Evaluation Of Properties Of Recycled Asphalt Concrete Hot Mix
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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 Properties Of Recycled Asphalt Concrete Hot Mix
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Author : Elton R. Brown
language : en
Publisher:
Release Date : 1983
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 1983 with Asphalt concrete categories.
Recycling of aged asphalt concrete pavements has been demonstrated to be cost-effective and to reduce the demand for natural resources such as aggregate and asphalt. Because of the advantages derived when using recycled materials, the capability to predict long-term performance is needed so that optimum benefits can be obtained. This study was undertaken to evaluate the laboratory performance to recycled asphalt concrete mixtures and to compare these results to those measured for conventional asphalt concrete mixtures. Results of this study indicated a satisfactory comparison between laboratory performance of recycled mixtures and conventional mixtures. Fatigue analysis indicated that conventional mixtures would provide the greatest fatigue resistance in thick asphalt concrete layers at lower temperatures, while the recycled mixtures would provide the greatest fatigue resistance in thin asphalt layers at higher temperatures. Water susceptability was shown to be related more to aggregate type than to mixture type. The data show that recycled mixtures prepared with the recycling agent produced mixtures with the lowest durability and poorest low temperature performance when compared with the recycled mixtures prepared with AC-5 or compared with the conventional mixtures.
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.
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.
Evaluation Of Various Treatment Methods For Enhancing The Properties Of Recycled Concrete Aggregate For Hot Mix Asphalt
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Author : Hanaa Al-Bayati
language : en
Publisher:
Release Date : 2019
Evaluation Of Various Treatment Methods For Enhancing The Properties Of Recycled Concrete Aggregate For Hot Mix Asphalt written by Hanaa Al-Bayati and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
The application of treated CRCA with heat treatment and short mechanical treatment leads to an increase in the rutting resistance, a decrease in the total rut depth, a slight increase in the stiffness modulus, and an increase in the rutting factor of asphalt mixtures depending on the type of CRCA. The application of treated CRCA with the pre-soaking method and short mechanical treatment results in an increase in the stiffness and rutting factor of mixtures, depending on the type of CRCA. The findings demonstrated that the mixtures that included untreated CRCA have much higher ITS values than the control mix, registering a significant increase of 68%, 70%, 85.6% and 86.7%, for the mixtures that included 30% untreated CRCA#1 and CRCA#2 in both unconditioned and conditioned samples, respectively. This is followed by the ITS values of the mixtures that included 60% untreated CRCA#1 and CRCA#2 for both unconditioned and conditioned samples with an increase of 41.4%, 49.0%, 71.5%, and 56.8%, respectively. Additionally, a reasonable improvement in the ITS values in both conditioned and unconditioned samples were recorded for the mixtures that included 30% treated CRCA with different treatment techniques compared to the mixture that included 30% untreated CRCA. Furthermore, all tensile strength ratio (TSR) values for mixtures that included untreated CRCA with different types and percentages are higher than the minimum required value of MTO specifications. This indicates a successful application for CRCA in these mixtures. The use of the combination technique of pre-soaking method with weak acid followed by a short mechanical treatment method was a highly successful method for enhancing moisture resistance of asphalt mixtures as compared to other combination methods. From TSRST test, the findings indicated that the fracture temperature is reduced due to the CRCA addition compared to the control mix. However, there is no significant influence for the RCA type on the thermal cracks at low temperatures. Additionally, the fracture stress of the mixtures that included different untreated CRCA types with various proportions is generally higher than the fracture stress of the control mix Furthermore, the application of the combination of various treatments leads to a significant reduction in the fracture temperature, indicating a successful application of treated CRCA in HMA mixtures in cold regions. However, the combination of heat at 300 °C and short mechanical treatment has a considerable impact on the fracture temperature of asphalt mixtures as compared to other combination techniques. The results of ANOVA statistical analysis showed that the type of CRCA had a significant effect on the stiffness and rutting, ITS, and the fracture temperature of asphalt mixtures. Additionally, the type of treatment method had a considerable effect on the stiffness, rutting, and fracture temperature of HMA mixtures. In contrast, both the type of treatment method and the type of CRCA have an insignificant effect on the fracture stress of asphalt mixtures. The results of cost analysis revealed that both heat and pre-soaking treatment is quite reasonable, referring to many economic benefits and indicating that these treatment methods could be applicable. In conclusion, the results of this study indicate that the application of different CRCA types in various forms: treated and untreated is very successful and can contribute greatly towards more RCA applications in the asphalt pavements.
Influences Of Preheating Temperature Of Rap On Properties Of Hot Mix Recycled Asphalt Mixture
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Author : T. Ma
language : en
Publisher:
Release Date : 2016
Influences Of Preheating Temperature Of Rap On Properties Of Hot Mix Recycled Asphalt Mixture written by T. Ma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Agglomerate categories.
This study analyzed the agglomerate characteristics of reclaimed asphalt pavement (RAP) material and evaluated the influences of the preheating temperature of RAP on the properties of recycled asphalt mixture. Specific surface-area analysis was conducted to reveal the agglomerate characteristics of RAP. A triaxial shear test was conducted for RAP with different preheating conditions to evaluate the dispersion characteristics of RAP and its influences on RAP property. Freeze-thaw splitting test, wheel tracking test, and low-temperature bending-beam test were conducted to evaluate the influences by preheating temperature of RAP on the properties of recycled asphalt mixture. It is found that, because of the agglomerates of RAP, the specific surface area of RAP is much lower than that of real aggregates. Sufficient preheating of RAP can promote the dispersion of RAP by activating the flowability of aged asphalt in RAP. The properties of recycled asphalt mixture keep improving with the increase of the preheating temperature of RAP. There is a minimum-temperature limit for RAP preheating to guarantee the properties of recycled asphalt mixture.
Engineering Properties Of Recycled Asphalt Mixtures
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Author : Thomas William Kennedy
language : en
Publisher:
Release Date : 1983
Engineering Properties Of Recycled Asphalt Mixtures written by Thomas William Kennedy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Asphalt categories.
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction
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Author : Tyson David Rupnow
language : en
Publisher:
Release Date : 2011
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction written by Tyson David Rupnow and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Cement categories.
INTRODUCTION: Many entities currently use recycled asphalt pavement (RAP) and other aggregates as base materials, temporary haul roads, and, in the case of RAP, hot mix asphalt construction. Several states currently allow the use of RAP combined with cement for a stabilized base course under both asphalt and concrete pavements. Currently, there is disagreement on what properties are required and how to test the cement and fly ash treated RAP for both asphalt and concrete pavement structures. This project investigated cement and fly ash treated RAP and other materials to determine their suitability for base course construction. OBJECTIVE: The objective of this research was to determine feasibility of cement and fly ash treated RAP and other aggregates as a structural layer for both portland cement concrete and hot mix asphalt pavement systems.
Evaluation Of Warm Mix Asphalt Technologies And Recycled Asphalt Pavements In Truckee Meadows Nevada
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Author : Cristian Diaz Montecino
language : en
Publisher:
Release Date : 2013
Evaluation Of Warm Mix Asphalt Technologies And Recycled Asphalt Pavements In Truckee Meadows Nevada written by Cristian Diaz Montecino and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Pavements, Asphalt categories.
This study evaluated the properties and laboratory performance of hot mix asphalt and warm mix asphalt mixtures with different levels of recycled asphalt pavements content. The rheological properties were evaluated for virgin and recovered recycled asphalt binders. The mixtures were evaluated for their resistance to moisture damage and permanent deformation.
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.