Effect Of Recycling Agents On The Structural Performance Of Recycled Asphalt Concrete Materials
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Effect Of Recycling Agents On The Structural Performance Of Recycled Asphalt Concrete Materials
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Author : Dallas N. Little
language : en
Publisher:
Release Date : 1981
Effect Of Recycling Agents On The Structural Performance Of Recycled Asphalt Concrete Materials 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 1981 with Pavements, Asphalt categories.
Long Term Effectiveness Of Recycling Agents To Improve Performance Properties Of Asphalt Concrete
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Author : Mahsa Tofighian
language : en
Publisher:
Release Date : 2023
Long Term Effectiveness Of Recycling Agents To Improve Performance Properties Of Asphalt Concrete written by Mahsa Tofighian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Recycled materials such as reclaimed asphalt pavement (RAP) have been incorporated into asphalt mixtures for many years. However, their usage has increased over time as they are seen as a way to reduce the cost of asphalt mixtures, save energy, and protect the environment. Similarly, there has been a growing focus on the utilization of recycled asphalt shingles (RAS) in asphalt mixtures, a pursuit undertaken by various state highway agencies. However, unless appropriate precautions are taken, as the proportion of RAP and RAS in the asphalt mixture is raised, the mixture becomes more brittle, leading to a higher risk of cracking and raveling in the asphalt pavement. Furthermore, the mixture becomes less workable and more challenging to compact in the field, increasing the potential for premature field failure. One strategy to incorporate more RAP and RAS into asphalt mixtures involves the use of specialized recycling agents (RAs), known as rejuvenating agents. Over time, asphalt mixtures undergo aging during construction and over the extended service life of asphalt pavements, resulting in the oxidation of the mix and the loss of a significant portion of the maltenes in the binder composition. Maltenes contribute to the softening effect of the binder, and these recycling agents, when used appropriately, are expected to compensate for this reduction in maltenes. The ultimate result of this rebalancing of components is the softening of the aged binder and an improvement in its resistance to cracking. This study investigates the long-term impact of bio-based and petroleum-based recycling agents (RA's) on recycled asphalt binders with varying levels of reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) content, specifically low (15%) and high (30%) RAP content and 0% and 5% RAS content. The rejuvenated binders underwent short-term and long-term aging through the use of a Rolling Thin Film Oven (RTFO) and Pressure Aging Vessel (PAV), respectively. The performance characteristics of these modified binders at various aging stages were assessed using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR). The study revealed that all RA's used in this research maintained their effectiveness even after long-term aging, though the degree of effectiveness varied. Additionally, the results indicated that the petroleum-based RA required a higher dosage to achieve the same effect as the bio-based RA's. The findings from this research also demonstrated that when rejuvenators are added to mixtures with a high RAP content or a combination of RAP and RAS, the mixture's performance is enhanced in terms of low-temperature cracking and fatigue cracking. Nevertheless, it is crucial to extend this work to field pilot projects to ensure the effective application of these rejuvenating products.
Evaluating The Effects Of Recycling Agents On Asphalt Mixtures With High Ras And Rap Binder Ratios
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Author : Amy Epps Martin
language : en
Publisher:
Release Date : 2020
Evaluating The Effects Of Recycling Agents On Asphalt Mixtures With High Ras And Rap Binder Ratios written by Amy Epps Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Asphalt categories.
"More than 90 percent of highways and roads in the United States are built using hot-mix asphalt (HMA) or warm-mix asphalt (WMA) mixtures, and these mixtures now recycle more than 99 percent of some 76.2 million tons of reclaimed asphalt pavement (RAP) and about 1 million tons of recycled asphalt shingles (RAS) each year. Cost savings in 2017 totaled approximately $2.2 billion with these recycled materials replacing virgin materials. The TRB National Cooperative Highway Research Program's NCHRP Research Report 927: Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios presents an evaluation of how commercially available recycling agents affect the performance of asphalt mixtures incorporating RAP and RAS at high recycled binder ratios."--
Pro 40 International Rilem Conference On The Use Of Recycled Materials In Buildings And Structures Volume 2
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Author : Enric Vázquez
language : en
Publisher: RILEM Publications
Release Date : 2004
Pro 40 International Rilem Conference On The Use Of Recycled Materials In Buildings And Structures Volume 2 written by Enric Vázquez and has been published by RILEM Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Building materials categories.
Asphalt Science And Technology
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Author : Arthur Usmani
language : en
Publisher: CRC Press
Release Date : 1997-08-22
Asphalt Science And Technology written by Arthur Usmani and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-08-22 with Technology & Engineering categories.
"Offers comprehensive, authoritative coverage of the chemistry, technology, and engineering of asphaltic products for paving, road construction, roofing, coatings, adhesives, and batteries. Analyzes microcracking and elucidates the mechanisms of degradation to aid the development of hot melt asphalt and increase longevity."
Cold Recycled Bituminous Concrete Using Bituminous Materials
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Author : Jon A. Epps
language : en
Publisher: Transportation Research Board
Release Date : 1990
Cold Recycled Bituminous Concrete Using Bituminous Materials written by Jon A. Epps 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 1990 with Technology & Engineering categories.
This synthesis will be of interest to pavement designers, construction engineers, and others interested in economical methods for reconstructing or rehabilitating bituminous pavements. Information is provided on the processes and procedures used by a number of states to recycle asphalt pavements in place without application of heat. Since 1975 a growing number of state highway agencies have reconstructed or rehabilitated asphalt pavements by recycling the old pavement in place. This report of the Transportation Research Board describes the processes used for cold in-place recycling, including construction procedures, mix designs, mixture properties, performance, and specifications.
Recycled Materials In Geotechnical And Pavement Applications
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Author : Amin Chegenizadeh
language : en
Publisher: Springer Nature
Release Date : 2022-02-28
Recycled Materials In Geotechnical And Pavement Applications written by Amin Chegenizadeh and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-28 with Science categories.
This book considers the application of recycled materials both in pavement and geotechnical engineering. Currently, Australia has faced the fundamental concern of recycling waste plastic. On 1 January 2018, China enforced a prohibition on the importation of waste plastic. China's ban is followed by other countries like India, Indonesia, and Malaysia. The ban caused many corporations to abandon waste collection agreements, and the stockpiling of waste, as there is nowhere to safely deposit this waste. This issue seems, to a great extent, to have placed Australia's recycling industry in a crisis. As a result, local councils will have to find strategic ways of recycling accumulated waste that will become a more significant issue in the coming years. In Australia, apart from economic growth, the road pavement has weakened rapidly as the current pavement unable to withstand this urgent traffic load demand. The adding of polymers to the mixtures improves the stiffness, rutting resistance, and fatigue cracking [1]. However, the application of virgin polymer is costly. Thus, using waste polymer such as waste plastic polymer is an inexpensive substitute. The potential for recycled plastic to improve the performance properties of asphalt mixtures has been demonstrated in many countries the UK, Canada, The Netherlands, and India [2]. Similarly, another application of recycled materials can be in geotechnical infrastructure. This book considers the application of recycled materials both in pavement and geotechnical engineering. References [1] Airey, G.D., Singleton, T.M., & Collop, A.C.(2002). Properties of polymer modified bitumen after rubber- bitumen interaction. Journal of Materials in Civil Engineering .14(4), 344- 354. [2] K. O'Farrell. Australian Plastics Recycling Survey- National Report. Australian Government, Department of Environment and Energy, Australia. Project reference,2018 A21502.
Recycled Aggregate Concrete Structures
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Author : Jianzhuang Xiao
language : en
Publisher: Springer
Release Date : 2017-11-13
Recycled Aggregate Concrete Structures written by Jianzhuang Xiao and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-13 with Technology & Engineering categories.
This book describes how, given the global challenge of a shortage of natural resources in the 21st century, the recycling of waste concrete is one of the most important means of implementing sustainable construction development strategies. Firstly, the book presents key findings on the micro- and meso-structure of recycled aggregate concrete (RAC), while the second part focuses on the mechanical properties of RAC: the strength, elastic modulus, Poisson’s ratio, stress-strain curve, etc. The third part of the book explores research on the durability of RAC: carbonization, chloride penetration, shrinkage and creep. It then presents key information on the mechanical behavior and seismic performance of RAC elements and structures: beams, columns, slabs, beam-column joints, and frames. Lastly, the book puts forward design guidelines for recycled aggregate concrete structures. Taken as a whole, the research results – based on a series of investigations the author has condu cted on the mechanical properties, durability and structural performance of recycled aggregate concrete (RAC) over the past 10 years – demonstrate that, with proper design and construction, it is safe and feasible to utilize RAC structures in civil engineering applications. The book will greatly benefit researchers, postgraduates, and engineers in civil engineering with an interest in this field.
Recycling Agents For Recycled Bituminous Binders
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Author :
language : en
Publisher:
Release Date : 1980
Recycling Agents For Recycled Bituminous Binders written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Pavements, Asphalt categories.
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.