Effects of aging level on induced heating-healing properties of asphalt mixes

Amani, Saeed; Kavussi, Amir; Karimi, Mohammad M.

doi:10.1016/j.conbuildmat.2020.120105

Cited by 49 publications

(9 citation statements)

References 47 publications

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“…But in general, the self‐healing performance of asphalt has a strong time lag, which is not enough to repair microcracks in time and effectively 1,2 . To solve this problem, researchers have proposed a variety of methods to improve the self‐healing performance of asphalt, such as electromagnetic induction, 3–5 microwave induction, 6,7 microencapsulation, 8–11 and so forth. At present, microencapsulation has become a hot spot in the field of asphalt self‐healing, which provides a new solution to improve the healing ability of asphalt and prolong the life of asphalt pavement.…”

Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of self‐healing microcapsules for asphalt based on response surface optimization

Tang

et al. 2021

J of Applied Polymer Sci

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The purpose of this study is to explore the best preparation process of asphalt self‐healing microcapsules. Response surface design and single factor design were used to optimize the preparation process parameters of asphalt self‐healing microcapsules, and the prediction model of core content was established. The optimal preparation process was determined. The results of response surface design showed that the interaction among emulsifier concentration/reaction temperature, core‐shell ratio/reaction temperature, and pH/reaction temperature had significant effect on the core content of microcapsules; the microcapsules prepared by the optimal process were spherical with an average particle size of 90.19 μm. The results of thermogravimetric analysis (TGA) and heating simulation test showed that the microcapsule can delay the damage of the core in high temperature environment; the results of nanoindentation test showed that the young's modulus and hardness of the microcapsules were about 2.50 and 0.28 GPa, respectively. Finally, the improvement mechanism of self‐healing performance of asphalt by microcapsules was revealed by fluorescence microscope.

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Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of self‐healing microcapsules for asphalt based on response surface optimization

Tang

et al. 2021

J of Applied Polymer Sci

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“…The test simulates a ten-year service life of the pavement. Additionally, an extended long-term aging simulation process of 216 hours was carried out, which simulates approximately twenty years of pavement operation [16,17]. In order to evaluate the simultaneous influence of both factors, some samples subjected to the influence of water and frost were conditioned after long-term aging.…”

Section: Laboratory Testsmentioning

confidence: 99%

Monte Carlo simulations of the fracture resistance degradation of asphalt concrete subjected to environmental factors

2023

Archives of Civil Engineering

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The paper presents the results of laboratory tests of SCB (semi-circular beam) samples of asphalt concrete, subjected to the destructive effect of water and frost as well as the aging processes. The determined values of material parameters show significant dispersions, which makes the design of mixtures difficult. Statistical analysis of the test results supplemented by computer simulations made with the use of the proprietary FEM model was carried out. The main distinguishing feature of the model is the assignment of material parameters of coarse aggregate and bituminous mortar to randomly selected finite elements. The parameters of the mortar are selected by trial and error to match the numerical results to the experimental ones. The stiffness modulus of the bituminous mortar is, therefore, a substitute parameter, taking into account the influence of many factors, including material degradation resulting from the aging and changing environmental conditions, the influence of voids, and contact between the aggregate and the bituminous mortar. The use of the Monte Carlo method allows to reflect the scattering of the results obtained based on laboratory tests. The computational algorithm created in the ABAQUS was limited only to the analysis of the global mechanical bending response of the SCB sample, without mapping the failure process in detail. The combination of the results of laboratory tests usually carried out on a limited number of samples and numerical simulations provide a sufficiently large population of data to carry out a reliable statistical analysis, and to estimate the reliability of the material designed.

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“…In general terms, the rate of oxidation doubles with each 10 • C rise in temperature above 100 • C [6]. Thus, microwave heating can age the bitumen in the asphalt mixture, which is an unwanted effect of the crack-healing technique, the healing capability of asphalt mix decrease as the aging level increases [26]. The influence of temperature on bitumen by effect of the microwave heating was investigated for the first time by Norambuena-Contreras and Garcia [23].…”

Section: Of 18mentioning

confidence: 99%

Effects of Microwave Heating and Long-Term Aging on the Rheological and Chemical Properties of Recovered Bitumen

et al. 2021

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Microwave heating of asphalt pavement is a promising technique to reduce the maintenance and increase the service life of materials through self-healing of cracks. Previous studies have shown that microwave heating technology at high temperatures could damage the bitumen of asphalt mixture, which is an unwanted effect of the crack-healing technique. In this study, the effects of microwave heating and long-term aging on the rheological and chemical properties of recovered bitumen were quantified using a frequency sweep test and Fourier Transform Infrared Spectrometry analysis, respectively. The main results indicate that microwave heating has no significant effect on the aging performance of G* and δ for aged asphalt mixtures. However, for newer bitumens, the rheological properties G* and δ show minor changes after microwave heating was applied. Overall, this study confirms that microwave heating is a potential alternative for maintenance of asphalt pavements, without severely affecting the rheological and chemical properties of bitumen.

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Effects of aging level on induced heating-healing properties of asphalt mixes

Cited by 49 publications

References 47 publications

Preparation and evaluation of self‐healing microcapsules for asphalt based on response surface optimization

Preparation and evaluation of self‐healing microcapsules for asphalt based on response surface optimization

Monte Carlo simulations of the fracture resistance degradation of asphalt concrete subjected to environmental factors

Effects of Microwave Heating and Long-Term Aging on the Rheological and Chemical Properties of Recovered Bitumen

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