Effect Of Asphalt Modification On Failure Properties Of Asphalt Binders
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Effect Of Asphalt Modification On Failure Properties Of Asphalt Binders
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Author : Kitae Nam
language : en
Publisher:
Release Date : 2001
Effect Of Asphalt Modification On Failure Properties Of Asphalt Binders written by Kitae Nam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Effect Of Polymer Modification On The Properties Of Asphalt Concrete
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Author : Alekh S. Bhurke
language : en
Publisher:
Release Date : 1999
Effect Of Polymer Modification On The Properties Of Asphalt Concrete written by Alekh S. Bhurke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Asphalt concrete categories.
Investigation Of The Effect Of Oil Modification On Critical Characteristics Of Asphalt Binders
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Author :
language : en
Publisher:
Release Date : 2013
Investigation Of The Effect Of Oil Modification On Critical Characteristics Of Asphalt Binders written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Thermally induced cracking of asphalt pavement continues to be a serious issue in cold climate regions as well as in areas which experience extreme daily temperature differentials. Low temperature cracking of asphalt pavements is attributed to thermal stresses and strains developed during cooling cycles. Improving asphalt binder low temperature fracture and stiffness properties continues to be a subject of particular concern. Therefore, significant amount of research has been focused on improving asphalt binder properties through modification. In recent years, wide ranges of oil based modifications have been introduced to improve asphalt binder performance, especially at the low service temperatures. Although, significant use of these oils is seen in practice, knowledge of the fundamental mechanisms of oil modification and their properties for achieving optimum characteristics is limited. Hence, this study focuses on better understanding of the effect of oil modifiers which would help better material selection and achieve optimum performance in terms of increasing the life span of pavements. In this study, the effect of oil modification on the rheological properties of the asphalt binder is investigated. To examine the effect of oil modification on binder characteristics, low temperature properties as well as high temperature performance of oil modified binders were evaluated. It is found that oils vary in their effects on asphalt binder performance. However, for all oils used in the study, adding an oil to binder can improve binder low temperature performance, and this result mainly attributed to the softening effect. In addition to that, a simple linear model is proposed to predict the performance grade of oil modified binder based on the properties of its constituents at high and low temperatures. Another part of this study focuses on the oil modification effect on asphalt binder thermal strain and stresses. A viscoelastic analytical procedure is combined with experimentally derived failure stress and strain envelopes to determine the controlling failure mechanism, strain tolerance or critical stress, in thermal cracking of oil modified binders. The low temperature failure results depict that oil modification has a good potential of improving the cracking resistance of asphalt binders during thermal cycles.
Physical Properties Of Asphalt Cement Binders
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Author : John C. Hardin
language : en
Publisher: ASTM International
Release Date : 1995
Physical Properties Of Asphalt Cement Binders written by John C. Hardin and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Asphalt cement categories.
A dozen papers from a December 1993 symposium in Dallas/Fort Worth, Texas. Among the topics are why the new proposed rheological properties of asphalt binders are required and how they compare to conventional properties, the development and use of the SHRP direct tension specification test, oxidatio
The Behaviour Of Nanoclay Modified Asphalt Binders And Mixtures
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Author : Liniker Lettiere Ferreira Monteiro
language : en
Publisher:
Release Date : 2022
The Behaviour Of Nanoclay Modified Asphalt Binders And Mixtures written by Liniker Lettiere Ferreira Monteiro and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Binders (Materials) categories.
Asphalt pavement is subject to stresses induced by heavy traffic loading and thermal variations during its service life. Nowadays, increasing the permissible axle loads along with the impact of climate change have caused premature failure in the flexible pavement. Enhancing the properties of asphalt binders can reduce these distresses. Among the available options, finding a cost-effective alternative for improving the used binders is a challenge to overcome. Asphalt binder modification using nano-size materials has attracted attentions in recent years. Based on this study, nanoclays can improve the properties of asphalt binders, increase the resistance of asphalt to ageing, cracking and rutting, and extend the pavement's service life cycle. The objectives of this work were to investigate the rheological and mechanical properties of nanoclay modified asphalt binders and mixtures. The behaviour of a PG 64-28 asphalt binder modified with 2% and 4% concentration of two organo-montmorillonites was studied. Furthermore, the impact of using nanoclays was investigated in asphalt mixtures' performance. The nanoclays were mixed with the asphalt using a high shear mixer, and their dispersions were analyzed by employing a Scanning Electron Microscope (SEM) device. A SARA test was conducted on the modified and unmodified binders to examine the fraction composition of saturates, asphaltenes, resins and aromatics before and after the addition of nanoclays. Also, the neat binder and the nanoclay modified binders were subjected to short-term ageing using a rolling thin-film oven (RTFO) and long-term aged using a pressure ageing vessel (PAV). The following rheological properties of the asphalt binders were investigated: (1) High-temperature performance grading of unaged samples using a dynamic shear rheometer (DSR), (2) High-temperature performance grading of RTFO-aged samples using a DSR, (3) Intermediate temperature grading of PAV-aged samples using a DSR, (5) Low-temperature performance grading using a bending beam rheometer (BBR), (4) Two-piece healing test using a DSR, (6) Frequency-Sweep tests using a DSR, (7) Mixing and Compaction temperatures using a rotational viscometer, and (8) Mixing and compaction temperatures of modified asphalt binders using a DSR. Additionally, the mechanical properties of the asphalt mixtures that were analyzed are as follows: (1) Flow and Stability and stability test, (2) Bulk specific gravity test, (3) Theoretical maximum specific gravity on loose mixtures, (4) Fatigue and healing behaviour using a four-point bending test and (5) Dynamic Modulus test on Superpave samples. The results obtained from the high-temperature grading showed that the addition of 4% organo-montmorillonites increases the high-temperature grade from 64 to 70. Also, no change was observed in the low-temperature performance of the modified samples. The two-piece healing test showed promising results for nano-modified samples, with significant improvements in the initial healing proportional to the concentration of nanoclays in the binder. The Frequency-sweep analysis, utilizing a master curve, showed an improvement in ageing resistance by adding Montmorillonites. Furthermore, the SARA test results indicated that the nanoclay modified mixtures were storage stable. The asphalt mixture samples demonstrated, by repeated flexural bending using a four-point bending apparatus, increased stiffness and life cycles of the organo-montmorillonite modified asphalt mixtures.
Effects Of Thermo Volumetric Properties Of Modified Asphalt Mixtures On Low Temperature Cracking
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Author : Kitae Nam
language : en
Publisher:
Release Date : 2005
Effects Of Thermo Volumetric Properties Of Modified Asphalt Mixtures On Low Temperature Cracking written by Kitae Nam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Modified Asphalt
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Author : Jose Luis Rivera Armenta
language : en
Publisher: BoD – Books on Demand
Release Date : 2018-09-19
Modified Asphalt written by Jose Luis Rivera Armenta and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-19 with Technology & Engineering categories.
Asphalt modification is an important area in the development of new road and pavement materials. There is an urgent demand for road materials that can minimize fracture at low temperatures and increase resistance to deformation at high temperatures. The function of asphalt is to bind aggregate to protect it from water and other harmful agents. In the beginning asphalt was ideal for this purpose, but recently traffic loads have increased and environmental factors have deteriorated more rapidly than before. Asphalt is a byproduct of crude oil in the refining process, and it is considered a complex heterogeneous mixture of hydrocarbons. Asphalt modification has become an important research area, using several methods and new materials as modifiers.
Characterization Of Modified Asphalt Binders In Superpave Mix Design
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Author : Hussain U. Bahia
language : en
Publisher:
Release Date : 2001
Characterization Of Modified Asphalt Binders In Superpave Mix Design written by Hussain U. Bahia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Technology & Engineering categories.
Rheology Of Crumb Rubber Modified Asphalt Binder And Mixes
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Author : Vikas Rameshchandra Sheth
language : en
Publisher:
Release Date : 1997
Rheology Of Crumb Rubber Modified Asphalt Binder And Mixes written by Vikas Rameshchandra Sheth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Effects Of Two Warm Mix Additives On Aging Rheological And Failure Properties Of Ashphalt Cements
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Author :
language : en
Publisher:
Release Date : 2014
Effects Of Two Warm Mix Additives On Aging Rheological And Failure Properties Of Ashphalt Cements written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Sustainable road construction and maintenance could be supported when excellent warm-mix additives are employed in the modification of asphalt. These warm-mix additives provide remedies for today's requirements such as fatigue cracking resistance, durability, thermal cracking resistance, rutting resistance and resistance to moisture damage. Warm-mix additives are based on waxes and surfactants which reduce energy consumption and carbon dioxide emissions significantly during the construction phase of the pavement. In this study, the effects of two warm mix additives, siloxane and oxidised polyethylene wax, on roofing asphalt flux (RAF) and asphalt modified with waste engine oil (655-7) were investigated to evaluate the rheological, aging and failure properties of the asphalt binders. In terms of the properties of these two different asphalts, RAF has proved to be superior quality asphalt whereas 655-7 is poor quality asphalt. The properties of the modified asphalt samples were measured by Superpave(TM) tests such as Dynamic Shear Rheometer (DSR) test and Bending Beam Rheometer (BBR) test as well as modified protocols such as the extended BBR (eBBR) test (LS-308) and the Double-Edge-Notched Tension (DENT) test (LS-299) after laboratory aging. In addition, the Avrami theory was used to gain an insight on the crystallization of asphalt or the waxes within the asphalt binder. This study has however shown that the eBBR and DENT tests are better tools for providing accurate specification tests to curb thermal and fatigue cracking in contemporary asphalt pavements.