Effects Of Two Warm Mix Additives On Aging Rheological And Failure Properties Of Ashphalt Cements
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Effects Of Two Warm Mix Additives On Aging Rheological And Failure Properties Of Asphalt Cements
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Author : Isaac Omari
language : en
Publisher:
Release Date : 2014
Effects Of Two Warm Mix Additives On Aging Rheological And Failure Properties Of Asphalt Cements written by Isaac Omari 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.
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.
Effects Of Warm Mix Additives And Dispersants On Rheological Aging And Failure Properties Of Asphalt Cements
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Author : Senthil Kumar Paul Samy
language : en
Publisher:
Release Date : 2013
Effects Of Warm Mix Additives And Dispersants On Rheological Aging And Failure Properties Of Asphalt Cements written by Senthil Kumar Paul Samy 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.
Effect Of Crumb Rubber And Warm Mix Additives On Asphalt Aging Rheological And Failure Properties
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Author : Prashant Agrawal
language : en
Publisher:
Release Date : 2014
Effect Of Crumb Rubber And Warm Mix Additives On Asphalt Aging Rheological And Failure Properties written by Prashant Agrawal 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.
Asphalt-rubber mixtures have been shown to have useful properties with respect to distresses observed in asphalt concrete pavements. The most notable change in properties is a large increase in viscosity and improved low-temperature cracking resistance. Warm mix additives can lower production and compaction temperatures. Lower temperatures reduce harmful emissions and lower energy consumption, and thus provide environmental benefits and cut costs. In this study, the effects of crumb rubber modification on various asphalts such as California Valley, Boscan, Alaska North Slope, Laguna and Cold Lake were also studied. The materials used for warm mix modification were obtained from various commercial sources. The RAF binder was produced by Imperial Oil in their Nanticoke, Ontario, refinery on Lake Erie. A second commercial PG 52-34 (hereafter denoted as NER) was obtained/sampled during the construction of a northern Ontario MTO contract. Some regular tests such as Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR), Multiple Stress Creep Recovery (MSCR) and some modified new protocols such as the extended BBR test (LS-308) and the Double-Edge Notched Tension (DENT) test (LS-299) are used to study, the effect of warm mix and a host of other additives on rheological, aging and failure properties. A comparison in the properties of RAF and NER asphalts has also been made as RAF is good quality asphalt and NER is bad quality asphalt. From the studies the effect of additives on chemical and physical hardening tendencies was found to be significant. The asphalt samples tested in this study showed a range of tendencies for chemical and physical hardening.
Bituminous Mixtures And Pavements Vi
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Author : A. Nikolaides
language : en
Publisher: CRC Press
Release Date : 2015-07-28
Bituminous Mixtures And Pavements Vi written by A. Nikolaides and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-28 with Technology & Engineering categories.
Bituminous Mixtures and Pavements contains 113 accepted papers from the 6th International ConferenceBituminous Mixtures and Pavements (6th ICONFBMP, Thessaloniki, Greece, 10-12 June 2015). The 6th ICONFBMP is organized every four years by the Highway Engineering Laboratory of the Aristotle University of Thessaloniki, Greece, in conjunction with
Investigation Of Different Factors Affecting Asphalt Cement Ageing And Durability
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Author : Yashar Azimi Alamdary
language : en
Publisher:
Release Date : 2019
Investigation Of Different Factors Affecting Asphalt Cement Ageing And Durability written by Yashar Azimi Alamdary 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 cement categories.
Asphalt cement is an organic material and, like any other organic material tends to react with atmospheric oxygen, thus changing its physical properties (more accurately rheological properties) gradually over time. Although there is no doubt that chemical changes happen in asphalt cement due to gradual oxidation, it is not the only factor resulting in changes in asphalt cement properties over time. Other factors such as loss of volatiles, the selective absorbance of lighter oily molecules by the aggregates' surface, molecular reorientation, and so forth, could lead to changes in asphalt cement properties, most of which result in hardening. The alteration in physical properties of asphalt cement during construction and its performance period is called ageing. The severity of the age-hardening significantly depends on environmental factors such as temperature, latitude (which affects the angle of sunshine radiation), humidity, ultraviolet, etcetera, as well as mixture properties (such as aggregate gradation, aggregate type, air-void distribution, filler composition, and additive's properties). There are several conditioning procedures to simulate short- and long-term ageing for both asphalt cement and mixes. Unfortunately, most of the existing methods are using excessively high conditioning temperatures and not realistic conditioning parameters. This project aims to identify the importance of less considered factors, such as the possible catalytic effect of minerals, solar radiation, and humidity conditioning and to define a laboratory long-term age conditioning procedure for asphalt mixes by considering different affecting factors to enable designers to include an ageing mechanism in their predictions. To reach to the goals of this project, compacted asphalt mix samples prepared using aggregates with different petrology and conditioned using standard (AASHTO R30) procedure and bespoke methods to include as much as environmental factors as possible. Complex (Dynamic) Modulus test will be used to evaluate the changes in the rheological behaviour of mixes. The 2S2P1D model fitted on laboratory results and used to investigate the rheological behaviour. Asphalt cement of the conditioned mixes extracted for further investigation on the rheological and chemical changes in asphalt cement. Frequency sweep test performed on extracted asphalt cement and results were processed using the 2S2P1D model. FT-IR spectroscopy was also used to investigate the change in the chemistry of asphalt cement by following the changes in carbonyl and sulfoxide indices and the ratio between them. Thermal sensitivity of rheological properties of both asphalt mix and asphalt cement was also investigated using time-temperature superposition shift-factors and utilizing Arrhenius and William-Landel- Ferry (WLF) theorems to further investigate the effect of different age conditioning and aggregates. Results of this research confirmed the effect of iron sulphide oxidation products in altering the chemistry of changes during ageing, while it didn't capture significant acceleration in the process. Moreover, it was found that the coupling water treatment with solar radiation can effectively age asphalt mix samples and the product of ageing using these parameters are considerably different from extended heating procedures.
The Effects Of Asphalt Binder Oxidation On Hot Mix Asphalt Concrete Mixture Rheology And Fatigue Performance
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Author : Sung Hoon Jung
language : en
Publisher:
Release Date : 2010
The Effects Of Asphalt Binder Oxidation On Hot Mix Asphalt Concrete Mixture Rheology And Fatigue Performance written by Sung Hoon Jung and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Asphalt oxidation causes major changes to binder properties and is hypothesized to be a major contributor to age-related pavement failure such as fatigue cracking. Extensive laboratory aging research has been done to assess the effects of oxidation on binder properties. Previous work shows binder oxidation makes the binder stiffer and more brittle, leading to higher binder stresses under a given deformation. Failure occurs when these stresses exceed the strength of the binder. However, binder oxidation in pavements has not been studied in the same detail as laboratory aging of neat binders. The impact of binder oxidation on long-term pavement performance has been either underestimated or ignored. This research includes studies of binder oxidation in Texas pavements to compare the field aging with laboratory neat binder aging, the impact of binder oxidation on HMAC mixture aging and HMAC mixture fatigue performance, and fundamental rheological property changes of the binder and the mixture. Binder oxidation is studied in fifteen pavements from locations across Texas. Results indicate that unmodified binders in pavements typically oxidize and harden to a degree that exceeds generally accepted pavement aging assumptions. This hardening may also extend much deeper into the pavement than has been previously assumed or documented. Data suggest that pavements can oxidize at rates surprisingly uniform with depth once early oxidation occurs, and that these rates continue for an extended time. Laboratory-aged HMAC mixtures and binders were tested and analyzed for fatigue resistance and their rheological properties. Mixture aging shows the same aging mechanisms as neat binder aging. Both binder and mixture have a higher modulus with aging and a good rheological correlation. The decline in mixture fatigue life (determined using the calibrated mechanistic fatigue analysis approach with surface energy measurement) due to oxidation is significant. Pavement service life is dependent on the mixture, but can be estimated by a cumulative damage approach that considers binder oxidation and pavement loading rate simultaneously. The differences in expected pavement life arise from differences in the rate of binder stiffening due to oxidation and the impact of this stiffening on the decline of fatigue life.
Proceedings Of The 10th International Conference On Maintenance And Rehabilitation Of Pavements
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Author : Paulo Pereira
language : en
Publisher: Springer Nature
Release Date :
Proceedings Of The 10th International Conference On Maintenance And Rehabilitation Of Pavements written by Paulo Pereira and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Binder Rheology And Performance In Warm Mix Asphalt
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Author : Zelalem Arega
language : en
Publisher:
Release Date : 2012
Binder Rheology And Performance In Warm Mix Asphalt written by Zelalem Arega 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.
Since the introduction of warm mix asphalt (WMA) in the United States, a variety of different technologies and processes have been developed and used to achieve proper mixing and compaction at reduced temperatures compared to conventional hot mix asphalt (HMA). A better understanding of the effect of WMA additives and reduced aging on the rheology of asphalt binders is a crucial step towards the successful implementation of WMA. This report presents the findings from a study conducted to investigate the influence of chemical WMA additives and reduced short-term aging on the properties of asphalt binders, mortars, and mixtures. This report presents the details of the test methods and findings relevant to mortars and mixtures prepared using warm mix additives.
Evaluation Of Warm Mix Additives For Use In Modified Asphalt Mixtures
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Author : Corina Borroel Wong
language : en
Publisher:
Release Date : 2011
Evaluation Of Warm Mix Additives For Use In Modified Asphalt Mixtures written by Corina Borroel Wong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Thesis categories.
The intention of this research effort is to evaluate the use of warm mix additives with typical polymer-modified and terminal blend tire rubber asphalt mixtures from Nevada and California. The research effort is broken into three phases that are intended to evaluate the impacts of warm mix additives with typical polymer-modified and terminal blend tire rubber asphalt mixtures from Nevada and California: moisture damage, performance characteristics, and mechanistic analysis. In Phase I of this research effort, mixture resistance to moisture damage was evaluated using the indirect tensile test and the dynamic modulus at multiple freeze-thaw cycles. Laboratory testing was conducted to address the following: (1) the impact of warm mix additive and reduced production temperatures on the moisture damage resistance of asphalt mixtures, (2) the impact of residual aggregate moisture on the moisture damage resistance of WMA mixtures, (3) the impact of warm mix additives on the moisture damage resistance of anti-strip treated WMA mixtures, and (3) the impact of long-term aging on strength gain and the moisture damage resistance of WMA mixtures. A total of one aggregate source, four warm mix asphalt technologies (Advera, Sasobit, Revix and Foaming) and three asphalt binder types (neat, polymer-modified and terminal blend tire rubber modified asphalt binders) typically used in both Nevada and California are being evaluated in this study. This thesis will only summarize the test results and findings of the Phase I of the study for two warm-mix additives: Advera and Sasobit. The evaluation of the other two technologies (i.e. Revix and Foaming) as well as the Phase II testing are still in progress and have not been completed.