Investigation Of The Fracture Healing And Mechanism Of Asphalt Binders
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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.
Investigation Of The Microstructural Mechanisms Of Relaxation And Fracture Healing In Asphalt
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Author : Dallas N. Little
language : en
Publisher:
Release Date : 1991
Investigation Of The Microstructural Mechanisms Of Relaxation And Fracture Healing In Asphalt written by Dallas N. Little and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Asphalt categories.
Investigation Of The Microstructural Mechanisms Of Relaxation And Fracture Healing In Asphalt
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Author : Dallas N. Little
language : en
Publisher:
Release Date : 1991
Investigation Of The Microstructural Mechanisms Of Relaxation And Fracture Healing In Asphalt written by Dallas N. Little and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Asphalt categories.
Investigation Of The Microstructural Mechanism Of Relaxation And Fracture Healing In Asphalt
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Author :
language : en
Publisher:
Release Date : 1993
Investigation Of The Microstructural Mechanism Of Relaxation And Fracture Healing In Asphalt written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
Two major research issues are addressed. The first issue is the microstructural components of asphalt cement which influence and/or control relaxation and creep under mechanical loading. The second and allied issue is the identification and evaluation of asphalt cement and asphalt concrete microstructural components that influence and/or control the microdamage (microfracture) healing of asphalt concrete mixtures. A unique approach, for the study of asphalt cement, is used to evaluate the mechanism of relaxation and creep and the microstructural components controlling this mechanism within asphalt cement. This approach involves the study of infrared spectral peak shifts and peak geometry changes due to the application of mechanically-induced stress. This approach is demonstrated to be successful and determines that the primary microstructural component of the asphalt cement related to creep and relaxation deformation is aliphatic appendages to the various molecular species. The nature of these appendages, i.e., shape and length, are strongly related to equilibrium modulus, zero shear viscosity and microdamage healing ... Fracture healing, FTIR, Asphalt, Micromechanisms of fracture asphalt modification, Viscoelastic correspondence principle.
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.
8th Rilem International Conference On Mechanisms Of Cracking And Debonding In Pavements
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Author : Armelle Chabot
language : en
Publisher: Springer
Release Date : 2016-05-25
8th Rilem International Conference On Mechanisms Of Cracking And Debonding In Pavements written by Armelle Chabot and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-05-25 with Technology & Engineering categories.
This book presents the latest advances in research to analyze mechanical damage and its detection in multilayer systems. The contents are linked to the Rilem TC241 - MCD scientific activities and the proceedings of the 8th RILEM International Conference on Mechanisms of Cracking and Debonding in Pavements (MCD2016). MCD2016 was hosted by Ifsttar and took place in Nantes, France, on June 7-9, 2016. In their lifetime, pavements undergo degradation due to different mechanisms of which cracking is among the most important ones. The damage and the fracture behavior of all its material layers as well as interfaces must be understood. In that field, the research activities aims to develop a deeper fundamental understanding of the mechanisms responsible for cracking and debonding in asphalt concrete and composite (e.g. asphalt overlays placed on PCC or thin cement concrete overlay placed on asphalt layer) pavement systems.
Investigation Of The Fracture Resistance Of Asphalt Mixtures At Low Temperatures With A Semi Circular Bend Scb Test
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Author : Xue Li
language : en
Publisher:
Release Date : 2005
Investigation Of The Fracture Resistance Of Asphalt Mixtures At Low Temperatures With A Semi Circular Bend Scb Test written by Xue Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Understanding Mechanisms Leading To Asphalt Binder Fatigue
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Author :
language : en
Publisher:
Release Date : 2012
Understanding Mechanisms Leading To Asphalt Binder Fatigue written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Fatigue cracking is one of the primary modes of failure in asphalt pavements. Cracking typically occurs within the asphalt binder phase of asphalt mixtures. Thus, asphalt binder fatigue resistance is critical in determining overall pavement fatigue performance. One procedure commonly used to characterize asphalt binder fatigue resistance is the time sweep test, which consists of repeated torsional loading of a cylindrical specimen in the Dynamic Shear Rheometer (DSR). Generally, apparent changes in material properties with respect to number of cycles of loading are used to define fatigue failure of the asphalt binder. Results of this test have been shown to correlate well with asphalt mixture fatigue performance. However, the mechanisms responsible for changes in material properties during fatigue testing in the DSR were previously not well understood. Results in this study demonstrate that fracture can account for changes in loading resistance of asphalt binders during time sweep testing. Under cyclic torsional loading of cylindrical specimens, macro fracture is shown to manifest in the form of edge fracture. Edge fracture is a circumferential crack starting at the periphery of a cylindrical sample that propagates inward as loading is applied, reducing the effective sample size. Digital visualization of the fractured specimens allowed for determination of the fractured and intact sample area. Predictions of fracture propagation based on measurements of loading resistance and fracture mechanics concepts agreed favorably with actual measurements based on visualization. Furthermore, the fracture morphology and progression of crack growth of asphalt binders matched those observed for other materials under similar loading conditions.Based on these results, fatigue damage characterization of asphalt binders can be improved by incorporating fracture mechanics into an analysis framework for DSR fatigue test results. An analysis framework based on fracture principles is presented. The proposed model allows predicting fatigue life at any loading amplitude using the results of a single fatigue test. Additionally, it is demonstrated that time-temperature superposition is applicable to fatigue crack propagation of asphalt binders, allowing for efficient prediction of fatigue performance at multiple temperatures. The model is validated using a comparison between asphalt mixture and binder fatigue test results.
Mechanisms Of Cracking And Debonding In Asphalt And Composite Pavements
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Author : William G. Buttlar
language : en
Publisher: Springer
Release Date : 2018-05-26
Mechanisms Of Cracking And Debonding In Asphalt And Composite Pavements written by William G. Buttlar and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-26 with Technology & Engineering categories.
Premature cracking in asphalt pavements and overlays continues to shorten pavement lifecycles and creates significant economic and environmental burden. In response, RILEM Technical Committee TC 241-MCD on Mechanisms of Cracking and Debonding in Asphalt and Composite Pavements has conducted a State-of-the-Art Review (STAR), as detailed in this comprehensive book. Cutting-edge research performed by RILEM members and their international partners is presented, along with summaries of open research questions and recommendations for future research. This book is organized according to the theme areas of TC 241-MCD - i.e., fracture in the asphalt bulk material, interface debonding behaviour, and advanced measurement systems. This STAR is expected to serve as a long term reference for researchers and practitioners, as it contributes to a deeper fundamental understanding of the mechanisms behind cracking and debonding in asphalt concrete and composite pavement systems.
7th Rilem International Conference On Cracking In Pavements
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Author : A. Scarpas
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-08-30
7th Rilem International Conference On Cracking In Pavements written by A. Scarpas and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-30 with Technology & Engineering categories.
In the recent past, new materials, laboratory and in-situ testing methods and construction techniques have been introduced. In addition, modern computational techniques such as the finite element method enable the utilization of sophisticated constitutive models for realistic model-based predictions of the response of pavements. The 7th RILEM International Conference on Cracking of Pavements provided an international forum for the exchange of ideas, information and knowledge amongst experts involved in computational analysis, material production, experimental characterization, design and construction of pavements. All submitted contributions were subjected to an exhaustive refereed peer review procedure by the Scientific Committee, the Editors and a large group of international experts in the topic. On the basis of their recommendations, 129 contributions which best suited the goals and the objectives of the Conference were chosen for presentation and inclusion in the Proceedings. The strong message that emanates from the accepted contributions is that, by accounting for the idiosyncrasies of the response of pavement engineering materials, modern sophisticated constitutive models in combination with new experimental material characterization and construction techniques provide a powerful arsenal for understanding and designing against the mechanisms and the processes causing cracking and pavement response deterioration. As such they enable the adoption of truly "mechanistic" design methodologies. The papers represent the following topics: Laboratory evaluation of asphalt concrete cracking potential; Pavement cracking detection; Field investigation of pavement cracking; Pavement cracking modeling response, crack analysis and damage prediction; Performance of concrete pavements and white toppings; Fatigue cracking and damage characterization of asphalt concrete; Evaluation of the effectiveness of asphalt concrete modification; Crack growth parameters and mechanisms; Evaluation, quantification and modeling of asphalt healing properties; Reinforcement and interlayer systems for crack mitigation; Thermal and low temperature cracking of pavements; and Cracking propensity of WMA and recycled asphalts.