Use Of High Volume Reclaimed Asphalt Pavement Rap For Asphalt Pavement Rehabilitation
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Use Of High Volume Reclaimed Asphalt Pavement Rap For Asphalt Pavement Rehabilitation
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Author : Nassim Sabahfar
language : en
Publisher:
Release Date : 2012
Use Of High Volume Reclaimed Asphalt Pavement Rap For Asphalt Pavement Rehabilitation 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 2012 with categories.
Because of recent rises in asphalt binder prices, state agencies and contractors are now willing to use higher volumes of reclaimed asphalt pavement (RAP). In this project, the effects of increasing RAP percentage and using fractionated RAP (FRAP) in hot-mix asphalt (HMA) mixtures have been studied. Fractionation involved processing and separating of RAP materials into at least two sizes, typically a coarse fraction and a fine fraction. This study evaluated the effects of increasing the proportions of RAP and FRAP on moisture resistance, rutting, and fatigue cracking of Superpave mixtures. Furthermore, the effect of using different sources of RAP in the mix has been investigated. HMA mixtures with five varying RAP and FRAP contents (20, 30, and 40% RAP, and 30 and 40% FRAP) were studied. The Hamburg wheel-tracking device (HWTD) test (TEX-242-F), the Kansas standard test method no. 56 (KT-56), or modified Lottman test, and the dynamic modulus test (AASHTO TP: 62-03) were used to predict moisture damage, rutting potential, and fatigue cracking resistance of the mixes. HMA specimens were made based on Superpave HMA mix design criteria for 12.5-mm (1/2-inch) nominal maximum aggregate size (NMAS) and compacted using the Superpave gyratory compactor. For the first source of RAP, results of this study showed that although mixture performance declined as the percentage of RAP increased, mixtures with even 40% RAP met minimum performance requirements. The second source of RAP, however, almost failed to meet minimum requirements even at 20% RAP. Results proved the maximum percentage of RAP allowed in the mix is highly influenced by its source. Although some improvements have been observed, especially for the second source of RAP, when RAP is compared to FRAP, FRAP does not seem to considerably affect performance of the HMA mixture.
Use Of High Volume Reclaimed Asphalt Pavement For Asphalt Pavement Rehabilitation Due To Increasing Highway Truck Traffic From Freight Transportation
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Author : Hosin Lee
language : en
Publisher:
Release Date : 2012
Use Of High Volume Reclaimed Asphalt Pavement For Asphalt Pavement Rehabilitation Due To Increasing Highway Truck Traffic From Freight Transportation written by Hosin Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Pavements, Asphalt categories.
Sawdust Ash Stabilization Of Reclaimed Asphalt Pavement
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Author : Kolawole J. Osinubi
language : en
Publisher:
Release Date : 2012
Sawdust Ash Stabilization Of Reclaimed Asphalt Pavement written by Kolawole J. Osinubi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Asphalt concrete categories.
Pavement rehabilitation and reconstruction generates large volume of reclaimed asphalt pavements (RAP) aggregates. Also, large quantities of sawdust are generated by logging industries worldwide. This paper presents results of the laboratory evaluation of the characteristics of sawdust ash (SDA) stabilized RAP with a view to determine its suitability for use as subbase and base material in flexible pavements. The RAP-SDA mixtures were subjected to British standard light (BSL) (standard Proctor) compactive effort to determine the compaction characteristics and California bearing ratio (CBR). Test results show that the properties of RAP improved with SDA treatment. The particle grading improved from 99 % coarse aggregate and 1 % fines, with AASHTO classification of A-1-a for 100 % RAP to 29-95 % coarse aggregate and 5-71 % fines, with AASHTO classification that range from A-1-a (granular materials), for the various RAP-SDA mix proportions to A-4 (silty materials) for 100 % SDA. Maximum dry density (MDD) and optimum moisture content (OMC) increased with higher SDA content in the mixes. The CBR values initially decreased with higher SDA content to a minimum value of 11 % recorded for 30%RAP/70%SDA mix and thereafter increased. With the potential of time-dependent increase in strength in view, the 90%RAP/10%SDA mix that recorded a CBR value of 26 % (soaked for 24 h) can be used as subbase material in flexible pavements. This research provides an initial lead to the evaluation of SDA stabilized RAP as highway construction material, as it is based on CBR determination, a limited parameter that does not provide information concerning all important solicitations that bases and subbases are subjected to. Further work may be encouraged to assess resilient modulus of this material under cyclic load, as well as the assessment of permanent deformation of SDA stabilized RAP. Insignificant expansion and insignificant water absorption were observed.
High Reclaimed Asphalt Pavement Rap Asphalt Mixes For Low Volume Roads
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Author :
language : en
Publisher:
Release Date : 2018
High Reclaimed Asphalt Pavement Rap Asphalt Mixes For Low Volume 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 2018 with Low-volume roads categories.
Researchers at the Texas A&M Transportation Institute developed mix design guidelines for mixtures with reclaimed asphalt pavement (RAP) content greater than 60% for use on offsystem, low volume roads (average daily traffic
Recommended Use Of Reclaimed Asphalt Pavement In The Superpave Mix Design Method
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Author : Rebecca McDaniel
language : en
Publisher:
Release Date : 2001
Recommended Use Of Reclaimed Asphalt Pavement In The Superpave Mix Design Method written by Rebecca McDaniel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Pavements, Asphalt categories.
Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content
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Author : Randy Clark West
language : en
Publisher: Transportation Research Board
Release Date : 2013
Improved Mix Design Evaluation And Materials Management Practices For Hot Mix Asphalt With High Reclaimed Asphalt Pavement Content written by Randy Clark West 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 2013 with Pavements, Asphalt categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 752: Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content describes proposed revisions to the American Association of State Highway and Transportation Officials (AASHTO) R 35, Superpave Volumetric Design for Hot Mix Asphalt, and AASHTO M 323, Superpave Volumetric Mix Design, to accommodate the design of asphalt mixtures with high reclaimed asphalt pavement contents.
Reclaimed Asphalt Pavement
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Author : Imad L. Al-Qadi
language : en
Publisher:
Release Date : 2007
Reclaimed Asphalt Pavement written by Imad L. Al-Qadi 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.
Illinois has been recycling Reclaimed Asphalt Pavement (RAP) material into hot-mix asphalt (HMA) since 1980, this research project seeks to determine the appropriate level of contribution that should be given to the residual asphalt binder in RAP.
Recycling Reclaimed Asphalt Pavement
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Author : James H. Tanski
language : en
Publisher:
Release Date : 1984
Recycling Reclaimed Asphalt Pavement written by James H. Tanski 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.
After completing a study of milling and planning flexible pavement, the next logical step was to find a use for the surplus reclaimed asphalt pavement (RAP). Recycling RAP is a concept that has garnered significant interest periodically since about 1915, whenever petroleum shortages threatened. In the mid-1970s it again became timely. From 1976 through 1983, three recycling experiments were performed on rural state highways. They were 1) a 100-percent recycled, synthetically rejuvenated top course, 2) a top course recycled untreated as a shoulder base course, and 3) an asphalt-cement rejuvenated top-course material recycled as a 35/65 base course (35-percent recycled, 65-percent virgin material), a 35/65 top course, and a 50/50 top course. In the first two experiments on-site top courses were milled, stockpiled (short-term) and later recycled, and the third material from existing stockpiles was recycled after long-term shortage.
Recycling Materials For Highways
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Author : National Research Council (U.S.). Transportation Research Board
language : en
Publisher: Transportation Research Board National Research
Release Date : 1978
Recycling Materials For Highways written by National Research Council (U.S.). Transportation Research Board 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 1978 with Nature categories.
"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.
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