Durability Of Recycled Asphalt Concrete Surface Mixes
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Durability Of Recycled Asphalt Concrete Surface Mixes
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Author : Osama Ahmed Abdulshafi
language : en
Publisher:
Release Date : 1997
Durability Of Recycled Asphalt Concrete Surface Mixes written by Osama Ahmed Abdulshafi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Asphalt cement categories.
Improving Durability Of Asphalt Mixes Produced With Reclaimed Asphalt Pavement Rap By Enhancing Binder Blending
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Author : Hawraa Kadhim
language : en
Publisher:
Release Date : 2019
Improving Durability Of Asphalt Mixes Produced With Reclaimed Asphalt Pavement Rap By Enhancing Binder Blending written by Hawraa Kadhim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Asphalt concrete categories.
Reclaimed Asphalt Pavement (RAP) has been favoured over virgin materials in the light of the unstable cost of virgin asphalt binders, shortage of quality aggregates, and compelling need to preserve the environment and natural resources. Mixes containing up to 20% RAP are commonly considered to have similar behaviour to virgin mixes. However, during the production process of HMA with RAP, the blending between aged and virgin binders would be partial, which would create heterogeneity in distribution of the aged recycled binder and the soft virgin binder in the HMA-RAP mixes. Hence, it is important to control the blending process between old and new binders to obtain more homogenous mix. Therefore, the main objectives of this research are to examine the kinematics of blending of aged and virgin binders by considering the time-temperature effect during mixing and silo-storage, and assess the thermo-mechanical behaviour of Hot Mix Asphalt (HMA) containing RAP at different blending states. The asphalt mixes used in this research were produced and collected at two plants (Plant 1) and (Plant 2) located in Ontario, Canada. Two Marshall mixes were produced and collected from Plant 1 including a surface course HL-3 containing 15 percent RAP and a base course HL-8 containing 30 percent RAP. These mixes were labelled as 1HL-3 and 1HL-8 respectively. In addition, two Marshall mixes were produced and collected from Plant 2 including a surface course HL-3 containing 20 percent RAP and a base course HL-8 containing 40 percent RAP. These mixes were labelled as 2HL-3 and 2HL-8 respectively. To investigate the impact of storage time on the blending progress and achieving a cohesive final binder, the mix samples were collected as a function of storage time in the silo. The first sampling was done immediately after production (t = 0-hour), and then at several time intervals of silo-storage; i.e., at 1, 4, 8, and 12 hours. In case of Plant 2, the samples were additionally collected after 24-hour of storage time. All samples were then kept in a storage room at 7ʻC until the day of compaction to minimize any further blending between aged and virgin binder. To understand the blending phenomena and its effect on the performance of the pavement, a multi-scale investigation is carried out. The blending was examined in terms of micro-mechanical and rheological properties. The microstructure of the blending zones were examined under The Environmental Scanning Electron Microscope (ESEM). In addition the effect of the silo-storage time on the rheology of the binders was investigated. The results indicate that increasing the interaction time and temperature between the aged and virgin binder significantly results in a better blending. The performance of RAP-HMA with respect to the silo-storage time was examined using Dynamic Modules Test, Thermal Stress Restrained Specimen Test (TSRST), Rutting Test, and Flexural Beam Fatigue Test. The experimental data indicates that samples collected after 12-hour of silo storage exhibited a reduction in the stiffness due to better blending of aged and virgin binder. In addition, the 12-hour samples showed enhancement in their fracture temperature, rutting depth, and fatigue life, accompanied with a better blending between their aged and virgin binder. On the other hand, the samples that collected after 24-hour silo-storage had a higher stiffness in comparison with the 8 and 12-hour samples. Moreover, the AASHTOWare Pavement Mechanistic-Empirical Design was utilized to examine the effect of the 12-hour silo-storage time on the long term performance of the pavements. Four pavement structures have been designed for this purpose. These pavements have the same structure of their granular A, granular B, and the subgrade. Yet, the first layer (surface course and base course) is a silo-storage time-dependent. The long-term field performance prediction indicates a slight improvement with the 12-hour pavements (Plant1 12hrs and Plant2 12hrs). However, it should be noted that AASHTOWare Pavement Mechanistic-Empirical Design does not appear to properly capture the effect of blending in the pavement performance. The collected experimental evidences unveils correlations between time-temperature effects and mixture performance. Based on these findings, the research provides practical recommendations to the professionals of the Canadian asphalt industry for a better use of RAP. Ultimately, this research recommends a 12-hour silo-storage time for the RAP-HMA for better performance and durability of the mixes.
Evaluation Of Properties Of Recycled Asphalt Concrete Hot Mix
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Author : Elton R. Brown
language : en
Publisher:
Release Date : 1984
Evaluation Of Properties Of Recycled Asphalt Concrete Hot Mix written by Elton R. Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Concrete categories.
Evaluation Of The Performance Of Cold Mix Recycled Asphalt Concrete Pavement In Washington
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Author : Khossrow Babaei
language : en
Publisher:
Release Date : 1989
Evaluation Of The Performance Of Cold Mix Recycled Asphalt Concrete Pavement In Washington written by Khossrow Babaei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Pavements categories.
Experimental Study Of Hot Recycled Asphalt Mixtures With High Percentages Of Reclaimed Asphalt Pavement And Different Recycling Agents
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Author : Jinhai Yan
language : en
Publisher:
Release Date : 2014
Experimental Study Of Hot Recycled Asphalt Mixtures With High Percentages Of Reclaimed Asphalt Pavement And Different Recycling Agents written by Jinhai Yan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Analysis of variance categories.
Hot recycled mixture has been widely used as binder course on highways in the Jiangsu Province, China. The objectives of this study were to evaluate recycled mixture's performance with different Reclaimed Asphalt Pavement (RAP) contents and recycling agents (RA). At first, optimum RA contents were determined according to asphalt blending charts based on penetration index. Secondly, the performance of recycled mixtures and control virgin asphalt mixture was evaluated based on retained stability, Tensile Strength Ratio (TSR), dynamic stability (DS), failure strain, and fatigue life. Thirdly, statistical significance on the basis of analysis of variance was evaluated as a function of RAP contents and RA type. The results indicated that adding RA could improve moisture stability, low temperature cracking resistance, while decreasing high temperature stability and strength performance of recycled mixture. Recycled asphalt mixture Sup-20 with RA has similar performance compared to virgin asphalt mixture Sup-20. The former has better moisture stability and high temperature stability than that of the latter, with a slight reduction in low temperature cracking and fatigue resistance. With a fixed RA-2, TSR, and failure strain of recycled mixes decreases, and DS first slightly decreases and then increases, while fatigue life first increases and then decreases with increasing RAP contents. The results indicated that the interface status and blending level between recycled asphalt and aggregate is variable due to the mixing process and material compositions, which results in the varied performance results of recycled mixes due to the different test temperatures, loading modes, and testing periods, etc. Furthermore, the results of analysis of variance are consistent with the experimental test results.
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.
Research And Application Of Hot In Place Recycling Technology For Asphalt Pavement
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Author : Banting W.P. Sze
language : en
Publisher: Woodhead Publishing
Release Date : 2020-11-12
Research And Application Of Hot In Place Recycling Technology For Asphalt Pavement written by Banting W.P. Sze and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-12 with Technology & Engineering categories.
Research and Application of Hot In-Place Recycling Technology for Asphalt Pavement is the first comprehensive book on the topic that presents over two decades of theoretical and practical experience gained in China. The book gives comprehensive coverage of HIPR, including pavement evaluation, distress analysis, mix design, processes and equipment selection, implementation and acceptance criteria. In eight chapters, this book covers HIPR from theoretical and practical viewpoints, and provides detailed case-studies based on real-world experience. This book includes everything engineers need to apply HIPR to improve sustainability and reduce disruption during the maintenance and repair of asphalt. Presents, for the first time in English, decades of experience and research on Hot in-Place Recycling Technology (HIPR) for asphalt pavements Considers all aspects of HIPR, giving engineers all they need to use the technique for road maintenance and repair Details how HIPR drastically improves the sustainability of asphalt and reduces disruption to traffic during repair and maintenance work Includes detailed case studies from thirty years of HIPR in China, giving context and practical know-how
Recycling Of Asphalt Concrete Airfield Pavement
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Author : R. B. Brownie
language : en
Publisher:
Release Date : 1979
Recycling Of Asphalt Concrete Airfield Pavement written by R. B. Brownie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Pavements, Asphalt concrete categories.
Evaluation Of A Unified Design For Asphalt Recycling By Means Of Dynamic And Fatigue Testing
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Author : William George Whitcomb
language : en
Publisher:
Release Date : 1981
Evaluation Of A Unified Design For Asphalt Recycling By Means Of Dynamic And Fatigue Testing written by William George Whitcomb and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Asphalt concrete categories.
Design methods for pavement mixtures containing recycled asphalt concrete have been explored in many studies. Most methods of design are modelled after procedures originally developed for conventional construction with virgin raw materials. The unique properties of aged asphalt as raw material are rarely considered when applying conventional procedures. The approach developed by Witco Chemical assumes that each recycling project requires design and additives to compensate for aging effects. The purpose of this investigation was to ascertain if (1) the simplified method of design developed by Witco Chemical can be employed uniformly in all recycling operations using aged asphalt concrete as the main ingredient of the new mix, and (2) dynamic and fatigue testing are helpful in the evaluation of the recycled mix. The result of the study was an affirmative answer to both questions. A prerequisite for successful recycling, it was found, is the use of a recycling agent which provides for high mixing efficiency to restore the durability and consistency. The experiments carried out were in conjunction with a hot-mix recycling project on Interstate 90 near Ellensburg, Washington. Laboratory tests were performed on samples of the aged asphalt concrete before recycling and on mixtures containing added new aggregate to duplicate the mixtures used at the Ellensburg project. The recycling agents were added to the mixture by direct incorporation into the recovered asphalt (termed reconstituted asphalt) and by addition of the recycling agent and new aggregate to the crushed aged pavement. A mixture was also prepared with a virgin asphalt having the same viscosity at 60 C (140 F) as the reconstituted asphalt. A simple formula was used to determine the optimum asphalt content. This value compared favorably with the average of the Marshall and Hveem mix design values. Resilient moduli, permanent vertical deformations and fatigue life were determined by dynamic testing of the two recycled mixes and the two control mixes. Static tensile strength tests were also performed. The results indicated the resilient modulus for each mix to be within an acceptable range for bituminous pavements. The recycled mixtures showed lower plastic deformations than the completely fluxed reconstituted control mix. The recycled mixes and the reconstituted control mix showed higher fatigue resistance than the virgin control mix. The virgin control and reconstituted mixes showed a higher tensile strength than the recycled mixes. All values were still within an acceptable range for bituminous pavements.
Flexible Pavement Mixture Design Using Reclaimed Asphalt Concrete
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Author : Bernard F. Kallas
language : en
Publisher:
Release Date : 1984
Flexible Pavement Mixture Design Using Reclaimed Asphalt Concrete written by Bernard F. Kallas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Pavements, Asphalt categories.