Evaluation Of Asphalt Binder And Asphalt Mixture Healing Based On Visco Elastic Continuum Damage Theory
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Evaluation Of Asphalt Binder And Asphalt Mixture Healing Based On Visco Elastic Continuum Damage Theory
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Author : Amirmohammad Bahadori
language : en
Publisher:
Release Date : 2020
Evaluation Of Asphalt Binder And Asphalt Mixture Healing Based On Visco Elastic Continuum Damage Theory written by Amirmohammad Bahadori and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Pavements, Asphalt categories.
Fatigue cracking of asphalt pavements is one of the main distresses that reduces the serviceability of roads. The prediction of fatigue cracking in pavements is carried out using laboratory tests and mechanistic models. However, such predictions usually underestimate observed field performance. Their inability to suitably account for the self-healing capability of asphalt pavements is one of the key sources of the variation. This study presents a novel test method and a healing index based on Visco-Elastic Continuum Damage (VECD) theory to quantify the self-healing capacity of asphalt binders and mixes. The proposed asphalt binder healing test is a modification of the conventional Linear Amplitude Sweep (LAS) test, which not only considers the effect of rest periods but also minimizes the number of specimens required for the comprehensive analysis.A healing index based on released pseudo strain energy was developed to quantify the healing of asphalt binder and mixes. The analyses of healing indices for asphalt binders show that softer binders have better healing capacity at low damage levels. On the other hand, binders with higher performance grade have better healing capacity at higher damage levels. An increase in rest period duration was found to increase the healing index of asphalt binder. But the sensitivity of the healing index to the duration of rest periods decreased with damage accumulation. Studies conducted on the surface energy and intrinsic healing parameters of asphalt binder showed that the non-polar Lifshitz0́3van der Waals component of the surface energy correlated well with the healing of asphalt binder.In addition, stress-controlled fatigue tests with rest periods were used to study the healing of asphalt mixtures. The results showed that an increase in temperature and rest period duration enhanced the healing of asphalt mixes. Finally, the rest period, temperature, material integrity level, and surface energy of the asphalt binder were used to develop a phenomenological-based healing prediction model. It was verified on the healing results of a sample mix. The results of the statistical analysis of the variables demonstrated that the temperature had the highest effect on the healing of asphalt mixes.
Fatigue Evaluation Of Asphalt Mixtures Using Dissipated Energy And Viscoelastic Continuum Damage Approaches
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Author :
language : en
Publisher:
Release Date : 2004
Fatigue Evaluation Of Asphalt Mixtures Using Dissipated Energy And Viscoelastic Continuum Damage Approaches written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Fatigue Performance Evaluation Of Westrack Asphalt Mixtures Using Viscoelastic Continuum Damage Approach
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Author : Y. Richard Kim
language : en
Publisher:
Release Date : 2002
Fatigue Performance Evaluation Of Westrack Asphalt Mixtures Using Viscoelastic Continuum Damage Approach written by Y. Richard Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Asphalt concrete categories.
Introduction -- Objectives and summary -- Theoretical background -- Test methods -- Materials and specimen fabrication -- Uniaxial testing -- Determination of viscoelastic properties from IDT test -- Development of a simple performance test and validation -- Conclusions and recommendations -- Implementation and technology transfer plan -- References -- Appendices.
Fracture Properties And Fatigue Cracking Resistance Of Asphalt Binders
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Author : Arash Motamed
language : en
Publisher:
Release Date : 2012
Fracture Properties And Fatigue Cracking Resistance Of Asphalt Binders written by Arash Motamed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Asphalt categories.
Several different types of modifiers are increasingly being used to improve the performance of asphalt binders or to achieve desired mixture production characteristics (e.g., Warm Mix Asphalt). However, current Superpave performance specifications do not accurately reflect the performance characteristics of these modified binders. The main objective of this study was to evaluate the inherent fatigue cracking resistance of asphalt binders in the form of a matrix with rigid particle inclusions. The underlying rationale for this approach was to subject the binders to a state of stress that is similar to the one in a full asphalt mixture. This was achieved by fabricating and testing composite specimens of the asphalt binders and glass beads with a specified gradation. Four asphalt binders with similar true temperature grades but different modifiers were used in this study. The viscoelastic and fatigue cracking characteristics of the binders were measured using the glass bead-binder composite specimens in a dynamic shear rheometer at an intermediate temperature. The results demonstrate that the four asphalt binders modified using different methods had different damage characteristics despite the fact that these four binders were rated to have a similar performance grade based on the Superpave specifications. Fatigue cracking characteristics of the glass bead-binder test specimens used in this study were qualitatively very similar to the fatigue cracking characteristics of full asphalt mixtures using the same binders. The rank order of fatigue cracking resistance for the four glass bead-binder mixtures compared reasonably well to the rank order of fatigue cracking resistance for the full asphalt mixtures that incorporated these asphalt binders.
Implementation And Validation Of The Viscoelastic Continuum Damage Theory For Asphalt Mixture And Pavement Analysis In Brazil
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Author : Luis Alberto Herrmann do Nascimento
language : en
Publisher:
Release Date : 2015
Implementation And Validation Of The Viscoelastic Continuum Damage Theory For Asphalt Mixture And Pavement Analysis In Brazil written by Luis Alberto Herrmann do Nascimento and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Fracture And Viscoelastic Properties Of Asphalt Binders During Fatigue And Rest Periods
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Author : Shihui Shen
language : en
Publisher:
Release Date : 2014
Fracture And Viscoelastic Properties Of Asphalt Binders During Fatigue And Rest Periods written by Shihui Shen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Asphalt binder categories.
Viscoelastic asphalt binder plays an important role in bonding individual aggregate particles and contributes to the durability and stability of asphalt pavement. When asphalt binder is subjected to cyclic loading, deformation and fracture may develop simultaneously within it, leading to the deterioration of material properties and eventually fatigue failure. Research has found that some degree of recovery may develop if rest periods are applied after fatigue deterioration. However, it is not clear whether such recovery is caused by fracture healing, viscoelastic recovery, or both. This paper presents an analysis to differentiate the contributions of fracture healing and viscoelastic recovery to the asphalt binder during rest periods. It also evaluates the damage caused by deformation and fracture during a fatigue process. It is found that viscoelastic recovery plays an important role in the instant increase in the dynamic shear modulus at the beginning of the rest period. The effect of fracture healing on dynamic shear modulus recovery is more dominant in the long term. A healing index is developed based only on the fracture healing of asphalt binder, excluding the effect of viscoelastic recovery. It can be used to evaluate the true healing properties of different asphalt binders.
Proceedings Of The Rilem International Symposium On Bituminous Materials
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Author : Hervé Di Benedetto
language : en
Publisher: Springer Nature
Release Date : 2021-09-25
Proceedings Of The Rilem International Symposium On Bituminous Materials written by Hervé Di Benedetto and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-09-25 with Technology & Engineering categories.
This volume highlights the latest advances, innovations, and applications in bituminous materials and structures and asphalt pavement technology, as presented by leading international researchers and engineers at the RILEM International Symposium on Bituminous Materials (ISBM), held in Lyon, France on December 14-16, 2020. The symposium represents a joint effort of three RILEM Technical Committees from Cluster F: 264-RAP “Asphalt Pavement Recycling”, 272-PIM “Phase and Interphase Behaviour of Bituminous Materials”, and 278-CHA “Crack-Healing of Asphalt Pavement Materials”. It covers a diverse range of topics concerning bituminous materials (bitumen, mastics, mixtures) and road, railway and airport pavement structures, including: recycling, phase and interphase behaviour, cracking and healing, modification and innovative materials, durability and environmental aspects, testing and modelling, multi-scale properties, surface characteristics, structure performance, modelling and design, non-destructive testing, back-analysis, and Life Cycle Assessment. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster new multidisciplinary collaborations.
Investigation Of The Fracture Healing And Mechanism Of Asphalt Binders
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Author : Xin Lu
language : en
Publisher:
Release Date : 2013
Investigation Of The Fracture Healing And Mechanism Of Asphalt Binders written by Xin Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
This research will provide significant contribution to the advancement of the healing study by recognizing the fracture healing of asphalt binders and developing preliminary study of healing mechanism using molecular dynamics simulation.
Evaluation Of Healing And Constitutive Modeling Of Asphalt Concrete By Means Of The Theory Of Nonlinear Viscoelasticity And Damage Mechanics
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Author : Youngsoo Richard Kim
language : en
Publisher:
Release Date : 1988
Evaluation Of Healing And Constitutive Modeling Of Asphalt Concrete By Means Of The Theory Of Nonlinear Viscoelasticity And Damage Mechanics written by Youngsoo Richard Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Asphalt concrete categories.
Viscoelastic Analysis And Fatigue Characterization Of Bituminous Materials In Two Length Scales Under The Influene Of Aging
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Author : Santosh Reddy Kommidi
language : en
Publisher:
Release Date : 2017
Viscoelastic Analysis And Fatigue Characterization Of Bituminous Materials In Two Length Scales Under The Influene Of Aging written by Santosh Reddy Kommidi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Fatigue cracking in asphalt concrete (AC) is of immense importance to pavement design and analysis because it is one of the most important forms of distress that can lead to structural failure in pavement. Once started, these types of cracks can be combined with other environmental factors leading to detrimental effects such as faster rates of pavement deterioration and shortened pavement life and functionality. Currently AASHTO TP101, also known as linear amplitude sweep (LAS) specification, is being widely used to evaluate the ability of an asphalt binder to resist fatigue. The LAS method, although mechanistic in its approach, has certain drawbacks. First, the test is performed on an aged 2-mm thick binder sample, which in reality may never exist in the AC where there is a varying non-uniform thickness of the binder across the components of the AC. Secondly, the test methodology predicts an increased fatigue resistance at lower strain levels of load when the binder ages. This is in contrast to the general belief among researchers that aging is one of the primary contributors to the acceleration of pavement cracking. This study aims to evaluate fatigue resistance in a more realistic approach that is more likely to exist in AC by incorporating sand asphalt mixtures. First, the linear viscoelastic properties of binder and sand asphalt mixture samples were evaluated to obtain the material properties under the influence of aging. Later, the fatigue tests on the sand asphalt mixture were investigated to understand the influence of a thin film of binder on the fatigue resistance. It was observed that based energy dissipation criterion for the binder evaluated a reasonable estimate for fatigue damage at relatively lower temperatures, but was limited to capture the influence of aging. Moreover, it was observed that fatigue testing on a binder at an intermediate temperature of 25 °C could cause edge effects to dominate as seen in the plateau regime for the phase angle in the time sweep tests. In order to overcome the edge effects in the binder LAS tests, the sand asphalt mixture testing was used for analyzing the binder fatigue resistance. Sand asphalt mixture testing could capture the microcracking and macrocracking phases more distinctively when compared to binder testing. In the case of pressure aging vessel (PAV) aged samples, it was observed that the macrocracking phase disappeared and was replaced by sudden changes in the material properties, indicating that the PAV aged mixture was more susceptible to fatigue cracking. By using the simplified viscoelastic continuum damage approach, the fatigue resistance of the binder and sand asphalt mixture was evaluated. The sand asphalt mixture testing was better to capture the influence of aging and changes in the microstructure during fatigue in comparison to binder fatigue tests..