Changes of components and rheological properties of bitumen under dynamic thermal aging

Liu, Jianan; Wang, Zhenjun; Luo, Rui; Bian, Guan; Liang, Qingyun; Yan, Fengfeng

doi:10.1016/j.conbuildmat.2021.124501

Cited by 44 publications

(7 citation statements)

References 31 publications

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“…In this study, the contents of the four components of fber asphalt were determined using a rod thin-layer chromatography analyzer to quantitatively evaluate the adsorption of the fbers in the asphalt components, based on a fber content of 2% [13]. To determine the reasons contributing to the change in the adsorption capacity of the modifed straw fbers and the efects of the latter on the macroscopic properties of asphalt, SEM tests were performed on the straw fbers.…”

Section: Microscopic Testmentioning

confidence: 99%

Road Performance and Microscopic Mechanism Analysis of Modified Straw Fiber Asphalt Binder

Wang

et al. 2023

Advances in Materials Science and Engineering

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In this study, the correlation between the microstructure of straw fibers and the macroscopic properties of asphalt binders is investigated. Penetration, softening point, bending beam rheometer, and toughness tests are performed to investigate the relationship between the pavement properties of fiber asphalt binders and each of the fiber types and contents. Subsequently, a four-component test, SEM, Fourier transform infrared microscopy, and fluorescence microscope tests are performed to analyze the microstructure of the straw fiber and its effect on asphalt properties. The results show that the high-temperature performance and shear resistance of the asphalt binder were enhanced with an increase in the modified straw fiber content. The low-temperature performance and toughness of the asphalt binder were reduced because of excessive fiber, and the recommended fiber content is 1.5%–2.0%. The adsorption capacity of the modified straw fiber for the light components of asphalt increased by 5.4% on average, and the low-temperature creep capacity of asphalt decreased by 9.6%. The surface roughness of the straw fiber increased via modification, and the shear resistance, high-temperature deformation resistance, and stress relaxation ability of the asphalt increased by 23.1%, 6.5%, and 5.7%, respectively. The comprehensive properties of the asphalt binder with modified straw fiber are similar to those of lignin fiber.

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Section: Microscopic Testmentioning

confidence: 99%

Road Performance and Microscopic Mechanism Analysis of Modified Straw Fiber Asphalt Binder

Wang

et al. 2023

Advances in Materials Science and Engineering

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“…The aged asphalt gradually became hard and brittle, especially after the dynamic peak temperature was 200 °C. Through dynamic thermal aging, the roughness and height of the bee structures decreased [ 117 ]. The researchers also found that with the increase in the aging degree, the ductility of the asphalt decreased, but the critical temperature at low temperature increased.…”

Section: Afm Data Analysismentioning

confidence: 99%

“…In recent years, researchers have found that with the increase in dynamic thermal aging cycles, the contents of saturated hydrocarbons and aromatic hydrocarbons in asphalt decreased, and the asphaltene content increased significantly [116]. The aged asphalt gradually became hard and brittle, especially after the dynamic peak temperature was 200 • C. Through dynamic thermal aging, the roughness and height of the bee structures decreased [117]. The researchers also found that with the increase in the aging degree, the ductility of the asphalt decreased, but the critical temperature at low temperature increased.…”

Section: Effect Of Aging and Rejuvenatingmentioning

confidence: 99%

Application of Atomic Force Microscopy as Advanced Asphalt Testing Technology: A Comprehensive Review

et al. 2022

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In the past three decades, researchers have engaged in the relationship between the composition, macro performance, and microstructure of asphalt. There are many research results in the use of atomic force microscopy (AFM) to study the microstructure and related mechanisms of asphalt. Based on previous studies, the performance of asphalt from its microstructure has been observed and analyzed, and different evaluation indices and modification methods have been proposed, providing guidance toward improving the performance of asphalt materials and benefiting potential applications. This review focuses on the typical application and analysis of AFM in the study of the aging regeneration and modification properties of asphalt. Additionally, this review introduces the history of the rheological and chemical testing of asphalt materials and the history of using AFM to investigate asphalt. Furthermore, this review introduces the basic principles of various modes of application of AFM in the microstructure of asphalt, providing a research direction for the further popularization and application of AFM in asphalt or other materials in the future. This review aims to provide a reference and direction for researchers to further popularize the application of AFM in asphalt and standardize the testing methods of AFM. This paper is also helpful in further exploring the relationship between the microstructure and macro performance of asphalt.

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“…Demand to build sustainable roads is inevitably increasing because of the fact that bitumen is a petroleum-based material, which is an exhaustible resource and its value of it has increased substantially over the last couple of decades [1]. Temperature variations and traffic loads significantly accelerate the aging process of asphalt during its service life [2][3][4]. In many countries, the utilization of Recycled Asphalt Pavement (RAP) has emerged as an ideal alternative to overcome the environmental and economic hazards of asphalt pavement reconstruction activities [5,6].…”

Section: Introductionmentioning

confidence: 99%

Feasibility and mixture performance assessment of waste oil based rejuvenators in high-RAP asphalt mixtures

Özdemir

Dokandari

Raufi

et al. 2023

Mater. Res. Express

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Asphalt pavements are amongst the most recycled materials in the contemporary world depending on the environmental and financial advantages. The introduction of Recycled Asphalt Pavement (RAP) on newly produced asphalt pavement is possible by the utilization of rejuvenating agents, which should contain oily fractions. For this purpose, within the scope of this study, three types of agents with optimum amounts (by weight of bitumen) were utilized 5.4% Waste Engine Oil (WEO), 5.1% Waste Vegetable Oil (WVO), and 6.8% Commercial Rejuvenating Agent (CRA). The highest applicable RAP content in mixtures depends on the rejuvenator type determined by Marshall Mix Design tests (air voids, flow, and stability). Rejuvenation facilitated the use of 50 to 60% of additional RAP material in the mixtures depending on the rejuvenator type. Indirect Tensile Strength (ITS) test results declared that RAP mixtures, when subjected to the rejuvenation process, resulted in relatively less brittleness and enhanced durability properties compared to the unmodified ones. Additionally, cost comparison analyses demonstrated encouraging results as the cost-benefit ratio exceeded up to 55% for mixtures involving high percentages of rejuvenated RAP. As a final analysis, Return on Investment (ROI) values were calculated for each rejuvenator type by the cost of upgrading the facility to handle RAP and the profit of RAP usage. Consequently, ROI was calculated as a return time in months, which unveils an extremely profitable opportunity in the industry.

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Changes of components and rheological properties of bitumen under dynamic thermal aging

Cited by 44 publications

References 31 publications

Road Performance and Microscopic Mechanism Analysis of Modified Straw Fiber Asphalt Binder

Road Performance and Microscopic Mechanism Analysis of Modified Straw Fiber Asphalt Binder

Application of Atomic Force Microscopy as Advanced Asphalt Testing Technology: A Comprehensive Review

Feasibility and mixture performance assessment of waste oil based rejuvenators in high-RAP asphalt mixtures

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