Discrete Element Modeling Of Influences Of Aggregate Gradation And Aggregate Properties On Fracture In Asphalt Mixes PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Discrete Element Modeling Of Influences Of Aggregate Gradation And Aggregate Properties On Fracture In Asphalt Mixes PDF full book. Access full book title Discrete Element Modeling Of Influences Of Aggregate Gradation And Aggregate Properties On Fracture In Asphalt Mixes.
Author | : Enad Muhib Ahmad Mahmoud |
Publisher | : |
Total Pages | : |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Discrete Element Modeling of Influences of Aggregate Gradation and Aggregate Properties on Fracture in Asphalt Mixes Book in PDF, ePub and Kindle
Aggregate strength, gradation, and shape play a vital role in controlling asphalt mixture performance. Many studies have demonstrated the effects of these factors on asphalt mixture performance in terms of resistance to fatigue cracking and rutting. This study introduces numerical and analytical approaches supported with imaging techniques for studying the interrelated effects of aggregate strength, gradation, and shape on resistance of asphalt mixtures to fracture. The numerical approach relies on the discrete element method (DEM). The main advantage of this approach is the ability to account for the interaction between the internal structure distribution and aggregate properties in the analysis of asphalt mixture response and performance. The analytical approach combines aggregate strength variability and internal force distribution in an asphalt mixture to predict the probability of aggregate fracture. The numerical and analytical approaches were calibrated and verified using laboratory tests on various aggregate types and mixtures. Consequently these approaches were used to: (1) determine the resistance of various mixture types with different aggregate properties to fracture, (2) study the effects of aggregate strength variability on fracture, (3) quantify the influence of blending different types of aggregate on mixture strength, (4) develop a mathematical expression for calculating the probability of aggregate fracture within asphalt mixture, and (5) relate cracking patterns (cohesive: aggregate - aggregate and matrix - matrix, and adhesive: aggregate - matrix) in an asphalt mixture to internal structure distribution and aggregate properties. The results of this dissertation established numerical and analytical techniques that are useful for developing a virtual testing environment of asphalt mixtures. Such a virtual testing environment would be capable of relating the microscopic response of asphalt mixtures to the properties of the mixture constituents and internal structure distribution. The virtual testing environment would be an inexpensive mean to evaluate the influence of changing different material and design factors on the mixture response.
Author | : Sadjad Pirmohammad |
Publisher | : Springer Nature |
Total Pages | : 229 |
Release | : 2020-02-18 |
Genre | : Technology & Engineering |
ISBN | : 3030399745 |
Download Fracture Behavior of Asphalt Materials Book in PDF, ePub and Kindle
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.
Author | : Richard C. Meininger |
Publisher | : ASTM International |
Total Pages | : 355 |
Release | : 1992 |
Genre | : Aggregates (Building materials) |
ISBN | : 0803114680 |
Download Effects of Aggregates and Mineral Fillers on Asphalt Mixture Performance Book in PDF, ePub and Kindle
Resulting from the Symposium on [title], held in December 1991, at the ASTM Standardization Meetings in San Diego, this volume comprises 19 papers in four sections: aggregates; mineral fillers; mixture evaluation; and fatigue, modeling, and theoretical. Member price, $52. Annotation copyright Book N
Author | : Erol Tutumluer |
Publisher | : CRC Press |
Total Pages | : 1560 |
Release | : 2009-06-15 |
Genre | : Technology & Engineering |
ISBN | : 0203865286 |
Download Bearing Capacity of Roads, Railways and Airfields, Two Volume Set Book in PDF, ePub and Kindle
Bearing Capacity of Roads, Railways and Airfields focuses on issues pertaining to the bearing capacity of highway and airfield pavements and railroad track structures and provided a forum to promote efficient design, construction and maintenance of the transportation infrastructure. The collection of papers from the Eighth International Conference
Author | : Allex E. Alvarez |
Publisher | : |
Total Pages | : 96 |
Release | : 2010 |
Genre | : Pavements, Porous |
ISBN | : |
Download Addressing Safety Through Evaluation and Optimization of Permeable Friction Course Mixtures Book in PDF, ePub and Kindle
Author | : Huanan Yu |
Publisher | : |
Total Pages | : |
Release | : 2012 |
Genre | : |
ISBN | : 9781267673350 |
Download Design and Characterization of Asphalt Mixtures Based on Particle Packing and Mechanical Modeling Book in PDF, ePub and Kindle
Existing asphalt mixture design approaches are mainly empirical based "trial-and-error" methods. Based purely on volumetrics, such design methods have little consideration of the mechanical performance of the mixtures. With the trend of moving the pavement research into more mechanistic based methods and targeting the ultimate goal to good field performance, it is necessary to develop a sophisticated mix design and characterization methodology which can help the designer understand the expected engineering performance of the mix at the early stages, at the same time, to have a more efficient tool to evaluate the quality of the mixtures. This research develops a comprehensive aggregate gradation and asphalt mixture design method that estimates the mechanical properties of the mix at early stage. In this method, strong correlations between aggregate properties, volumetrics, and mechanical properties are identified, making the VMA (Voids in Mineral Aggregate) an excellent media to link the properties of aggregates and asphalt binder to their engineering performance. The concept of the design procedure, especially the aggregate gradation design procedure, is largely based on an analysis of aggregate packing and interlocking. As a fast and convenient design method that emphasizes more on the mechanical performance of the mix, the new design method can be used to evaluate the quality of an existing gradation and mix design, and adjust the gradation of a new mix to satisfy both volumetrics and mechanical properties. In addition, the characteristics of asphalt mixture are studied using micromechanical based discrete element method (DEM) and macromechanical modeling. In DEM simulation, an image based ball clumping technique is used for simulating the angularity properties of aggregate particles. The DEM model is established and calibrated to describe the viscoelastic (dynamic modulus and phase angle) and viscoelastic plastic (strength) properties of asphalt mixtures with or without damage involved. As for macromechanical modeling, a constitutive model for characterizing the permanent deformation of asphalt mixture is explored by taking consideration of the directional distribution of aggregates (anisotropy), and the damage induced by plasticity.
Author | : A. Nikolaides |
Publisher | : CRC Press |
Total Pages | : 884 |
Release | : 2015-07-28 |
Genre | : Technology & Engineering |
ISBN | : 1315668165 |
Download Bituminous Mixtures and Pavements VI Book in PDF, ePub and Kindle
Bituminous Mixtures and Pavements contains 113 accepted papers from the 6th International ConferenceBituminous Mixtures and Pavements (6th ICONFBMP, Thessaloniki, Greece, 10-12 June 2015). The 6th ICONFBMP is organized every four years by the Highway Engineering Laboratory of the Aristotle University of Thessaloniki, Greece, in conjunction with
Author | : Brian D. Prowell |
Publisher | : Transportation Research Board |
Total Pages | : 101 |
Release | : 2005 |
Genre | : Technology & Engineering |
ISBN | : 0309088259 |
Download Aggregate Properties and the Performance of Superpave-designed Hot Mix Asphalt Book in PDF, ePub and Kindle
Author | : Randolph C. Ahlrich |
Publisher | : |
Total Pages | : 464 |
Release | : 1995 |
Genre | : Aggregates (Building materials) |
ISBN | : |
Download Influence of Aggregate Gradation and Particle Shape/texture on Permanent Deformation of Hot Mix Asphalt Pavements Book in PDF, ePub and Kindle
Author | : Samer Hassan Dessouky |
Publisher | : |
Total Pages | : 146 |
Release | : 2005 |
Genre | : Aggregates (Building materials) |
ISBN | : |
Download Mechanistic Model to Predict the Impact of the Aggregate Matrix on the Permanent Deformation of Asphalt Mixtures Book in PDF, ePub and Kindle
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 aggregate particles present in the mix, the directional distribution of aggregates, 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 aggregate microstructure distribution features. This report presents the development of elastic and visco-plastic models that account for important aspects of the aggregate and microstructure distribution in modeling the macroscopic behavior of HMA. The objective of Project 0-1707 is to develop tools by which engineers can judge the impact of the aggregate on the performance of HMA based on simple and repeatable tests. Of greatest concern in Project 0-1707 is the ability of the HMA to resist permanent deformation or to rut, which leads to safety concerns, especially under wet surface conditions. In this report, the research team develops an approach is developed to introduce a length scale to the elasticity constitutive relationship in order to capture the influence of aggregate particle sizes on HMA response. A finite element (FE) analysis is used to analyze the microstructure response and predict the macroscopic properties of HMA. Each point in the microstructure is assigned effective local properties that are calculated using an analytical micromechanical model that captures the influence of the number of particles on the microscopic response of the 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 . 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 project simulates experimental data and pavement section.