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Quantitative characterization of fusion state of virgin and aged asphalt using nano-ferrous ferric oxide tracer

Journal of Traffic and Transportation Engineering(English Edition) 2024年第3期11卷 467-480页

作者： Qiang Li Song Liu Huameng Wen Zhou Zhou College of Civil Engineering Nanjing Forestry UniversityNanjing 210037China School of Transportation Southeast UniversityNanjing 211189China

The exact evaluation of the fusion rate of virgin and aged asphalt is essential to optimize the performance of the recycled asphalt mixture.The fusion rate index was developed by tracing the distribution of tracer asphalt,which contains nano-ferrous ferric oxide(nano-Fe_(3)O(4))tracer.Laboratory fusion simulation tests were performed on three types of asphalt to obtain different fusion states,and fatigue tests were performed to evaluate the influence of the fusion rate on the fatigue life of the recycled asphalt.It was found that the tracer asphalt containing 4%nano-Fe_(3)O(4)shows the optimal trace effect,and the developed fusion rate index can quantitatively characterize the influence of different factors on the fusion state of the recycled asphalt.The fusion state is closely related to the fatigue performance of recycled asphalt,and the fusion rate index can fairly evaluate its fatigue performance.The relationship between the fusion rate and the fatigue life of recycled asphalt depends on the factors that cause the fusion rate variation.Under the influence of the amount of rejuvenator,the fatigue life of recycled asphalt grows exponentially with increasing fusion rate due to enhancement of molecular motion as well as a supplement of lightweight components.Under the influence of heat preservation treatment,fatigue life increases linearly with increasing fusion rate.The proposed fusion rate index can be utilized to quantitatively characterize the fusion state of virgin and aged asphalt,thus providing a simple way to guide the practical application of recycled asphalt.

关键词： Recycled asphalt rejuvenator Tracing technique Fusion rate Fatigue

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Evaluation of Mixture Performance Recycled Asphalt Pavement Materials as Base Layer with or without rejuvenator into the Asphalt

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Journal of Wuhan University of Technology(Materials Science) 2020年第3期35卷 579-597页

作者： Alaye Quirin Engelbert Ayeditan LING XianZhang DONG Zejiao Bambou Ghislain Department of Civil Engineering Harbin Institute of TechnologyHarbin 150001China Department of Civil Engineering University of Abomey-Calavi01 BP 2009 Cotonou.Benin Department of Road and Railway Engineer-ing Harbin Institute of TechnologyHarbin 150001China

The binder properties were determined in accordance with Chinese standard such as ductility test, which allowed to measure the distance in centimeters that a standard briquette of asphalt had been stretched before breaking. Then, penetration test was carried out in order to know some properties of the asphalt, which are the hardness and the softness. Finally, softening point test was carried out in order to determine the temperature at which the bitumen attains a particular degree of softening under the specification of the test. According to Chinese standard for performance tests, firstly, Marshall test was carried out in order to measure the theoretical density, air voids, voids filled with asphalt, stability, flow, and voids in mineral aggregate of asphalt specimens. Secondly, Freeze-thaw splitting test was carried out in order to determine Splitting strength ratio. Finally, dynamic stability (rutting) test was carried out to determine average dynamic stability. Beside the tests carried out, the gradation of the extracted aggregate in accordance with American Association of State Highway and Transportation Officials was carried out to determine the dimensions of the particles weight distribution. Furthermore, both the percentage of recycled asphalt pavement materials and binder in mixture were determined to know how much of the new material during the mixture was needed. However, two specimens were used to evaluate the performance of recycled asphalt pavement materials. One specimen of recycled asphalt pavement materials was ten years old, and another one of recycled asphalt pavement materials was five years old. The results show that the conditions of the environment such as moisture, temperature, and age, decrease the ductility and penetration properties of binder when increase the softening point property of binder. Then the gradation of recycled asphalt pavement aggregate is of the required values to reuse in the mixture, while the flow ratio, the splitting strength ratio, and the dynamic stability ratio,

关键词： recycled asphalt pavement rejuvenator asphalt rutting performance

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Diffusion and Regeneration Mechanism of Waste Composite Oils rejuvenator in Aged Asphalt

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Journal of Wuhan University of Technology(Materials Science) 2021年第5期36卷 664-671页

作者：李海滨 YANG Fayong ZHANG Fan ZOU Xiaolong ZHAO Guijuan School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi'an 710054China

The physical performance of recycled asphalt was used as the main evaluation index to study the optimal range of a self-made rejuvenator.Through the penetration,viscosity and gel permeation chromatography(GPC)tests,the diffusion degree of the rejuvenator under different temperatures and time process was analyzed,and the diffusion efficiency of the rejuvenator was evaluated from the macro and micro perspective.The regeneration mechanism of the rejuvenator in the aged asphalt was also analyzed using the Fourier transform infrared spectroscopy(FTIR),scanning electron microscope(SEM)and chemical composition tests.The research results showed that the optimum rejuvenator content was about 3%.Higher temperature and longer time were beneficial to improving the permeability and diffusion of the rejuvenator.During the aging process,the light components were reduced,and more macromolecular asphaltenes were generated as well as a large number of carbonyl and sulfoxide.After diffusion and regeneration,the light components in the asphalt were supplemented,the wrinkles and gullies of the aged asphalt were almost improved to the surface state of the matrix asphalt.

关键词： recycled asphalt waste engine oil waste cooking oil rejuvenator regenerant diffusion regeneration mechanism

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A New Approach for Evaluating rejuvenator Diffusing into Aged Bitumen

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Journal of Wuhan University of Technology(Materials Science) 2011年第1期26卷 43-46页

作者：况栋梁余剑英 Key Laboratory of Silicate Materials Science and Engineering of Education Ministry Wuhan University of Technology

rejuvenator diffusing into aged bitumen was evaluated by determining penetration and chemical components of aged bitumen with rejuvenator coat before and after diffusing experiment. Effects of temperature, time and viscosity of rejuvenator on the diffusing ability of rejuvenator into aged bitumen were investigated. Results indicated that the diffusing ability of rejuvenator into aged bitumen could be enhanced with the increasing of temperature and time, however, the diffusing of rejuvenator into aged bitumen would be restricted due to the volatilization of light component and aging of rejuvenator under high temperature （over 170 ℃）. rejuvenator with low viscosity diffused into aged bitumen more easily.

关键词： bitumen aging rejuvenator diffusing

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Microscopic experimental and numerical research on rejuvenators: A review

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第2期9卷 180-207页

作者： Zhiyu Han Peiliang Cong Jian Qiu Engineering Research Center of Transportation Materials Ministry of EducationSchool of Materials Science and EngineeringChang’an UniversityXi'an 710064China Asfalt Nu C.V. Culemborg 4100 ADthe Netherlands

Prompting high content of reclaimed asphalt pavement(RAP) to be used in road building and maintenance has drawn great attention. The application of rejuvenators is an efficient way to ensure the performance of recycled asphalt mixtures. However, as various types of rejuvenators emerging, limited understanding about rejuvenation poses challenges to put effective ones into use. For precisely evaluating the performance of rejuvenators, plenty of studies were conducted to ascertain the fundamental mechanism of rejuvenating from the microscopic view. This paper provides an overview of studies focusing on the change inside asphalt after adding rejuvenators. Chemical compositions of rejuvenators were collected as basic information. Both laboratorial experiments and molecular dynamic simulations were investigated to not only compare the effectiveness of several rejuvenators but also explain the rejuvenating mechanism. Finally, functional groups of rejuvenator structures were comprehensively examined to provide global understanding about how chemical compositions influence the efficacy of rejuvenators. This review highlights that the essential capacity of a true rejuvenator is to disturb asphaltene agglomerations. Besides, the molecular structures of rejuvenators will not only affect their deagglomerating abilities but also the performances of diffusion and durability. It has been found that gel-permeation chromatography(GPC) analysis is effective in evaluating the performance of rejuvenators, while Fourier transform infrared spectroscopy(FT-IR) and SARA(saturates, aromatics, resins and asphaltenes) analysis are only suitable for assessing asphalt oxidization. In addition, comparing some tests can only detect changes, molecular dynamic simulation can reveal the mechanism both of data and vision. The results of this work can provide comprehensive knowledge for the evaluation and development of rejuvenators.

关键词： Road engineering rejuvenator Deagglomeration Molecular simulation GPC

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Investigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oil

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第4期6卷 396-406页

作者： Hamed Majidifard Nader Tabatabaee William Buttlar Department of Civil and Environmental Engineering University of MissouriColumbiaMO 65211USA Department of Civil Engineering Sharif University of TechnologyTehranIran

The environmental and economic benefits of recycling asphalt pavements have received much attention in recent years. Because of the increase in the cost of raw materials and energy carriers, the reuse of large portions of reclaimed asphalt pavement(RAP) is critical in reducing both the cost and environmental footprint of asphalt pavements. High-RAP mixtures are more prone to low temperature cracking and poor mixture workability because of the higher stiffness of RAP binder. Recycling agents are one of the additives which are used to improve these deficiencies. However, there is some ambiguity about the optimum content of recycling agent to assure proper performance of recycled asphalt pavement during its service life. The current study used 60% and 100% fractionated RAP with waste cooking oil as a recycling agent and crumb rubber to alleviate the aforementioned problems. Laboratory evaluation showed that increasing the amount of recycling agent in the high-RAP mixtures improved their workability and low temperature performance while decreasing moisture damage and rutting resistance. The long-term susceptibility to aging of recycled binder with the organically-based recycling agent was also investigated. A procedure to obtain the optimum percentage of recycling agent was devised to strike a balance between the performance characteristics of mixtures with a high-RAP content.

关键词： Asphalt Recycling RAP Cracking Recycling agent rejuvenator

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Performance assessment of aged binder rejuvenated with Polanga oil

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第6期6卷 608-620页

作者： Sujit Kumar Pradhan Umesh Chandra Sahoo School of Infrastructure Indian Institute of Technology BhubaneswarOdisha 752050India

Presently,there is a necessity of increasing the reclaimed asphalt pavement(RAP)content in recycling of asphalt pavements to save material cost,preserve energy and protect the environment and efforts are being made to utilize 100%RAP in the mixes.RAP binder is usually stiff due to oxidation and loss of volatiles.So addition of high amount of RAP to the asphalt mix,may make it prone to fatigue failure.Due to this reason,rejuvenators are added to restore some of the physical and chemical properties for desired performance of the mixture.In this study,a locally available non-edible oil known as Polanga oil(biological name:Calophyllum inophyllum)has been explored as rejuvenator to study its effect on performance of the aged binders.Aged binder prepared in the laboratory using the Pressure Aging Vessel(PAV)and binder extracted from the RAP collected from a nearby source were used in this study for rejuvenation.Aged binder and RAP binder mixed with the rejuvenator at varying percentages.The rheological characterizations in terms of flow,rutting,fatigue and creep recovery of rejuvenated PAV aged&RAP binders were carried out using a dynamic shear rheometer(DSR)to determine the optimum dosage of the rejuvenator.It was observed that,5 percent of Polanga oil is able to divulge the desirable rheological properties of the rejuvenated binder.

关键词： Virgin bitumen Reclaimed asphalt pavement rejuvenator Polanga oil Aged bitumen Rheology

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Influence of rejuvenators on bitumen ageing in hot recycled asphalt mixtures

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Journal of Traffic and Transportation Engineering(English Edition) 2018年第3期5卷 157-168页

作者： Giorgia Mazzoni Edoardo Bocci Francesco Canestrari Department of Civil and Construction Engineering and Architecture Università Politecnica delle Marche Faculty of Engineering eCampus University

The use of reclaimed asphalt pavement （RAP） in new hot mix asphalt （HMA） by means of hot recycling techniques generates the advantage linked to the exploitation of both lytic and bituminous component, consequently leading to the decrease of both virgin aggregates and bitumen supplying. However, many agencies and public administration authorise RAP percentages ranges from 10% to 30% in hot recycling. The main reason for such a low amount of allowable RAP content is related to the aged bitumen contained in the RAP materials, which is more brittle than a virgin bitumen leading to a final mixture more susceptible to fatigue, thermal and reflection cracking. The use of rejuvenators has the potential to restore rheology and chemical components of aged RAP bitumen, thus allowing a significant increase in the amount of RAP to be properly implemented in HMA. The experimental investigation is described in this paper and carried out through a dynamic shear rheometer （DSR） which provides the rheological characterisation of a paving grade bitumen during its overall service life including its reuse in hot recycling by adopting different rejuvenators. Results show that rejuvenators modify bitumen chemistry and consequently rheology by enhancing the viscous response. Moreover, it was observed that oxidation is less harmful, in terms of stiffness increase, on the 50/50 aged bitumen - virgin bitumen blends （rejuvenated or not） than on the virgin bitumen. Moreover, the addition of a rejuvenator in a bituminous blend containing 50% of bitumen reactivated from RAP could lead to a corresponding composite bituminous phase less subjected to ageing phenomena and even less stiff at the end of service life than the associated virgin bitumen alone.

关键词： rejuvenator Reclaimed asphalt pavement Bitumen Ageing Dynamic shear rheorneter （DSR）

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New Binders Using Natural Bitumen Selenizza

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Journal of Traffic and Transportation Engineering 2020年第1期8卷 29-46页

作者： Edith Tartari Selenice Bitumi Sha R&D DepartmentRruga Gjik KuqaliPallati MelroseTirana 1019Albania

The purpose of this paper is to highlight the benefits of using natural bitumen as part of the emerging environmental sustainability innovations and trends in asphalt mixture design.Various recent studies have analyzed the characteristics of natural bitumens showing that they are totally compatible with bitumens from refineries and their influence may be compared to that of chemical additives.More particularly,the use of natural bitumen Selenizza,not only increases the binder consistency,viscosity,and stability,but it confers on the modified bitumen,increased resistance to aging,and leads to an improved low-temperature behavior compared to equivalent penetration grade straight run bitumen.The high modulus asphalt mixes obtained with binders modified with natural bitumen,allow successfully facing up the growing volume of the traffic while achieving efficient pavement structures with thinner and more durable layers.This paper specifically presents the main conclusions of recent research work focusing for the first time on the use of vegetable oils(rapeseed and sunflower)to soften natural bitumen Selenizza aiming to develop a new type of binder for asphalt mixes and introduces an experimental investigation of a new High Modulus Asphalt Concrete(HMAC),incorporating 100%reclaimed asphalt pavement(RAP)aggregates thanks to a rejuvenator composed of waste vegetable oil and natural bitumen Selenizza which reverses the aging rheological binder properties and restores the fresh bitumen values.

关键词： Natural bitumen aging vegetable oil rejuvenator RAP Selenizza

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