Fracture Modeling Of Asphalt Concrete With Heterogeneous Microstructure
DOWNLOAD
Download Fracture Modeling Of Asphalt Concrete With Heterogeneous Microstructure PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Fracture Modeling Of Asphalt Concrete With Heterogeneous Microstructure book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Fracture Modeling Of Asphalt Concrete With Heterogeneous Microstructure
DOWNLOAD
Author : Jian Wang
language : en
Publisher:
Release Date : 2015
Fracture Modeling Of Asphalt Concrete With Heterogeneous Microstructure written by Jian Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Aggregates (Building materials) categories.
Understanding fracture resistance of asphalt concrete is of great importance in designing pavements with long service life. This thesis focused on studying the micro and global fracture behavior of heterogeneous asphalt concrete with a numerical analysis approach. Finite element (FE) models were built with the capacity of taking heterogeneity into consideration. The asphalt concrete was modeled as a multi-phase material with coarse aggregates and fine aggregate matrix (FAM). Viscoelastic properties were assigned to the FAM. Different damage models were incorporated to study fracture at two length scales: micro-fracture within FAM and coarse aggregate-FAM interface under small displacement and global fracture resistance in the semi-circular bending (SCB) test. For micro-fracture simulation, asphalt mixture was modeled with both adhesive and cohesive failure potential. Two different fracture models, cohesive zone model (CZM) and extended finite element model (XFEM), were adopted to simulate fracture damage within the FAM (cohesive failure) and at the FAM-aggregate interface (adhesive failure), respectively. For global fracture properties, the SCB test was simulated to predict the crack propagation pattern and the load-crack mouth opening displacement (CMOD) curve of asphalt concrete. Parametric studies with different material properties of FAM and coarse aggregates-FAM interface, morphological characteristics of coarse aggregates, and testing conditions (loading rate and temperature) were carried out to study their effects on fracture behavior of asphalt concrete. The numerical models provide an effective method to study fracture mechanism of heterogeneous asphalt concrete and generates meaningful findings. The development of cracking shows that the damage in the FAM material would initiate first at a small displacement and then interconnect with the damage developed at the FAM-aggregate interface. The higher angularity and larger aggregate size induces the greater damage level; while the orientation angle along with aspect ratio has influence on the anisotropic behavior of asphalt concrete. On the other hand, the SCB test simulations show good agreements with experimental results in the literature. Increasing fracture strength and energy of FAM significantly improves fracture resistance of asphalt concrete. The spatial distribution and angularity of coarse aggregate affect crack path; while the gradation and size of coarse aggregate affect fracture strength of asphalt concrete.
Mechanics Of Asphalt Microstructure And Micromechanics
DOWNLOAD
Author : Linbing Wang
language : en
Publisher: McGraw Hill Professional
Release Date : 2010-10-08
Mechanics Of Asphalt Microstructure And Micromechanics written by Linbing Wang and has been published by McGraw Hill Professional this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-10-08 with Technology & Engineering categories.
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
Establishment Of Microstructure Of Asphalt Mixtures Based On Discrete Element Method
DOWNLOAD
Author : Keli Wang
language : en
Publisher:
Release Date : 2014
Establishment Of Microstructure Of Asphalt Mixtures Based On Discrete Element Method written by Keli Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Air voids categories.
For several decades, rutting in asphalt pavements has not been fully addressed or prevented. Study on the microstructure of asphalt concrete may provide a good alternative way to approach a solution. Conventional microstructure modeling based on computed tomography (CT), however, is expensive, time consuming, and specimen destructive. In this paper we present a study on discrete element modeling of asphalt concrete in which the microstructure is described based on the compositional phases. This approach is less expensive, more rapid, nondestructive, and easier to use relative to the CT approach. First, a new algorithm for generating coarse aggregate elements with irregular shapes is developed. It considers the shape and orientation distribution of particles in the microstructure of asphalt concrete. The irregular shapes are created based on the mechanism of sieving analysis. The random distribution of orientations is modeled with a rotation algorithm. Some particular problems such as the issue of "floaters" are solved with an iteration method in the proposed algorithm. Second, the air void phase, which is treated as the second microstructure component of asphalt concrete, is established with a regression model based on data measured from specimens fabricated with a Superpave gyratory compactor. Finally, the developed microstructural model of asphalt concrete is validated with volume fractions of phases in actual asphalt mixture specimens. The results are quite satisfactory.
Fracture Behavior Of Asphalt Materials
DOWNLOAD
Author : Sadjad Pirmohammad
language : en
Publisher: Springer Nature
Release Date : 2020-02-18
Fracture Behavior Of Asphalt Materials written by Sadjad Pirmohammad and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-02-18 with Technology & Engineering categories.
This book discusses the applications of fracture mechanics in the design and maintenance of asphalt concrete overlays. It provides useful information to help readers understand the effects of different material and loading type parameters on the fracture properties of asphalt concretes. It also reviews relevant numerical and experimental studies, and describes in detail design parameters such as aggregate type, air void, loading mode, and additives, based on the authors experience and that of other researchers.
Computational Microstructure Modeling Of Asphalt Mixtures Subjected To Rate Dependent Fracture
DOWNLOAD
Author : Francisco Thiago Sacramento Aragão
language : en
Publisher:
Release Date : 2011
Computational Microstructure Modeling Of Asphalt Mixtures Subjected To Rate Dependent Fracture written by Francisco Thiago Sacramento Aragão and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Asphalt categories.
Polymer Fiber Modified Asphalt Fracture Mechanisms And Microstructure Relationships To Distresses And Environmental Factors
DOWNLOAD
Author : Edward Burton Scott
language : en
Publisher:
Release Date : 1993
Polymer Fiber Modified Asphalt Fracture Mechanisms And Microstructure Relationships To Distresses And Environmental Factors written by Edward Burton Scott and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Pavements, Asphalt concrete categories.
Microstructure Generation Of Asphalt Concrete And Lattice Modeling Of Its Cracking Behavior Under Low Temperature
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2003
Microstructure Generation Of Asphalt Concrete And Lattice Modeling Of Its Cracking Behavior Under Low Temperature written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
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.
Pro 37 5th International Rilem Conference On Cracking In Pavements Mitigation Risk Assessment And Prevention
DOWNLOAD
Author : C. Petit
language : en
Publisher: RILEM Publications
Release Date : 2004
Pro 37 5th International Rilem Conference On Cracking In Pavements Mitigation Risk Assessment And Prevention written by C. Petit and has been published by RILEM Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Pavements categories.
Microstructure Generation Of Asphalt Concrete And Lattice Modeling Of Its Cracking Behavior Under Low Temperature
DOWNLOAD
Author : Pu Zhang
language : en
Publisher:
Release Date : 2003
Microstructure Generation Of Asphalt Concrete And Lattice Modeling Of Its Cracking Behavior Under Low Temperature written by Pu Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Keywords: virtual fabrication, asphalt concrete, lattice.
Investigation Of Toughening Mechanisms In The Fracture Of Asphalt Concrete Using The Clustered Discrete Element Method
DOWNLOAD
Author : Hyunwook Kim
language : en
Publisher: ProQuest
Release Date : 2007
Investigation Of Toughening Mechanisms In The Fracture Of Asphalt Concrete Using The Clustered Discrete Element Method written by Hyunwook Kim and has been published by ProQuest this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Asphalt concrete is a quasi-brittle composite material which is composed of solid inclusions and a viscous matrix. The fracture of heterogeneous solids is a difficult problem to handle numerically due to the creation and continuous motion of new surfaces. A clustered discrete element method (DEM) is employed as a means to investigate fracture mechanisms in asphalt concrete at low temperatures. A bilinear cohesive softening model is implemented into the DEM framework to enable simulation of crack initiation and propagation in asphalt concrete. The meso-scale representation of the morphology of the material is incorporated into the DEM model using high-resolution imaging and image analysis software. The bulk properties and fracture parameters of multi-phase are obtained from experiments and calibration procedure. The two-dimensional clustered DEM method is applied into mode I fracture tests, e.g. disk-shaped compact tension (DC(T)) and single-edge notched beam (SE(B)) tests, to investigate various fracture mechanisms of asphalt concrete. The simulation results are shown to compare favorably with experimental results, and moreover, the simulations provide new insight into the fracture mechanisms in asphalt concrete. The modeling technique provides a physical description of the fracture process zone in laboratory fracture tests, the influence of temperature, effects of material parameters, loading rate dependency, and specimen size effect on fracturing of asphalt concrete. The abilities to simulate mixed-mode fracture, crack competition, distribution of macro- and micro-cracks, and field fracture phenomenon are demonstrated in conjunction with SE(B) and multi-scale pavement fracture models.