Influence Of High Rap On Binder Properties In Hot Mix Asphalt Of Northeast
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Influence Of High Rap On Binder Properties In Hot Mix Asphalt Of Northeast
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Author : Donatas Zvirblis
language : en
Publisher:
Release Date : 2014
Influence Of High Rap On Binder Properties In Hot Mix Asphalt Of Northeast written by Donatas Zvirblis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Binders (Materials) categories.
The impact of recycled asphalt pavement (RAP) materials on pavement performance is an important topic of study in the asphalt industry due to environmental and cost benefits. A major issue with RAP is that many agencies are still reluctant to allow producers to use more than 10 to 20 percent RAP because of concerns that mixtures with higher RAP contents will be too stiff, less workable and prone to field failures. However, the recent increases in the cost of asphalt binder and the shrinking supplies of quality aggregate has made the use of higher RAP content in hot mix asphalt (HMA) mixtures a priority for the industry. In this study, eighteen plant produced mixtures were obtained from three locations in the Northeast: New York, New Hampshire and Vermont. These mixtures were produced using different RAP contents of 0%, 20%, 30% and 40%. The eighteen mixtures were carefully extracted using American Association of State Highway and Transportation (AASHTO) T164 method "A" using trichloroethyleneand recovered with AASHTO T170 procedure. The recovered binder was then tested using Direct Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) with AASHTO T315 and T313 procedures respectively. The results obtained from these tests were used to determine the continuous grade of the binders. They were then analyzed and compared to one another. Master curves were created for each recovered binder with RHEA and the data obtained from DSR frequency sweet sequence with a 4mm plate. The data recovered from master curves were used to plot black space and, crossover frequency and R-value graphs to show age hardening of binder. This paper investigates the influence of high RAP on asphalt binder stiffness and ductility.
Impact Of High Rap Content On Structural And Performance Properties Of Asphalt Mixtures
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Author : Imad L. Al-Qadi
language : en
Publisher:
Release Date : 2012
Impact Of High Rap Content On Structural And Performance Properties Of Asphalt Mixtures written by Imad L. Al-Qadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Pavements, Asphalt categories.
Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content
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Author : Randy Clark West
language : en
Publisher: Transportation Research Board
Release Date : 2013
Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content written by Randy Clark West 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 2013 with Pavements, Asphalt categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 752: Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content describes proposed revisions to the American Association of State Highway and Transportation Officials (AASHTO) R 35, Superpave Volumetric Design for Hot Mix Asphalt, and AASHTO M 323, Superpave Volumetric Mix Design, to accommodate the design of asphalt mixtures with high reclaimed asphalt pavement contents.
Investigation Of Low And High Temperature Properties Of Plant Produced Rap Mixtures
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Author : Rebecca McDaniel
language : en
Publisher:
Release Date : 2012
Investigation Of Low And High Temperature Properties Of Plant Produced Rap Mixtures written by Rebecca McDaniel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Pavements, Asphalt categories.
This report provides analysis of the results of testing plant-produced hot mix asphalt (HMA) containing various levels of RAP and different grades of virgin binder. The study was undertaken initially to examine the effects of reclaimed asphalt pavement (RAP) on low-temperature properties of mixtures. In phase I of the study, mixes produced by one contractor in 2006 were tested. The results suggest that the addition of RAP stiffened the mix, but probably not to the extent expected based upon linear blending. There is evidence from other research that also suggests that there are cases when linear blending does not apply. Consequently, in phase II of the project, four more contractors replicated the experiment in their HMA plants. The objectives of the study were also expanded to include an evaluation of the extent of blending of the RAP and virgin binders in plant-produced mixtures.
Investigation Of Low And High Temperature Properties Of Plant Produced Rap Mixtures
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Author : Rebecca McDaniel
language : en
Publisher:
Release Date : 2012
Investigation Of Low And High Temperature Properties Of Plant Produced Rap Mixtures written by Rebecca McDaniel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Pavements, Asphalt categories.
This report provides analysis of the results of testing plant-produced hot mix asphalt (HMA) containing various levels of RAP and different grades of virgin binder. The study was undertaken initially to examine the effects of reclaimed asphalt pavement (RAP) on low-temperature properties of mixtures. In phase I of the study, mixes produced by one contractor in 2006 were tested. The results suggest that the addition of RAP stiffened the mix, but probably not to the extent expected based upon linear blending. There is evidence from other research that also suggests that there are cases when linear blending does not apply. Consequently, in phase II of the project, four more contractors replicated the experiment in their HMA plants. The objectives of the study were also expanded to include an evaluation of the extent of blending of the RAP and virgin binders in plant-produced mixtures.
Investigation Of Binder Rheology And Performance Outcomes Of Recycled Hot Mix Asphalt Using Different Rejuvenation Agents
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Author : Kerry Jean King
language : en
Publisher:
Release Date : 2015
Investigation Of Binder Rheology And Performance Outcomes Of Recycled Hot Mix Asphalt Using Different Rejuvenation Agents written by Kerry Jean King and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Pavements categories.
The research presented in this thesis investigated the effect of various rejuvenation agents on the performance of hot-mix asphalt (HMA) surfacing mixes containing high levels of recycled asphalt pavement (RAP) material (30%). The research aimed to develop testing methodologies for evaluating the mechanical performance properties of HMA mixes and for the characterisation of extracted binder properties. The methodologies were used determine the effects of various rejuvenators on the mechanical performance properties and binder properties fundamental to the long-term performance of pavement surfaces. A testing methodology was developed to investigate the performance properties of five HMA mixes including four mixes that were rejuvenated using different rejuvenation agents and one control. The mechanical testing methodology provided a comprehensive assessment of mix properties that are fundamental to the long-term performance of recycled pavements. A methodology for the characterisation of extracted binders was developed to evaluate properties that had a significant effect on the performance of the binder and therefore the overall mix. The binder properties were compared to results obtained from mechanical performance tests to establish a relationship between binder rejuvenation and performance observations. The results obtained from mechanical testing demonstrated that the cracking resistance of recycled mixes could be significantly improved through the use of rejuvenation agents. Rejuvenation also decreased the stiffness of the mix and had a negative effect on the resistance of a mix to permanent deformation. From the characterisation of the binder, it was found that rejuvenation agents altered the rheological properties of the binder but did not have a notable effect on chemical composition. The rheological performance parameters of the binder correlated to the mix performance observed from mechanical tests. Overall this research has shown that rejuvenation agents can be utilised to enhance the performance of recycled mixes by restoring binder properties.
Asphalt Pavements
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Author : Y. Richard Kim
language : en
Publisher: CRC Press
Release Date : 2014-11-06
Asphalt Pavements written by Y. Richard Kim and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-06 with Technology & Engineering categories.
Asphalt Pavements contains the proceedings of the International Conference on Asphalt Pavements (Raleigh, North Carolina, USA, 1-5 June 2014), and discusses recent advances in theory and practice in asphalt materials and pavements. The contributions cover a wide range of topics:- Environmental protection and socio-economic impacts- Additives and mo
Influence Of Recovery Processes On Properties Of Binders And Aggregates Recovered From Recycled Asphalt Pavement
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Author : Zahid Hossain
language : en
Publisher:
Release Date : 2011
Influence Of Recovery Processes On Properties Of Binders And Aggregates Recovered From Recycled Asphalt Pavement written by Zahid Hossain and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Abson categories.
Usage of recycled asphalt pavement (RAP) in the construction of new pavements has increased in recent years due to the movement to conserve energy and raw materials, and reuse waste materials. To assess the effectiveness of RAP materials in new asphalt mixes, it is important to evaluate the properties of the recovered binders and aggregates. The widely used "Abson" method is employed in this study to recover asphalt binder from RAP. Also, the frequently used "NCAT ignition" method is used to extract aggregates. A laboratory study comprising two field RAP materials, two simulated RAP materials, and corresponding virgin materials was undertaken to assess possible influences of the aforementioned recovery processes. The performance grade (PG) of the recovered binders, and gradation, durability (LAAbrasion and Micro-Deval), specific gravity, sand equivalent, and insoluble residue of the extracted aggregates were evaluated as per the AASHTO and Oklahoma Dept. of Transportation (ODOT) standards. The test results showed that the Abson method notably influenced the critical PG temperatures of the recovered binder. It was also observed that some mechanical properties (durability and sand equivalent) of RAP aggregates were inconsistent with their virgin counterparts. Furthermore, field RAP aggregates showed significant variations in LA Abrasion loss and insoluble residue test results. The findings of this study are expected to be helpful in the evaluation of RAP for reuse in asphalt paving.
Use Of High Volume Reclaimed Asphalt Pavement Rap For Asphalt Pavement Rehabilitation
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Author : Nassim Sabahfar
language : en
Publisher:
Release Date : 2012
Use Of High Volume Reclaimed Asphalt Pavement Rap For Asphalt Pavement Rehabilitation written by Nassim Sabahfar 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.
Because of recent rises in asphalt binder prices, state agencies and contractors are now willing to use higher volumes of reclaimed asphalt pavement (RAP). In this project, the effects of increasing RAP percentage and using fractionated RAP (FRAP) in hot-mix asphalt (HMA) mixtures have been studied. Fractionation involved processing and separating of RAP materials into at least two sizes, typically a coarse fraction and a fine fraction. This study evaluated the effects of increasing the proportions of RAP and FRAP on moisture resistance, rutting, and fatigue cracking of Superpave mixtures. Furthermore, the effect of using different sources of RAP in the mix has been investigated. HMA mixtures with five varying RAP and FRAP contents (20, 30, and 40% RAP, and 30 and 40% FRAP) were studied. The Hamburg wheel-tracking device (HWTD) test (TEX-242-F), the Kansas standard test method no. 56 (KT-56), or modified Lottman test, and the dynamic modulus test (AASHTO TP: 62-03) were used to predict moisture damage, rutting potential, and fatigue cracking resistance of the mixes. HMA specimens were made based on Superpave HMA mix design criteria for 12.5-mm (1/2-inch) nominal maximum aggregate size (NMAS) and compacted using the Superpave gyratory compactor. For the first source of RAP, results of this study showed that although mixture performance declined as the percentage of RAP increased, mixtures with even 40% RAP met minimum performance requirements. The second source of RAP, however, almost failed to meet minimum requirements even at 20% RAP. Results proved the maximum percentage of RAP allowed in the mix is highly influenced by its source. Although some improvements have been observed, especially for the second source of RAP, when RAP is compared to FRAP, FRAP does not seem to considerably affect performance of the HMA mixture.
Evaluating The Effect Of High Rap Content On Asphalt Mixtures And Binders Fatigue Behavior
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Author : Umme Amina Mannan
language : en
Publisher:
Release Date : 2018
Evaluating The Effect Of High Rap Content On Asphalt Mixtures And Binders Fatigue Behavior written by Umme Amina Mannan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Asphalt categories.
One of the main concerns with the application of reclaimed asphalt pavement (RAP) in the asphalt concrete pavement is fatigue cracking due to the stiffness increase with the addition of aged and stiff RAP binder. The purpose of this study is to evaluate fatigue performance of asphalt binder and mixtures with different RAP percentages (0, 15, 25, 35 and 40 %). Among these, 35 and 40 % RAP mixes are considered as high RAP content. This study describes the results of laboratory fatigue response of asphalt mixtures and extracted binders containing RAP to define the effect of RAP on the fatigue performance. To achieve this objective, mixes and binders were tested using the beam fatigue test and the time-sweep test, respectively. Test results were analyzed using two different fatigue approaches, reduction in stiffness and dissipated energy criteria. Results showed that a higher initial stiffness and initial dissipated energy initiate the fatigue failure faster. Since both binders and mixes show an increase in the stiffness and energy consumed per loading cycle with the addition of RAP, resulting mixes containing higher RAP have a very short fatigue life. Also, the fatigue endurance limit decreases drastically with the addition of RAP in the mix. The results comparing two different RAP sources showed that the RAP source has more prominent effect on the mix fatigue performance than the binder fatigue performance. Finally, the traditional fatigue life prediction model is modified to incorporate the effect of RAP in the fatigue equation. The modified regression model predicted reasonable fatigue life of the mixture with a coefficient of determination (R2) close to 1. The measured and predicted fatigue life results were found close to each other for both mix and binder containing RAP.