Evaluation Of Modified Asphalt In Hot Mix Asphaltic Pavement
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Evaluation Of Modified Asphalt In Hot Mix Asphaltic Pavement
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Author : North Dakota. Department of Transportation. Materials and Research Division
language : en
Publisher:
Release Date : 1992
Evaluation Of Modified Asphalt In Hot Mix Asphaltic Pavement written by North Dakota. Department of Transportation. Materials and Research Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Asphalt emulsion mixtures categories.
Evaluation Of Mix Ingredients On The Performance Of Rubber Modified Asphalt Mixtures
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Author : Hossein B. Takallou
language : en
Publisher:
Release Date : 1987
Evaluation Of Mix Ingredients On The Performance Of Rubber Modified Asphalt Mixtures written by Hossein B. Takallou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Asphalt-rubber categories.
Rubber-modified asphalt pavements have been used in Sweden and the United States since the 1970's. In these applications ground recycled tire particles (1/4 inch minus) are added to a gap-graded aggregate and then mixed with hot asphalt cement. The benefits of adding rubber to the mix include increased skid resistance under icy conditions, improved flexibility and crack resistance, elimination of solid waste, and reduced traffic noise. The major disadvantage of these rubber-modified mixes is their high cost in relation to conventional asphaltic concrete pavements. This research project consisted of a laboratory study of mix properties as a function of variables such as rubber gradation and content, void content, aggregate gradation, mix process, temperature, and asphalt content. Twenty different mix combinations were evaluated for diametral modulus and fatigue at two different temperatures ( -6°C, +10°C). Also, five different mix combinations were evaluated for static creep and permanent deformation. Layered theory was used to evaluate the effects of mixture variations on pavement life. The resulting information was used to develop guidelines for use of rubber asphalt mixes in United States road systems. The findings of the field survey indicate that the rubber-modified asphalt mixture is more susceptible than the conventional mixtures to preparation and compaction problems when adverse weather or equipment problems occur. However, with adequate equipment and favorable weather conditions, the rubber-modified asphalt mixture placement is similar to conventional mixture placement. The field study also indicates that stopping distances can be reduced 20 percent for the rubber-modified pavements in icy conditions. In view of the significant reductions in wintertime stopping distances under icy or frosty road surface conditions, the use of coarse rubber in asphalt pavements should be seriously considered. This is particularly true for areas such as bridge decks, on and off freeway ramps or insulated roadway sections. The findings of the laboratory study indicate that the rubber gradation and content, aggregate gradation, and use of surcharge during sample preparation have considerable effect on modulus and fatigue life of the mix. The results of static creep and permanent deformation tests indicate that the rubber asphalt mixes had low stability and high elasticity. Also, due to greater allowable tensile strain in rubber-modified mixtures, the thickness of the modified mixture can be reduced, using a layer equivalency of 1.4 to 1.0.
Evaluation Of Polymer Modified Asphalt In Hot Mix Pavement
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Author : David F. Rogge
language : en
Publisher:
Release Date : 1988
Evaluation Of Polymer Modified Asphalt In Hot Mix Pavement written by David F. Rogge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Asphalt categories.
Evaluation Of Modified Asphalt In Hot Bituminous Pavements
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Author : North Dakota. Department of Transportation. Materials and Research Division
language : en
Publisher:
Release Date : 1996
Evaluation Of Modified Asphalt In Hot Bituminous Pavements written by North Dakota. Department of Transportation. Materials and Research Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Binders (Materials) 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.
Evaluation Of A Hot Mix Asphalt Perpetual Pavement
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Author :
language : en
Publisher:
Release Date : 2010
Evaluation Of A Hot Mix Asphalt Perpetual Pavement written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Pavements, Asphalt categories.
Evaluation Of Polymer Modified Asphalt Cements In Hot Mix Asphalt
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Author : David W. Pittman
language : en
Publisher:
Release Date : 1998
Evaluation Of Polymer Modified Asphalt Cements In Hot Mix Asphalt written by David W. Pittman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Asphalt cement categories.
Evaluation Of Engineering Properties Of Hot Mix Asphalt Concrete For The Mechanistic Empirical Pavement Design
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Author :
language : en
Publisher:
Release Date : 2009
Evaluation Of Engineering Properties Of Hot Mix Asphalt Concrete For The Mechanistic Empirical Pavement Design written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Data evaluation of the test results indicated the increase of nominal maximum size aggregate amount by 5% to 15% to the standard coarse mix designs had negligible effect on HMA fracture mechanics properties. The SBS polymer-modified asphalt binder improved the fracture mechanics behavior of asphalt mixtures comprehensively. The limestone materials hold advantages over granite materials in improving the performance of thermal cracking at low service temperatures and the rutting resistance at high service temperatures. The master curve construction and linear regression analysis indicated that the total resilient modulus increased with an increase in dynamic modulus at a specific loading frequency. The resilient modulus values were comparable with the dynamic modulus values at the loading frequency of 4 Hz. A correlation relationship was developed for predicting the dynamic modulus from existing resilient modulus values of the asphalt concrete mixture in implementing the mechanistic-empirical pavement design.
Binder Characterization And Evaluation
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Author : David A. Anderson
language : en
Publisher: Strategic Highway Research Program (Shrp)
Release Date : 1994
Binder Characterization And Evaluation written by David A. Anderson and has been published by Strategic Highway Research Program (Shrp) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Technology & Engineering categories.
An Evaluation Of Heated Reclaimed Asphalt Pavement Rap Material And Wax Modified Asphalt For Use In Recycled Hot Mix Asphalt Hma
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Author :
language : en
Publisher:
Release Date : 2007
An Evaluation Of Heated Reclaimed Asphalt Pavement Rap Material And Wax Modified Asphalt For Use In Recycled Hot Mix Asphalt Hma 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, Asphalt concrete categories.
Abstract: This study was carried out to evaluate the use of heated reclaimed asphalt pavement materials with emulsion and the use of hot mix asphalt with wax (Sasobit) as base course materials. Mixes with lower than optimum and optimum emulsion, as well as with heated reclaimed asphalt pavement material and optimum emulsion were made; also, mixes with conventional asphalt binder and those with asphalt binder and Sasobit were produced at relatively lower temperatures. These mixes were tested for workability, and all but one of the mixes were used for preparation of approximately 0.9 m (35 inches) by 0.9 m (35 inches) 0.125 m (5 inches) slabs. The rates of densification during the compaction of these slabs were compared. Samples cored from the slabs were tested for stiffness, and dry retained tensile strengths. The results showed that heating of reclaimed asphalt pavement material can improve the dispersion as well as densification significantly. The use of asphalt binder was found to be beneficial in improving strength and stiffness, and the use of Sasobit helped to achieve almost similar workabilities and compactabilities at lower temperatures, as compared to those of hot mix asphalt with neat asphalt binder. No significant difference was found between the modulus of the Sasobit and hot mix asphalt samples. The dispersion of asphalt binder seemed to improve with the use of Sasobit at lower mixing temperature. A field project is recommended for evaluating performance of emulsion mixes with heated reclaimed asphalt pavements and asphalt binder mixes with Sasobit.