13 :
Total Pages : 1024 pages
Book Rating : 4.:/5 (55 download)
Download or read book Development of a Micromechanical Modeling Approach to Predict Asphalt Mixture Stiffness Using the Discrete Element Method written by Zhanping You and published by . This book was released on 2003 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.3/5 (555 download)
Download or read book Modeling of Hot-mix Asphalt Compaction written by and published by . This book was released on 2010 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compaction is the process of reducing the volume of hot-mix asphalt (HMA) by the application of external forces. As a result of compaction, the volume of air voids decreases, aggregate interlock increases, and interparticle friction increases. The quality of field compaction of HMA is one of the most important elements influencing asphalt pavement performance. Poor compaction has been associated with asphalt bleeding in hot weather, moisture damage, excessive aging and associated cracking, and premature permanent deformation. This study was conducted to develop a model within the context of a thermomechanical framework for the compaction of asphalt mixtures. The asphalt mixture was modeled as a nonlinear compressible material exhibiting time-dependent properties. A numerical scheme based on finite elements was employed to solve the equations governing compaction mechanisms. The material model was implemented in the Computer Aided Pavement Analysis (CAPA-3D) finite-element (FE) package. Due to the difficulty of conducting tests on the mixture at the compaction temperature, a procedure was developed to determine the model's parameters from the analysis of the Superpave® gyratory compaction curves. A number of mixtures were compacted in the Superpave® gyratory compactor using an angle of 1.25 degrees in order to determine the model's parameters. Consequently, the model was used to predict the compaction curves of mixtures compacted using a 2-degree angle of gyration. The model compared reasonably well with the compaction curves. FE simulations of the compaction of several pavement sections were conducted in this study. The results demonstrated the potential of the material model to represent asphalt mixture field compaction. The developed model is a useful tool for simulating the compaction of asphalt mixtures under laboratory and field conditions. In addition, it can be used to determine the influence of various material properties and mixture designs on the model's parameters and mixture compactability.
Author :
Publisher :
ISBN 13 :
Total Pages : 87 pages
Book Rating : 4.:/5 (634 download)
Download or read book Micromechanical Characterizattion and Constitutive Modeling of Asphalt Mixes written by and published by . This book was released on 2004 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Minkyum Kim
Publisher :
ISBN 13 : 9781243752802
Total Pages : 268 pages
Book Rating : 4.7/5 (528 download)
Download or read book Development of Differential Scheme Micromechanics Modeling Framework for Predictions of Hot-Mix Asphalt (Hma) Complex Modulus and Experimental Validations. written by Minkyum Kim and published by . This book was released on 2011-09-09 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The viscoelastic modulus of hot-mix asphalt (HMA) such as the complex modulus, E*, is an essential material parameter for better paving mixture design and asphalt pavement design. Under certain circumstances, it is desirable that a reasonable modulus value of certain HMA mixtures be estimated for this purpose. Empirical and semi empirical models have been proposed and used. However, these non-fundamental approaches have significant drawbacks, particularly with application of the model for materials that vary from those used in the calibration of the model, and their reliance on large calibration data sets, which led to introducing some fuzzy factors in their predictions. In order to overcome the limitations of an empirical approach, a fundamental micromechanics modeling framework based on the differential scheme effective medium theory has been developed and introduced herein. To verify and validate the prediction accuracy and applicability, a series of various asphalt-aggregate mixtures starting from the homogeneous asphalt binder phase up to a very highly packed composite of dense HMA mixtures were produced in the lab by progressively increasing the aggregate volume concentration in the composite from 0 to nearly 0.9. These various mixtures were tested in the Hollow Cylinder Tensile Tester (HCT) to obtain the extensional complex modulus (E*) at three low temperatures within -25 to 5C range and at various loading frequencies from 10 Hz to 0.01 Hz. Comparisons between the model predicted E* and the experimental E* showed good agreement with reasonable accuracies. Remaining challenges for the practical implementation of the proposed model such as the applicability at intermediate to high temperature materials property prediction and particle orientation effects were discussed based on the analysis and additional model predictions for an independent experimental data set.
Author : Derek D. Li
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (748 download)
Download or read book Multiscale Modeling of Asphalt Systems Using Quantum Mechanics and Molecular Simulation written by Derek D. Li and published by . This book was released on 2011 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Benjamin Shane Underwood
Publisher :
ISBN 13 :
Total Pages : 573 pages
Book Rating : 4.:/5 (758 download)
Download or read book Multiscale Constitutive Modeling of Asphalt Concrete written by Benjamin Shane Underwood and published by . This book was released on 2011 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michal Šejnoha
Publisher : WIT Press
ISBN 13 : 1845646827
Total Pages : 293 pages
Book Rating : 4.8/5 (456 download)
Download or read book Micromechanics in Practice written by Michal Šejnoha and published by WIT Press. This book was released on 2013 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book will concentrate on the application of micromechanics to the analysis of practical engineering problems. Both classical composites represented by carbon/carbon textile laminates and applications in Civil Engineering including asphalts and masonry structures will be considered. A common denominator of these considerably distinct material systems will be randomness of their internal structure. Also, owing to their complexity, all material systems will be studied on multiple scales. Since real engineering, rather than academic, problems are of the main interest, these scales will be treated independently from each other on the grounds of fully uncoupled multi-scale analysis. Attention will be limited to elastic and viscoelastic behaviour and to the linear heat transfer analysis. To achieve this, the book will address two different approaches to the homogenization of systems with random microstructures. In particular, classical averaging schemes based on the Eshelby solution of a solitary inclusion in an infinite medium represented by the Hashin-Shtrikman variational principles or by considerably simpler and more popular Mori-Tanaka method will be compared to detailed finite element simulations of a certain representative volume element (RVE) representing accommodated geometrical details of respective microstructures. These are derived by matching material statistics such as the one- and two-point probability functions of real and artificial microstructures. The latter one is termed the statistically equivalent periodic unit cell owing to the assumed periodic arrangement of reinforcements (carbon fibres, carbon fibre tows, stones or masonry bricks) in a certain matrix (carbon matrix, asphalt mastic, mortar). Other types of materials will be introduced in the form of exercises with emphases to the application of the Mori-Tanaka method in the framework of the previously mentioned uncoupled multi-scale analysis
Author : Cheng Ling
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (972 download)
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.
Author : Quingli Dai
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.:/5 (624 download)
Download or read book Micromechanical Modeling of Constitutive and Damage Behavior of Heterogeneous Asphalt Materials written by Quingli Dai and published by . This book was released on 2004 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructure Generation of Asphalt Concrete and Lattice Modeling of Its Cracking Behavior Under Low Temperature written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue cracking has been pointed out as a major distress in asphalt concrete (AC) pavements. It is well known that cracking performance in AC mainly depends on the mechanical properties of its constituent materials, namely asphalt binder and aggregates. Study of such dependence is the key to effective characterization of the mechanical behavior of AC. Previous studies predicted AC behavior from the mixture properties using extensive physical experiments. As an alternative approach to physical experiments, micromechanical modeling, which is composed of microstructure generation and numerical modeling, is introduced in this study. Digital imaging processing (DIP) of physical specimens to generate microstructures is first investigated, followed by virtual fabrication, which makes use of the mix properties to virtually fabricate the specimen (or the cross section of specimen for 2D analysis), so that the appearance and mechanical behavior of the actual specimen can be simulated. The resulting microstructure is then processed to obtain a lattice network that is expected to mimic the mechanical behavior of the AC specimen. Lattice modeling approximates a continuum by using a lattice, with each link representing an intact bond that can be broken at any time to create a microcrack. The cracking process is simulated by successive removal of failed links. Due to the unrealistic computational cost of direct simulation, the multi-scale approach is adopted to perform microstructural analysis, which considers the effect of different-sized aggregates at different length scales. Such an approach reduces the computational cost significantly, while capturing the mechanical phenomena at various length scales. The effectiveness of the proposed multi-scale modeling approach is then illustrated by modeling the cracking behavior of the uniaxial tension tests under -10 & deg;C. In the end, the effects of surface energy are studied.
