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Author: Munir D. Nazzal Publisher: ISBN: Category : Binders (Materials) Languages : en Pages :
Book Description
This report summarizes the research work that was completed to assess the optimum percentages of recycled asphalt pavement (RAP) that can be used in surface course mixtures of local roadways while ensuring durability is maintained. This project was divided into two phases. Phase 1 included conducting a comprehensive laboratory testing on mixtures with different RAP contents and recycling agents. Based on the results of Phase 1, Phase 2 of this project involved constructing eight test sections as a part of a resurfacing project on Hall Road in the City of Columbus. Surface course asphalt mixtures with a similar aggregate blend but different percentages of RAP were used in these test sections. The first section (control section) had a mix with 20% RAP and PG 64-22 binder. While three test sections had mixes with 30%, 40%, 50% RAP, PG 64-22 binder, and Sylvaroad recycling agent, three other sections had mixes with the same RAP percentages and binder but used Hydrolene as the recycling agent. Finally, the last section was constructed using a mixture containing 30% RAP and PG 64-28 binder with no recycling agent. Cores were obtained at different locations within each test section. In addition, specimens were compacted in a laboratory from loose mixtures that were obtained during the construction of each test section. Tests were done on field cores and laboratory-compacted specimens. The test results showed that Hydrolene was more effective than Sylvaroad in improving the fatigue cracking resistance of RAP mixes with more than 0.3 binder. In addition, the tests results showed that the 30% RAP, 40% RAP, and 50% RAP mixes had similar low-temperature cracking resistance to that of the control. The laboratory test results also showed that all mixes had acceptable rutting resistance. The results of the cost analyses conducted in Phase 2 indicated that using a higher RAP content of 40% and recycling agents can reduce the initial cost of an asphalt mixture by at least 15%.
Author: Munir D. Nazzal Publisher: ISBN: Category : Binders (Materials) Languages : en Pages :
Book Description
This report summarizes the research work that was completed to assess the optimum percentages of recycled asphalt pavement (RAP) that can be used in surface course mixtures of local roadways while ensuring durability is maintained. This project was divided into two phases. Phase 1 included conducting a comprehensive laboratory testing on mixtures with different RAP contents and recycling agents. Based on the results of Phase 1, Phase 2 of this project involved constructing eight test sections as a part of a resurfacing project on Hall Road in the City of Columbus. Surface course asphalt mixtures with a similar aggregate blend but different percentages of RAP were used in these test sections. The first section (control section) had a mix with 20% RAP and PG 64-22 binder. While three test sections had mixes with 30%, 40%, 50% RAP, PG 64-22 binder, and Sylvaroad recycling agent, three other sections had mixes with the same RAP percentages and binder but used Hydrolene as the recycling agent. Finally, the last section was constructed using a mixture containing 30% RAP and PG 64-28 binder with no recycling agent. Cores were obtained at different locations within each test section. In addition, specimens were compacted in a laboratory from loose mixtures that were obtained during the construction of each test section. Tests were done on field cores and laboratory-compacted specimens. The test results showed that Hydrolene was more effective than Sylvaroad in improving the fatigue cracking resistance of RAP mixes with more than 0.3 binder. In addition, the tests results showed that the 30% RAP, 40% RAP, and 50% RAP mixes had similar low-temperature cracking resistance to that of the control. The laboratory test results also showed that all mixes had acceptable rutting resistance. The results of the cost analyses conducted in Phase 2 indicated that using a higher RAP content of 40% and recycling agents can reduce the initial cost of an asphalt mixture by at least 15%.
Author: Amy Epps Martin Publisher: ISBN: 9780309481045 Category : Asphalt Languages : en Pages : 284
Book Description
"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."--
Author: Jhony Habbouche Publisher: ISBN: Category : Pavements, Asphalt concrete--Recycling Languages : en Pages : 0
Book Description
In recent years, several state highway agencies have introduced special provisions and specifications to allow the use of higher contents of reclaimed asphalt pavement (RAP) in asphalt surface mixtures. The challenges associated with high RAP mixtures can be addressed through the use of additives such as recycling agents (RAs) and/or softer binders. Currently, there are no specific guidelines or specifications available to evaluate the acceptability of RAs in Virginia. The purpose of this study was to evaluate the short- and long-term effectiveness of RAs in improving the performance of asphalt mixtures, particularly those with high RAP contents. Another objective of the study was to establish a performance-based framework to determine the acceptability of a specific RA product for inclusion in the Virginia Department of Transportation’s Approved Product List. Both objectives were achieved by benchmarking recycled binder blends (Phase I) and mixtures (Phase II). These were then compared in terms of laboratory performance to commonly used virgin asphalt binders and mixtures in Virginia. Moreover, a comprehensive review of the literature and information from state departments of transportation and RA suppliers on the current state of the practice regarding the use of recycled materials and RAs in asphalt mixtures was summarized. Component materials, including three virgin asphalt binders, RAP and aggregate materials from three different sources, and six RAs, were collected and tested. Phase I involved testing virgin and RAP binders; combinations of virgin binder and RAP binder; and combination of virgin binder, RAP binder, and RAs. A total of 26 binder blends were evaluated at various aging conditions through numerous rheology- and chemistry-based tests. In Phase II, 10 asphalt mixtures were designed and evaluated for durability, resistance to rutting, and resistance to cracking at various aging conditions. Cross-scale evaluation of asphalt binder and mixture testing data was established. Finally, preliminary verification was performed using data collected from various field trials constructed in Virginia. Based on the binders and mixtures tested in this study, the effectiveness of RAs in improving the properties of asphalt binder blends is specific to the product being used and to the targeted temperatures or conditions. Moreover, RAs can enhance the performance and increase the use of recycled materials in asphalt mixtures provided that the correct and suitable dosage of RA product is determined through a performance-based testing framework. The study recommends the following: (1) adopting the streamlined frameworks presented in this study to determine the acceptability of a given RA; (2) further validating the presented framework using different component materials; (3) employing balanced mix design tests to assess the performance characteristics of surface mixtures (with A and D designations) with RAs and drafting a roadmap; (4) collecting and further evaluating the field performance of all trials involving high RAP, RAs, and/or softer binders; (5) investigating the availability and activity of binders, especially with RAs, in RAP materials; (6) evaluating and establishing a protocol to assess the consistency of RAP materials; and (7) quantifying the environmental and economic impacts of using surface mixtures with high RAP contents and/or RAs.
Author: Akmal Durrani Publisher: ISBN: Category : Low-volume roads Languages : en Pages : 265
Book Description
Using reclaimed asphalt pavement (RAP) in pavement applications is one of the topics of current interest for civil engineers as RAP is a promising recycled material in terms of cost savings and environmental sustainability. There are at least 4 million tons of RAP remained annually to be used in pavement construction applications other than Hot Mix Asphalt (HMA). Given the availability of RAP, one of its best uses is in pavement preservation (PP) treatments because RAP is generated during the same work, maintenance, or rehabilitation process. The information gleaned from the literature review concludes RAP is a cost-effective alternative to virgin aggregate (VA) in the PP applications if agencies have access to RAP as a surplus product. Having a neutral charge, it works well with binders. According to some agencies, RAP even outperforms VA in many cases.
Author: National Research Council (U.S.). Transportation Research Board Publisher: Transportation Research Board National Research ISBN: Category : Nature Languages : en Pages : 64
Book Description
"This synthesis will be of special interest and usefulness to design engineers, materials technologists, and others seeking information on the potential use of recycled materials in design, construction, rehabilitation, and maintenance of pavements, bases, and other components of the highway system. Detailed information is presented on procedures for pavement recycling."--Avant-propos.
Author: Marco Pasetto Publisher: Springer Nature ISBN: 3030297799 Category : Science Languages : en Pages : 503
Book Description
This volume highlights the latest advances, innovations, and applications in the field of asphalt pavement technology, as presented by leading international researchers and engineers at the 5th International Symposium on Asphalt Pavements & Environment (ISAP 2019 APE Symposium), held in Padua, Italy on September 11-13, 2019. It covers a diverse range of topics concerning materials and technologies for asphalt pavements, designed for sustainability and environmental compatibility: sustainable pavement materials, marginal materials for asphalt pavements, pavement structures, testing methods and performance, maintenance and management methods, urban heat island mitigation, energy harvesting, and Life Cycle Assessment. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.
Author: Fernando Pacheco-Torgal Publisher: Woodhead Publishing ISBN: 0128189827 Category : Technology & Engineering Languages : en Pages : 422
Book Description
Eco-efficient Pavement Construction Materials acquaints engineers with research findings on new eco-efficient pavement materials and how they can be incorporated into future pavements. Divided into three distinctive parts, the book emphasizes current research topics such as pavements with recycled waste, pavements for climate change mitigation, self-healing pavements, and pavements with energy harvesting potential. Part One considers techniques for recycling, Part Two reviews the contribution of pavements for climate change mitigation, including cool pavements, the development of new coatings for high albedo targets, and the design of pervious pavements. Finally, Part Three focuses on self-healing pavements, addressing novel materials and design and performance. Finally, the book discusses the case of pavements with energy harvesting potential, addressing different technologies on this field. Offers a clear and concise lifecycle assessment of asphalt pavement recycling for greenhouse gas emission with temporal aspects Applies key research trends to green the pavement industry Includes techniques for recycling waste materials, the design of cool pavements, self-healing mechanisms, and key steps in energy harvesting
Author: Carl L. Monismith Publisher: McGraw-Hill Companies ISBN: 9780070429833 Category : Technology & Engineering Languages : en Pages : 480
Book Description
Focusing on asphalt paving technology, this work emphasizes quality control and quality assurance programmes in producing high-quality pavements. It combines theory and practice of asphalt paving including developments and information from the recently completed Strategic Highway Research Program which was designed to improve asphalt specifications, mix design and analysis systems.
Author: Munir D. Nazzal
Author: Munir D. Nazzal
Author: Amro Abushama
Author: Amy Epps Martin
Author: Jhony Habbouche
Author: Akmal Durrani
Author: Asphalt Institute
Author: National Research Council (U.S.). Transportation Research Board
Author: Marco Pasetto
Author: Fernando Pacheco-Torgal
Author: Carl L. Monismith