Evaluation Of The Performance Of Cold Mix Recycled Asphalt Concrete Pavement In Washington
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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.
Evaluation Of Innovative Cold Mix Recycled Asphalt Concrete As Backfill Material In Pipeline Maintenance
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Author : Shih-Huang Chen
language : en
Publisher:
Release Date : 2019
Evaluation Of Innovative Cold Mix Recycled Asphalt Concrete As Backfill Material In Pipeline Maintenance written by Shih-Huang Chen 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.
Cold mix recycled asphalt (CMRA) concrete was evaluated to be an innovative repair material to improve the pavement quality and environmental impact on pipeline maintenance in this study. The study presented and specifically examined the use of CMRA with 2.5 % foam asphalt content as a replacement for the currently used controlled low-strength material (CLSM) as pipeline backfill material. CMRA's material properties, performance, carbon dioxide emissions, cost, and construction time were analyzed in this study to confirm the advantages and limitations of CMRA. The results concluded that CMRA performed better than CLSM for all the items analyzed. Specifically, according to the performance analysis, CMRA exhibited a better Marshall stability index, California bearing ratio, indirect tensile strength, tensile strength ratio, anti-rutting ability, and penetration than the standards specified. Furthermore, the average carbon emissions of CMRA were 36 % less than CLSM, could save at least 2h of construction time per cubic meter of construction, and immediately opened traffic. However, CRMA's construction cost in this study was similar to CLSM and was only lower (up to 2.3 %) by considering a similar price of cement, asphalt, and additives. Based on the aforementioned results, this study concluded that the findings may be of particular interest for Taiwanese pipeline maintenance projects as a backfill material and is worthy of further research.
Evaluation Of Recycled Asphaltic Concrete
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Author : Charles S. Hughes
language : en
Publisher:
Release Date : 1977
Evaluation Of Recycled Asphaltic Concrete written by Charles S. Hughes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Pavements, Asphalt categories.
This report describes a project in which approximately 6,200 tons (5,630 Mg) of asphaltic concrete were recycled through a conventional asphalt batch plant. During the construction of the project, a buildup of asphalt-coated fines occurred in the dryer and the dust collector. The buildup is thought to have been associated with the fineness and/or the high asphalt content of the recycled mix. To solve the problem, a change was made in the recycling process. The project was completed using a heat transfer method with mix proportions as high as 50% recycled material added to 50% virgin aggregate.
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.
Evaluation Of Long Term Field Performance Of Cold In Place Recycled Roads
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Author :
language : en
Publisher:
Release Date : 2007
Evaluation Of Long Term Field Performance Of Cold In Place Recycled Roads written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Pavements categories.
Cold in-place recycling (CIR) has become an attractive method for rehabilitating asphalt roads that have good subgrade support and are suffering distress related to non-structural aging and cracking of the pavement layer. Although CIR is widely used, its use could be expanded if its performance were more predictable. Transportation officials have observed roads that were recycled under similar circumstances perform very differently for no clear reason. Moreover, a rational mix design has not yet been developed, design assumptions regarding the structural support of the CIR layer remain empirical and conservative, and there is no clear understanding of the cause-effect relationships between the choices made during the design/construction process and the resulting performance. The objective of this project is to investigate these relationships, especially concerning the age of the recycled pavement, cumulative traffic volume, support conditions, aged engineering properties of the CIR materials, and road performance. Twenty-four CIR asphalt roads constructed in Iowa from 1986 to 2004 were studied: 18 were selected from a sample of roads studied in a previous research project (HR-392), and 6 were selected from newer CIR projects constructed after 1999. This report summarizes the results of a comprehensive program of field distress surveys, field testing, and laboratory testing for these CIR asphalt roads. The results of this research can help identify changes that should be made with regard to design, material selection, and construction in order to lengthen the time between rehabilitation cycles and improve the performance and cost-effectiveness of future recycled roads.
Evaluation Of Long Term Field Performance Of Cold In Place Recycled Roads
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Author : Don Chen
language : en
Publisher:
Release Date : 2007
Evaluation Of Long Term Field Performance Of Cold In Place Recycled Roads written by Don Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Pavements, Asphalt categories.
Cold in-place recycling (CIR) has become an attractive method for rehabilitating asphalt roads that have good subgrade support and are suffering distress related to non-structural aging and cracking of the pavement layer. Although CIR is widely used, its use could be expanded if its performance were more predictable. Transportation officials have observed roads that were recycled under similar circumstances perform very differently for no clear reason. Moreover, a rational mix design has not yet been developed, design assumptions regarding the structural support of the CIR layer remain empirical and conservative, and there is no clear understanding of the cause-effect relationships between the choices made during the design/construction process and the resulting performance. The objective of this project is to investigate these relationships, especially concerning the age of the recycled pavement, cumulative traffic volume, support conditions, aged engineering properties of the CIR materials, and road performance. Twenty-four CIR asphalt roads constructed in Iowa from 1986 to 2004 were studied: 18 were selected from a sample of roads studied in a previous research project (HR-392), and 6 were selected from newer CIR projects constructed after 1999. This report describes the results of comprehensive field and laboratory testing for these CIR asphalt roads. The results indicate that the modulus of the CIR layer and the air voids of the CIR asphalt binder were the most important factors affecting CIR pavement performance for high-traffic roads. For low-traffic roads, the wet indirect tensile strength significantly affected pavement performance. The results of this research can help identify changes that should be made with regard to design, material selection, and construction in order to improve the performance and cost-effectiveness of future recycled roads.
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.
An Introduction To Cold Recycling Of Asphalt Concrete Pavement For Professional Engineers
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Author : J. Paul Guyer
language : en
Publisher: Guyer Partners
Release Date : 2022-12-27
An Introduction To Cold Recycling Of Asphalt Concrete Pavement For Professional Engineers written by J. Paul Guyer and has been published by Guyer Partners this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-12-27 with Technology & Engineering categories.
Introductory technical guidance for civil engineers and other professional engineers and construction managers interested in cold recycling of asphalt concrete pavement. Here is what is discussed: 1. INTRODUCTION, 2. BACKGROUND, 3. INITIAL PROJECT SELECTION CRITERIA, 4. TRAFFIC, 5. STRUCTURAL ASSESSMENT, 6. OVERLAY THICKNESS DESIGN, 7. INITIAL STRUCTURAL SUPPORT, 8. PROJECT LENGTH, 9. CURING, 10. UTILITIES, 11. SURFACE TREATMENTS, 12. PAVING FABRICS, GEOSYNTHETICS AND CRACK SEAL, 13. PATCHES, 14. FINAL PROJECT SELECTION, 15. ECONOMIC ASSESSMENT, 16. SUMMARY, 17. SIGNIFICANT IN-PLACE RECYCLING RESOURCES, 18. REFERENCES.
Cold Recycled Bituminous Concrete Using Bituminous Materials
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Author : Jon A. Epps
language : en
Publisher: Transportation Research Board National Research
Release Date : 1990
Cold Recycled Bituminous Concrete Using Bituminous Materials written by Jon A. Epps and has been published by Transportation Research Board National Research 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.
A Field And Laboratory Study Of Cold Asphalt Mix Recycling In Ohio
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Author : Kamran Majidzadeh
language : en
Publisher:
Release Date : 1987
A Field And Laboratory Study Of Cold Asphalt Mix Recycling In Ohio written by Kamran Majidzadeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Low-volume roads categories.
This report presents a study initiated in 1984 to develop specification guidelines and mix design recommendations and to obtain performance data on cold-mix recycling projects in Ohio. Future investment planning was the motivation for the Ohio Department of Transportation to consider cold-mix recycling of local roads as a maintenance alternative. Two mainline, low volume roads and one shoulder pavement were selected for this study. Documentation and evaluation of the projects are discussed generally in two parts. The first part includes the site selection criteria, pre-construction evaluation, mix designs, construction specifications and construction monitoring. The second part discusses performance evaluation through field inspection, data collection and laboratory evaluation of material properties.