[PDF] Influence Of Recovery Processes On Properties Of Binders And Aggregates Recovered From Recycled Asphalt Pavement - eBooks Review

Influence Of Recovery Processes On Properties Of Binders And Aggregates Recovered From Recycled Asphalt Pavement


Influence Of Recovery Processes On Properties Of Binders And Aggregates Recovered From Recycled Asphalt Pavement
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Influence Of Recovery Processes On Properties Of Binders And Aggregates Recovered From Recycled Asphalt Pavement


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.



Fracture And Viscoelastic Properties Of Asphalt Binders During Fatigue And Rest Periods


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.



Influence Of High Rap On Binder Properties In Hot Mix Asphalt Of Northeast


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.



Selection Of Asphalt Recycling Methods And Recycled Asphalt Mixture Properties


Selection Of Asphalt Recycling Methods And Recycled Asphalt Mixture Properties
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Author : Nicholas James Cerullo
language : en
Publisher:
Release Date : 2009

Selection Of Asphalt Recycling Methods And Recycled Asphalt Mixture Properties written by Nicholas James Cerullo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Asphalt categories.




Performance Assessment Of Asphalt Mixes Containing Reclaimed Asphalt Pavement And Tire Rubber


Performance Assessment Of Asphalt Mixes Containing Reclaimed Asphalt Pavement And Tire Rubber
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Author : Shawn Shiangfeng Hung
language : en
Publisher:
Release Date : 2018

Performance Assessment Of Asphalt Mixes Containing Reclaimed Asphalt Pavement And Tire Rubber written by Shawn Shiangfeng Hung and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.


The pavement community, including both agencies and industries, is moving toward more sustainable pavement designs and pavement network management. Increasing amounts of recycled materials, both reclaimed asphalt pavement (RAP) and recycled tire rubber, are expected to be used in new pavement construction projects in the future to reduce the use of virgin binder and aggregates. The main concern of using recycled materials in new asphalt pavement is the potential negative effect on the performance. Thus, the primary objective of this dissertation is to improve the current laboratory testing technologies and performance assessment approaches for characterizing the performance-related properties of asphalt mixes containing recycled materials and to improve understanding of how these properties affect the performance of asphalt pavements so that they can be designed and constructed better. A major challenge regarding the use of high RAP content mixes is the differences in the rheological properties of the virgin binder (mixes without RAP) and the blended binder (mixes with RAP). Traditionally, binder blending charts are used to determine the appropriate RAP content in asphalt mixes and the selection of virgin binder grade as part of the Superpave volumetric mix design procedures when RAP is incorporated in the mix. However, producing mixes based on blending charts that require testing of extracted and recovered RAP binders is expensive and hazardous. An alternative test approach for binder blending charts using fine aggregate matrix (FAM) mix testing is presented in this dissertation. The results demonstrated that the proposed approach could estimate the blended binder intermediate and low performance grading temperatures within ±3°C of the measured blended binder performance grading temperatures. Even though the proposed approach is not as accurate as the blending chart method (within ±2°C), it provides both cost and environmental benefits. Currently, the Superpave Performance Grading (PG) system cannot not be used to evaluate the performance-related properties of asphalt rubber binders produced using larger crumb rubber particles (maximum particle size passing 2.36 mm sieve) due to the limitations of parallel plate geometry. With the consideration of more open-graded or gap-graded rubberized hot mix asphalt (RHMA-O and RHMA-G) projects in the future, it is important to be able to perform Superpave PG testing on asphalt rubber binder and to establish performance-based contract acceptance criteria for the production of asphalt rubber binders. The test results indicated that the concentric cylinder geometry is an appropriate alternative geometry to parallel plates for quantifying the properties of asphalt rubber binders and specifically for assessing the high-temperature performance properties of binders containing crumb rubber particles larger than 250 [mu]m. Concerns have been raised with regard to incorporating reclaimed rubberized asphalt pavement (RRAP) into dense-graded new hot mix asphalt (HMA-DG) and RAP into new RHMA-G since the interactions between the virgin binder, age-hardened binder, and recycled tire rubber could considerably affect the rutting, fatigue cracking, and thermal cracking performances of new HMA-DG and RHMA-G. The fundamental differences between RAP and RRAP were identified and the performance of new mixes that contain these recycled materials were evaluated in this study. The experimental results showed that adding RRAP to HMA-DG mixes is ideal to resist rutting and low-temperature cracking based on the changes in mix stiffness. The HMA-DG mixes containing RRAP are better at resisting high tensile strain loadings than mixes containing RAP. In addition, adding RAP to RHMA-G mixes improves the rutting performance but diminishes the cracking performance, and potentially negating the benefits of selecting RHMA-G as an overlay to retard the rate of reflection cracking. Lastly, the effects of rest periods on asphalt fatigue performance considering asphalt thixotropy, non-linearity, self-heating, self-cooling, and steric hardening were also investigated in this research. The experimental test results showed that asphalt thixotropic softening and other biasing effects control the first 10 to 15 percent decrease in stiffness for unmodified binders and 15 to 35 percent decrease in stiffness for modified binders under cyclic loading, and this decrease in stiffness can be recovered with the introduction of rest periods. This means that most of the repeated loadings applied to test specimens within the thixotropic softening range do not caused any fatigue damage but only softening of the materials. Thus, by providing sufficient rest periods within the thixotropic softening range can effectively improve asphalt fatigue performance. Both the thixotropic softening range and the required time for thixotropic recovery (i.e., rest periods) need to be considered in asphalt fatigue test and mechanistic-empirical (ME) design for better evaluation of the true fatigue performance.



Asphalt Pavements


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 Warm Mix Asphalt On Aging Of Asphalt Binders


Influence Of Warm Mix Asphalt On Aging Of Asphalt Binders
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Author : Ala R. Abbas
language : en
Publisher:
Release Date : 2014

Influence Of Warm Mix Asphalt On Aging Of Asphalt Binders written by Ala R. Abbas 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 categories.




Effect Of Chemical Solvents On Rheological Properties Of Recovered Asphalt Binders


Effect Of Chemical Solvents On Rheological Properties Of Recovered Asphalt Binders
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Author : Yazeed Abu Hassan
language : en
Publisher:
Release Date : 2016

Effect Of Chemical Solvents On Rheological Properties Of Recovered Asphalt Binders written by Yazeed Abu Hassan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Asphalt categories.


Extraction and recovery of asphalt binders is an important procedure, although the rheological properties of the recovered binder may vary from the actual values due to many factors. This study has been conducted to evaluate the effect of different chemical solvents on the rheological properties of the recovered asphalt binder at high, intermediate, and low temperatures excluding the other factors that may affect the results. Five different binders were taken into consideration when this study was conducted, PG 58-28, PG 64-22, PG 64-28, PG 70-22, and PG 76-28, along with three different types of chemical solvents largely used as an industrial solvent, which are Trycoloroethelene (TCE), N-Propyl Bromide (nPB) brand called Entron-AE and Toluene.To catch the effect left by these solvents on the recovered binders, each binder has been dissolved in a specific amount of each of the three chemical solvents individually, the proportions of the solvent to the asphalt binder used was almost equal to the amount of the solvent needed to extract the same amount of binder out of a mixtures using a centrifuge. After leaving it for a while and making sure that the binder is totally dissolved, the binder is then recovered using a normal distillation process called the Abson method. In order to determine whether the age of the binder affects the results obtained from the recovered binders or not, testing has been done on unaged binders, short term aged binders, and long term aged binders, and in order to do that, short term aging has been simulated using the Rolling Thin Film Oven Test (RTFO), and the long term aging has been simulated using the Pressurized Aging Vessel (PAV).Finally, both original and recovered binders were tested at different aging conditions using the Dynamic Shear Rheometer (DSR), and the Bending Beam Rheometer (BBR). Data were used to obtain a full continuous grading of both the original (base) binder and the recovered binder for the five different binders used in this study using the three chemical solvents. Direct Comparisons were also made to compare the results of the original binder to the recovered binders using Trichloroethylene (TCE), Normal Propyl Bromide (nPB), and Toluene. Results showed that TCE will exhibit high softening effect unlike the Toluene which showed reasonable and representative data compared to the base binder, while nPB kept on giving un consistent data without a specific pattern.



Comparative Study On Recovered Binder Properties Using Three Asphalt Emulsion Recovery Methods


Comparative Study On Recovered Binder Properties Using Three Asphalt Emulsion Recovery Methods
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Author : Nikornpon Prapaitrakul
language : en
Publisher:
Release Date : 2010

Comparative Study On Recovered Binder Properties Using Three Asphalt Emulsion Recovery Methods written by Nikornpon Prapaitrakul and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Asphalt emulsion categories.


Determining the properties of residual binders is important to the effective use of asphalt emulsion chip seals. Yet, the effect of laboratory methods on recovered binder properties used to simulate residual binders in the field is not well understood. In this research, the residues of five asphalt emulsions were compared after recovery by three methods, a Hot Oven procedure (similar to ASTM D244-04), a Stirred-Can procedure (as reported in TXDOT 0-1710), and a Warm Oven method (ASTM D7497-09). The recovered binders were tested with size exclusion chromatography (SEC) to assess the presence of residual moisture. Properties of the original base binders and the corresponding recovered binders were compared using dynamic shear rheometry and Fourier transform infrared spectrometry. The SEC results showed no residual water in any of the recovered samples, except the samples from Warm Oven recovery, which showed a small detectable amount of residual moisture. The results from statistical analysis of binder properties using ANOVA plus Tukey's Honestly Significant Difference test suggest that recovered binders from the Warm Oven method are statistically different from their base binders. Nevertheless, considering each of the residues recovered from the three methods in paired comparisons with the other residues, none is statistically different from the others.



Effect Of Asphalt Rejuvenating Agent On Aged Reclaimed Asphalt Pavement And Binder Properties


Effect Of Asphalt Rejuvenating Agent On Aged Reclaimed Asphalt Pavement And Binder Properties
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Author : Nassim Sabahfar
language : en
Publisher:
Release Date : 2016

Effect Of Asphalt Rejuvenating Agent On Aged Reclaimed Asphalt Pavement And Binder Properties 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 2016 with categories.


Hot in-place recycling (HIR) preserves distressed asphalt pavements while minimizing use of virgin binder and aggregates. The final quality of an HIR mixture depends on the characteristics of the original binder, aging of the pavement surface during service, and whether or not new binder or rejuvenator was added to the mixture. An HIR mixture should maintain desired properties for additional service periods, making asphalt binder modification inevitable. Asphalt binder modifications in HIR are commonly performed by adding an asphalt rejuvenating agent (ARA). However, ARA may adversely affect the qualities of new HIR and potentially fail to improve the quality of the final surface. The objective of this research was to investigate the effects of rejuvenation on HIR performance characteristics by assessing critical performance indicators such as stiffness, permanent deformation, moisture susceptibility, and cracking resistance. A two-step experimental program was designed that included mechanical property measurements of the HIR mixture and rheological properties of the extracted binder. The level of mixing occurring between new and aged binder with ARA was also investigated. HIR samples were obtained from three Kansas Department of Transportation projects, and Hamburg wheel-tracking device, dynamic modulus, flow number, Texas overlay, thermal stress restrained specimen, and moisture susceptibility tests were conducted on mixtures with and without ARA. Rheological studies on the extracted binder included dynamic shear rheometer and bending beam rheometer tests. The miscibility of new and aged binder was investigated using scanning electron microscope (SEM) images, energy dispersive X-ray spectroscopy (EDXS), and the exudation droplet test (EDT). Study results showed significant variability in the mechanical performance of HIR mixtures, which was attributed to the variability of binders as observed in EDT, SEM, and EDXS studies. Life-cycle cost analysis (LCCA) showed that HIR is an economic maintenance alternative for asphalt projects in Kansas. LCCA results showed that pavement design strategies with HIR activities will result in alternatives with lower net present values when compared to alternatives without HIR maintenance activities.