Development Of The Simplified Method To Evaluate Dynamic Mechanical Analysis Data On Asphalt Aggregate Mixtures
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Development Of The Simplified Method To Evaluate Dynamic Mechanical Analysis Data On Asphalt Aggregate Mixtures
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Author : Yunus Bin Ab-Wahab
language : en
Publisher:
Release Date : 1993
Development Of The Simplified Method To Evaluate Dynamic Mechanical Analysis Data On Asphalt Aggregate Mixtures written by Yunus Bin Ab-Wahab and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Asphalt concrete categories.
Testing of asphalt binders and asphalt-aggregate mixtures using dynamic mechanical analysis is becoming popular with improvements in high-speed computers, precision equipment, and computer software. Researchers are trying to describe the behavior of asphalt binders and asphalt-aggregate mixtures in terms of their time- and temperature-dependent linear viscoelastic behavior. The objectives of this thesis were to develop a simplified pneumatic test to perform dynamic mechanical analysis (DMA), to evaluate the performance of the pneumatic and hydraulic test systems using the computer software developed to perform DMA tests, and, to develop a simplified method to evaluate the experimental data obtained from DMA tests on aged asphalt-aggregate mixtures. A simplified pneumatic test system was developed to perform DMA. Computer software was also developed to perform DMA testing on both the simplified pneumatic and hydraulic test systems. DMA was performed on both test systems to compare their performance, and on aged asphalt-aggregate mixtures to evaluate the application of the simplified method. The results from the pneumatic and hydraulic test systems show that there is about a 20 percent difference in the complex modulus, especially at high loading frequencies. This is due to the compressibility of the air used in the pneumatic test system. The compressibility of air is greater at warmer temperatures than at cooler temperatures. Therefore, the application of the pneumatic test system to perform dynamic testing should be limited to low frequencies (
Automated Protocol For The Analysis Of Dynamic Mechanical Analyzer Date From Fine Aggregate Asphalt Mixes
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Author : Pedro Cavalcanti De Sousa
language : en
Publisher:
Release Date : 2010
Automated Protocol For The Analysis Of Dynamic Mechanical Analyzer Date From Fine Aggregate Asphalt Mixes written by Pedro Cavalcanti De Sousa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Fatigue cracking and moisture damage are two important modes of distresses in asphalt pavements. Recently, the Dynamic Mechanical Analyzer (DMA) was used to characterize fatigue cracking and evaluate the effects of moisture damage on the Fine Aggregate Matrix (FAM) portion of asphalt mixtures. The FAM specimens should be properly fabricated to represent the composition and structure of the fine portion of the mixture. The objective of the first phase of this study was to develop a standard test procedure for preparing FAM specimens such that it is representative of the mixture. The method consists of preparing loose full asphalt mixtures and sieving through different sizes. Then, the ignition oven was used to determine the binder content associated with the small size materials (passing on sieve #16). Sieve #16 is used to separate fine aggregates from the coarse aggregates. The applicability of this new method will be evaluated using a number of asphalt mixtures. The objective of the second phase of this study was to develop software to analyze the data from DMA test. Such software will enable engineers and researchers to perform the complex analysis in very short time. This is Microsoft Windows ® based software, executable in any hardware configuration under this operational system.
Overlay Design For Unstable Asphalt Mixes
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Author :
language : en
Publisher:
Release Date : 1995
Overlay Design For Unstable Asphalt Mixes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Pavements categories.
Volumetric Requirements For Superpave Mix Design
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Author : Donald W. Christensen
language : en
Publisher: Transportation Research Board
Release Date : 2006
Volumetric Requirements For Superpave Mix Design written by Donald W. Christensen and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Asphalt categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 567: Volumetric Requirements for Superpave Mix Design examines whether changes to the recommended Superpave mix design criteria for voids in mineral aggregate, voids filled with asphalt, and air voids content might further enhance the performance and durability of hot-mix asphalt.
Circular
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Author :
language : en
Publisher:
Release Date : 1992*
Circular written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992* with Engineering categories.
A Unified Method For The Analysis Of Nonlinear Viscoelasticity And Fatigue Cracking Of Asphalt Mixtures Using The Dynamic Mechanical Analyzer
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Author : Veronica Teixeira Franco Castelo Branco
language : en
Publisher:
Release Date : 2010
A Unified Method For The Analysis Of Nonlinear Viscoelasticity And Fatigue Cracking Of Asphalt Mixtures Using The Dynamic Mechanical Analyzer written by Veronica Teixeira Franco Castelo Branco and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Fatigue cracking is one of the primary modes of distress in asphalt pavements that has an important economic impact. Fatigue resistance characterization of an asphalt mixture is a complex issue due to: (i) composite nature of the material, (ii) gradation of aggregate particles, (iii) variation of asphalt film thickness, (iv) air voids distributions, (v) asphalt binder nonlinear viscoelastic behavior, (vi) effects of binder oxidative aging as a function of time, and (vii) micro crack healing during rest periods. Different methods to assess fatigue cracking in asphalt materials are available in the literature. However, there is no methodology to characterize fatigue cracking behavior of asphalt materials that is independent of the mode of loading (controlled-strain or controlled-stress). The objective of this research is to develop a new methodology to characterize fatigue cracking of the fine aggregate matrix (FAM) portion of asphalt mixtures using dynamic mechanical analyses (DMA). This is accomplished through different, but related, approaches. The first approach relies on identifying the various mechanisms of energy dissipation during fatigue cracking that are manifested in: (i) nonlinear viscoelastic deformation, (ii) fracture, and (iii) permanent deformation. Energy indices were derived to quantify each of these energy dissipation mechanisms and to quantify fatigue cracking irrespective of the mode of loading. The first outcome of the approach is a fatigue damage parameter (crack growth index) that provides comparable results for a given material even when tested under different modes of loading and different load (strain or stress) amplitudes. The developed fatigue characterization method has a lower coefficient of variation when compared to conventional parameters (number of load cycles to failure or cumulative dissipated energy). The crack growth index parameter was also qualitatively and quantitatively compared to three dissipated energy methods available in the literature. The second outcome of this research is a constitutive model that can describe both asphalt mixtures' nonlinear viscoelastic response and fatigue damage in one formulation. Nonlinear viscoelastic as well as damage parameters were obtained for both modes of loading. This second approach has the advantage that the constitutive model can be implemented in a numerical framework to describe the response of asphalt mixtures under various boundary conditions.
Research Activities Annual Report
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Author :
language : en
Publisher:
Release Date : 1991
Research Activities Annual Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Engineering categories.
Validating The Fatigue Endurance Limit For Hot Mix Asphalt
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Author : Brian D. Prowell
language : en
Publisher: Transportation Research Board
Release Date : 2010
Validating The Fatigue Endurance Limit For Hot Mix Asphalt written by Brian D. Prowell and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Technology & Engineering categories.
At head of title: National Cooperative Highway Research Program.
Bituminous Mixtures And Pavements Vii
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Author : A.F. Nikolaides
language : en
Publisher: CRC Press
Release Date : 2019-05-24
Bituminous Mixtures And Pavements Vii written by A.F. Nikolaides and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-24 with Technology & Engineering categories.
Highway engineers are facing the challenge not only to design and construct sustainable and safe pavements properly and economically. This implies a thorough understanding of materials behaviour, their appropriate use in the continuously changing environment, and implementation of constantly improved technologies and methodologies. Bituminous Mixtures and Pavements VII contains more than 100 contributions that were presented at the 7th International Conference ‘Bituminous Mixtures and Pavements’ (7ICONFBMP, Thessaloniki, Greece 12-14 June 2019). The papers cover a wide range of topics: - Bituminous binders - Aggregates, unbound layers and subgrade - Bituminous mixtures (Hot, Warm and Cold) - Pavements (Design, Construction, Maintenance, Sustainability, Energy and environment consideration) - Pavement management - Pavement recycling - Geosynthetics - Pavement assessment, surface characteristics and safety - Posters Bituminous Mixtures and Pavements VII reflects recent advances in highway materials technology and pavement engineering, and will be of interest to academics and professionals interested or involved in these areas.
Binder Characterization And Evaluation
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Author : David A. Anderson
language : en
Publisher: Strategic Highway Research Program (Shrp)
Release Date : 1994
Binder Characterization And Evaluation written by David A. Anderson and has been published by Strategic Highway Research Program (Shrp) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Technology & Engineering categories.
