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Aging Behaviour And Mechanism Of Sbs Modified Asphalt
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Book Synopsis Aging Behaviour and Mechanism of SBS-Modified Asphalt by : Tao Ma
Download or read book Aging Behaviour and Mechanism of SBS-Modified Asphalt written by Tao Ma and published by . This book was released on 2012 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aging behaviour and mechanism of styrene-butadiene-styrene (SBS)-modified asphalt has been investigated based on laboratory tests in this study. Rolling thin-film oven (RTFO) test and pressure-aging-vessel (PAV) test were conducted to prepare aged SBS-modified asphalt. Conventional property tests, including penetration, soften point, and ductility, as well as elastic recovery and SHRP property tests, including viscosity, dynamic shear rheometor (DSR) and bending-beam rheometer (BBR) tests, were mainly used to analyse the aging behaviour of SBS-modified asphalt. Then Fourier transform infrared spectroscopy (FTIR) and gel-permeation chromatography (GPC) tests were conducted to capture the aging mechanism of SBS-modified asphalt. The testing results indicated that SBS-modified asphalt has similar aging behaviour as base asphalt but better performance and anti-aging ability because of the existence of the SBS modifier. However, it is still inevitable that SBS-modified asphalt becomes aged because of thermal oxidation. The aging of SBS-modified binder consists of two parts: (i) the oxidative aging of the asphalt components, and (ii) the degradation of the SBS modifier. Because of the protective effect between asphalt and SBS polymer, the aging degrees of asphalt and SBS polymer were lower than those aged independently.
Book Synopsis Performance Evaluation of SBS Modified Asphalt with Different Anti-aging Additives by : Zhengang Feng
Download or read book Performance Evaluation of SBS Modified Asphalt with Different Anti-aging Additives written by Zhengang Feng and published by . This book was released on 2012 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of three different types of anti-aging additives (bumetrizole, octabenzone, and tinuvin770) on the physical and rheological properties of styrene butadiene styrene (SBS) modified asphalt were investigated by means of conventional physical properties tests and dynamic shear rheometer (DSR) tests. In order to evaluate the aging properties of different anti-aging additive/SBS modified asphalts, the thin film oven test and ultraviolet (UV) radiation test were performed, and different aging parameters were compared. The results show that the penetration, ductility, and softening point are increased, whereas the viscosity is decreased, with the addition of different anti-aging additives. The DSR analysis indicates that anti-aging additives can enhance the elastic behavior and improve the thermal stability of SBS modified asphalt. Improvement in the thermal-oxidative aging properties of SBS modified asphalt can be achieved with the three different anti-aging additives, but the UV aging properties of anti-aging additive/SBS modified asphalts are dependent on the type of anti-aging additive. Of the three different anti-aging additives, tinuvin770 improves both the thermal- and the photo-oxidative aging resistance of SBS modified asphalt significantly.
Book Synopsis Rapport over de economische toestand van Engeland sedert het loslaten van de gouden standaard by :
Download or read book Rapport over de economische toestand van Engeland sedert het loslaten van de gouden standaard written by and published by . This book was released on 1935* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Novel Approach to Understanding Asphalt Binder Aging Behavior Using Asphaltene Proportion as a Performance Indicator by : Yogesh Shamsunder Kumbargeri
Download or read book A Novel Approach to Understanding Asphalt Binder Aging Behavior Using Asphaltene Proportion as a Performance Indicator written by Yogesh Shamsunder Kumbargeri and published by . This book was released on 2015 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this research study was to formulate and deduce aging indices and parametric models with asphaltene as a performance indicator using virgin and modified asphalt binders. The estimated asphaltene content of binders increased from unaged to short-term and subsequently to long-term aged condition. Also, modified binders had higher asphaltene contents than virgin binders. Asphaltene content was found to be a truly valuable aging performance assessor to investigate asphalt binder aging characteristics in a rational manner. Asphalt aging parametric models were developed using asphaltene content and fundamental binder properties, which were mathematically robust. The parametric models precisely predicted rational aging performance of asphalt binders at different aging combinations. A final binder aging predictive model was recommended that relates short- and long-term aging conditions, which had excellent rational correlations. A novel approach was taken in this study that synergized asphalt binder rheological properties and aging performance criteria specifically incorporating asphaltene, which is a chemical parametric indicator pertinent to asphalt aging characterization and evaluation.
Book Synopsis Evaluation of Aging Characteristics of Modified Asphalt Mixtures by : S-C Huang
Download or read book Evaluation of Aging Characteristics of Modified Asphalt Mixtures written by S-C Huang and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A laboratory investigation using typical Florida dense-graded and open-graded mixtures was conducted to evaluate the effects of a few promising modifiers on the long-term aging characteristics of asphalt mixtures. Six types of modifiers including gilsonite, carbon black, fine ground tire rubber (GTR-80), styrene-butylene-rubber (SBR), ethylene vinyl acetate (EVA) and styrene-ethylene-butylene-styrene (SEBS) were used in this study. These modifiers were blended with AC-30, AC-20, and AC-5 base asphalts to produce a total of ten modified asphalts. These ten modified asphalt blends and the unmodified AC-30 were used to make Florida type S-1 structural course and type FC-2 friction course asphalt mixtures. These mixtures were compacted into Marshall specimens for age hardening and subsequent testing. A total of 416 compacted modified and unmodified asphalt mixture specimens were subjected to a forced-draft oven aging process for 90 days at 60 °C (140 °F), and natural sunlight for 6 months to simulate the long-term aging effects on these mixtures. These aged and unaged asphalt mixtures were evaluated by (1) resilient modulus tests at 5 and 25 °C (41 and 77 °F) and (2) indirect tensile tests at 5 and 25 °C (41 and 77 °F). The effects of cycle frequency used in the resilient modulus tests were also assessed. The test results indicate that the modified asphalt mixtures appear to have more pronounced delayed elastic behavior as compared with that of the unmodified asphalt mixtures. The fracture energy, which is characterized by means of the area of stress-strain curve, indicated that the modified binders using a base asphalt of AC-30 tend to be too brittle as they harden further with time. However, modified binders using a base asphalt of AC-5 appear to be softer than that of conventional AC-30 under typical Florida conditions.
Book Synopsis Investigation of Aging Behavior of Biorejuvenated Asphalt with Chemical and Micromechanical Methods by : Xing Cai
Download or read book Investigation of Aging Behavior of Biorejuvenated Asphalt with Chemical and Micromechanical Methods written by Xing Cai and published by . This book was released on 2019 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considering the increased application of high reclaimed asphalt pavement (high RAP) content mixtures, the biorejuvenator attracts increasing attention during the pavement maintenance and rehabilitation process, because this method can be implemented with ease and high effectiveness. However, the aging mechanism of biorejuvenated asphalt at a microscale is not well-understood. The microscale analysis provides a way to acknowledge how the biorejuvenator works. Therefore, this study aims to characterize the physical-structural and chemical changes of biorejuvenated asphalts of different aging levels at a microscale. The methodologies adopted include component analysis, atomic force microscopy (AFM), and Fourier-transform infrared spectroscopy (FTIR) In AFM tests, roughness and percentage of bee structures were compared in quantifying the surface morphology changes during aging. Correlation analysis was conducted between the microstructure and component analysis. Youngs modulus and adhesive forces were measured to quantify the micromechanical properties. FTIR spectra were used to investigate the aging mechanism. Results revealed that saturates, aromatics, resins and asphaltenes (SARA) fractions of original asphalts and biorejuvenated asphalts changed in the same way during aging. More special variations were found in aged biorejuvenated asphalt, and saturates content was discovered to determine the variation of bee structures percentage. The adhesion forces changed in different ways because of the different original asphalts, and the modulus index demonstrated that biorejuvenated asphalt aged faster than the original asphalt. The FTIR test demonstrated the new aldehyde in the biorejuvenator may be the reason for the accelerated aging of biorejuvenated asphalt.
Download or read book NCHRP Report 709 written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Oil Modification on Aging Characteristics of Asphalt Materials by : Ryan Sylla
Download or read book Effects of Oil Modification on Aging Characteristics of Asphalt Materials written by Ryan Sylla and published by . This book was released on 2015 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal induced cracking of asphalt mixtures is currently recognized as one of the primary distresses of asphalt pavements in cold climate regions. Thermal cracking is caused by cold temperatures, which results in the asphalt mixture becoming brittle and less capable of tolerating and relaxing thermally induced stresses. The contraction of the asphalt pavement due to decreasing temperature combined with the underlying base restraining any movement causes stress build up in the pavement until the ultimate strength is reached of the asphalt mixture, which leads to thermal crack formation. Although there are many proven asphalt modification methods to improve the asphalt performance at high service temperatures, oil modification is one of few methods that can address the low temperature distresses. Although the use of oil modifiers is common in today’s asphalt industry, oil modification’s effects to the aging mechanisms of the asphalt is relatively unknown. This study focuses on determining the implications on the aging process when using oil modifiers in asphalt binder and asphalt mastic phases. In this thesis three different oils (paraffinic, refined waste, and bio oil) were evaluated for their effects to the aging mechanisms in comparison with the unmodified base binder. The characterization of these materials was conducted by two approaches including: a.) Superpave linear viscoelastic approach using the Bending Beam Rheometer (BBR) and b.) Fracture mechanics approach using the Single Edge Notched Beam (SENB) test. In order to capture the effects of aging, the relative changes in performance were monitored through three stages of aging that aim to simulate the asphalt binder at different times within a pavement’s service life. The aging behavior of oil modified binders was also captured in the mastic phase, which is a more representative state of the continuous phase in an asphalt pavement in comparison to just the binder phase. Results indicate that the oil modification significantly effects the binder phase, but does not significantly affect the mastic phase. Binder results indicate the overall aging resistance of asphalt binder is slightly improved with oil modification and the time that aging occurs within the aging cycle is significantly altered in comparison with the unmodified binder. However, the refined waste oil in higher concentrations demonstrated detrimental effects to the aging characteristics of the binder. Mastic performance results showed little correlation with the binder performance indicating that the filler is a dominating factor. However, the mineral filler type (granite vs limestone) noticeably influenced the resulting performance of the mastics. Overall, this study concludes that oil modification can significantly alter the aging mechanisms of the binder, however these changes in binder performance do not correlate well to performance in the mixture phase.
Book Synopsis Molecular Dynamics Modeling and Simulation of Bitumen Chemical Aging by : Farshad Fallah
Download or read book Molecular Dynamics Modeling and Simulation of Bitumen Chemical Aging written by Farshad Fallah and published by . This book was released on 2017 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical aging of asphalt binder leads to significant changes in its mechanical and rheological properties, resulting in poor pavement behavior and distress. Various laboratory methods have been used to simulate asphalt aging during the service life of the pavement. However, controversy exists regarding the capability of these methods to predict field aging, as various factors interact with the pavement during service and the mechanism behind aging is not fully understood. The two main outcomes of chemical aging are oxidation of asphalt molecules, and change in asphalt SARA (saturate, aromatic, resin, and asphaltene) fractions. Reaction of oxygen with asphalt components forms polar viscosity-building molecules, while the change in SARA fractions upsets the balance in asphalt, giving it brittle properties. As both these factors affect the binder at the molecular level, molecular dynamic (MD) simulations can provide core insights into understanding the fundamentals of asphalt aging. This study used MD simulation to investigate the effect of each aging process on the properties of asphalt binder. In that respect, a representative model of virgin binder and eight different models of aged binder were built, including models for laboratory- and field-aged binder. Properties such as density, bulk modulus, glass transition temperature, and viscosity from different MD models were compared to distinguish between the effect of each aging mechanism on binder properties. The results showed that both aging mechanisms lead to an increase in density, bulk modulus, and viscosity of the binder. The SARA fractions of laboratory-aged binder were found to affect bulk modulus and viscosity more dramatically compared to field aged binder. However, when the oxygen content of models was considered, field-aged binder showed a larger increase in bulk modulus and viscosity compared to laboratory-aged binder. This indicates that the dominant mechanism from laboratory aging process is upset in SARA fractions, while oxidation of molecules might be a more dominant mechanism for field-aged binder. No statistically significant difference was observed between the glass transition temperature values for virgin and aged binder.
Book Synopsis Superpave Mix Design by : Asphalt Institute
Download or read book Superpave Mix Design written by Asphalt Institute and published by . This book was released on 2001-01-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ageing and the Glass Transition by : Malte Henkel
Download or read book Ageing and the Glass Transition written by Malte Henkel and published by Springer. This book was released on 2007-04-11 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding cooperative phenomena far from equilibrium is one of the fascinating challenges of present-day many-body physics. Glassy behaviour and the physical ageing process of such materials are paradigmatic examples. The present volume, primarily intended as introduction and reference, collects six extensive lectures addressing selected experimental and theoretical issues in the field of glassy systems.
Book Synopsis Proceedings of STCCE 2022 by : Nikolai Vatin
Download or read book Proceedings of STCCE 2022 written by Nikolai Vatin and published by Springer Nature. This book was released on 2022-09-29 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected contributions in the field of civil and construction engineering, as presented by international researchers and engineers at the 3rd International Scientific Conference on Socio-Technical Construction and Civil Engineering (STCCE), held in Kazan, Russia on April 21-29 2022. The book covers a wide range of topics including building constructions and structures, bridges, roads and tunnels, building materials and products, energy efficiency and thermal protection of buildings, ventilation, air conditioning, gas supply and lighting in buildings, innovative and smart technologies in construction, transport system development. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaborations.
Book Synopsis 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials by : Francesco Canestrari
Download or read book 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials written by Francesco Canestrari and published by Springer. This book was released on 2015-09-24 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents the results of RILEM TC 237-SIB (Testing and characterization of sustainable innovative bituminous materials and systems). The papers have been selected for publication after a rigorous peer review process and will be an invaluable source to outline and clarify the main directions of present and future research and standardization for bituminous materials and pavements. The following topics are covered: - Characterization of binder-aggregate interaction - Innovative testing of bituminous binders, additives and modifiers - Durability and aging of asphalt pavements - Mixture design and compaction analysis - Environmentally sustainable materials and technologies - Advances in laboratory characterization of bituminous materials - Modeling of road materials and pavement performance prediction - Field measurement and in-situ characterization - Innovative materials for reinforcement and interlayer systems - Cracking and damage characterization of asphalt pavements - Recycling and re-use in road pavements This is the proceedings of the RILEM SIB2015 Symposium (Ancona, Italy, October 7-9, 2015).
Book Synopsis Polymer Modified Bitumen by : Tony McNally
Download or read book Polymer Modified Bitumen written by Tony McNally and published by Elsevier. This book was released on 2011-09-15 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: The addition of polymers to bitumen allows the modification of certain physical properties, such as softening point, brittleness and ductility, of the bitumen. Polymer modified bitumen: Properties and characterisation provides a valuable and in-depth coverage of the science and technology of polymer modified bitumen. After an initial introduction to bitumen and polymer modified bitumen, the book is divided into two parts. Chapters in part one focus on the preparation and properties of a range of polymer modified bitumen, including polymer bitumen emulsions, modification of bitumen with poly (urethanes), waste rubber and plastic and polypropylene fibres. Part two addresses the characterisation and properties of polymer modified bitumen. Chapter topics covered include rheology, simulated and actual long term ageing studies; the solubility of bituminous binders in fuels and the use of Fourier transform infrared spectroscopy to study ageing/oxidation of polymer modified bitumen. Polymer modified bitumen is an essential reference for scientists and engineers, from both academia and the civil engineering and transport industries, interested in the properties and characterisation of polymer modified bitumen. Provides a comprehensive and in-depth coverage of the science and technology of polymer modified bitumen Focuses on the preparation and properties of a range of polymer modified bitumen, including emulsions, modification of bitumen with poly(urethanes), waste rubber and plastic as well as polypropylene fibres Addresses the characterization and properties of polymer modified bitumen, including rheology, simulated and actual long term ageing studies, and the solubility of bituminous binders in fuels
Book Synopsis Proceedings of the 10th International Conference on Maintenance and Rehabilitation of Pavements by : Paulo Pereira
Download or read book Proceedings of the 10th International Conference on Maintenance and Rehabilitation of Pavements written by Paulo Pereira and published by Springer Nature. This book was released on with total page 643 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characteristics of Asphalt Binders by :
Download or read book Characteristics of Asphalt Binders written by and published by . This book was released on 1996 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Fifth International Conference of Transportation Research Group of India by : Dharamveer Singh
Download or read book Proceedings of the Fifth International Conference of Transportation Research Group of India written by Dharamveer Singh and published by Springer Nature. This book was released on 2022-05-13 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book (in three volumes) comprises the proceedings of the Fifth Conference of Transportation Research Group of India (CTRG2019) focusing on emerging opportunities and challenges in the field of transportation of people and freight. The contents of the book include characterization of conventional and innovative pavement materials, operational effects of road geometry, user impact of multimodal transport projects, spatial analysis of travel patterns, socio-economic impacts of transport projects, analysis of transportation policy and planning for safety and security, technology-enabled models of mobility services, etc. This book will be beneficial to researchers, educators, practitioners and policymakers alike.
