Quantitative characterize binder blending and diffusion in recycled asphalt mixture: An environmental-friendly solution using wooden cube and 3D fluorescence image technology

Zou, Guilian; Zhang, Junjie; Li, Yingyong; Zhao, Lin

doi:10.1016/j.jclepro.2021.126204

Cited by 25 publications

(11 citation statements)

References 33 publications

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“…Nevertheless, previous studies mentioned that partial blending between the rejuvenator and aged bitumen was observed in most RAP recycling cases [16,17]. At the same time, the blending level significantly affected the rejuvenation efficiency, and the heterogeneous distribution of rejuvenators in aged bitumen could result in a high occurrence potential of cracking and rutting distresses [18]. Therefore, it is crucial to guarantee a high blending between rejuvenators and aged bitumen quickly.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Ren¹,

Liu²,

Gao³

et al. 2023

Materials & Design

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Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Ren¹,

Liu²,

Gao³

et al. 2023

Materials & Design

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“…According to the definition of DoB, the area method can be used to represent the blending level 30 :

S_{100 %, blend} = (S_{new} + S_{old}) \times C_{new},

DoB = [\frac{\min ((),, S_{new}, S_{old})}{S_{100 %, blend}}] \times 100 %,

where S new is the number of epoxy asphalt participating in the blending, which is expressed by the fluorescence intensity distribution curve and the area surrounded by the coordinate axis; S old is the number of old asphalt involved in the blending, subtracting S new with all epoxy asphalt (the rectangular area surrounded by the coordinate axis); the corresponding area of S new,blend when the DoB of the two asphalts is 100%; C new is the proportion of epoxy asphalt, which is 50% in this study.…”

Section: Resultsmentioning

confidence: 99%

Quantitative evaluation of asphalt blending characteristics in epoxy‐modified hot recycled asphalt mixtures based on 3D confocal fluorescence technology

Zhang,

Cheng,

et al. 2023

J of Applied Polymer Sci

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This study proposes a novel method to quantitatively evaluate the blending effect between aged asphalt and epoxy asphalt in epoxy asphalt‐modified hot recycled asphalt mixture, based on three‐dimensional confocal fluorescence microscopy technology. Samples of epoxy asphalt‐modified hot recycled asphalt mixtures were prepared in a laboratory using new aggregates, epoxy asphalt, and reclaimed asphalt pavement materials that were simulated in the laboratory by subjecting new asphalt mixtures to a short‐term and long‐term aging process. Cube‐shaped stone aggregates were designed to distinguish between new aggregates and reclaimed aggregates. The distribution of epoxy resin in the epoxy asphalt‐modified hot recycled mixtures was tracked using a laser scanning confocal microscope. To address the depth attenuation issue caused by light absorption and scattering, as well as the overall intensity differences resulting from field depth differences and attenuation morphology, a depth compensation function and a feature weight allocation method were proposed. Results from the above method indicated that the degree of blending (DoB) ranged from 65% to 75% on the surface of new aggregates but from 45% to 70% on the surface of reclaimed aggregates. Most of the old asphalt still adhered to the surface of reclaimed aggregates after migration. The proportion of epoxy asphalt in the outer layer of asphalt film on new aggregates is higher than that on reclaimed aggregates. The DoB between the asphalt binders significantly decreased as the aging degree increased. Increasing the epoxy content reduced the viscosity of the epoxy asphalt and effectively improved the DoB between the new and old asphalt binders.

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“…In addition, it was stated that the value of ΔG* R does not have a linear relationship to the layer differences, so that the gap between curves in Figure 4 at different temperatures shows different layer differences. In order to determine the statistical significance of the impact of the type of the binders, polymer modification and test temperature on the ΔG* R index, an ANOVA analysis was conducted, with the level of probalility 95% [ 14 ]. When p values are less than or equal to 0.05 value it could be interpreted that there is a significant impact of the independent variable on the tested value.…”

Section: Resultsmentioning

confidence: 99%

“…They consist of the assessment of the chemical properties of mixtures or the analysis of the microstructure of the bitumen film. Direct methods include, among others, FTIR spectrographic, GPC gel chromatography, X-ray spectroscopy or microscopy analysis [ 11 , 12 , 13 , 14 , 15 ]. The second group consists of indirect methods.…”

Section: Introductionmentioning

confidence: 99%

Homogeneity and Viscoelastic Behaviour of Bitumen Film in Asphalt Mixtures Containing RAP

2021

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This article discusses the phenomenon of fresh and RAP binders miscibility and presents test results of bitumen film properties from specially prepared asphalt mixtures. The miscibility of a fresh binder and a RAP binder still has not been fully recognised. The aim of this study was to determine the homogeneity level of the bitumen film based on viscoelastic assessment. In addition, an attempt was made to assess the impact of fresh binder on the binders blending degree. The study included assessment of homogeneity of bitumen film comprising various types of bituminous binders. The assessment was conducted on the basis of tests in the dynamic shear rheometer regarding rheological properties of the binders recovered from specific layers of the bitumen film using a staged extraction method. A complex shear modulus as a function of temperature, an elastic recovery R and a non-recoverable creep compliance modulus JNR from MSCR test were determined. The conducted statistical analyses confirmed the significant impact of the type of fresh binder on the blending degree. Regressive dependencies have been set between the differences of the complex shear modulus of the binders subject to mixing and differences of the complex shear modulus of binders from the internal and external layer of the bitumen film comprised of those binders. It was found that there is no full blending of fresh hard bitumen-simulated binder from RAP, which results in non-homogeneity of the bitumen film.

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Quantitative characterize binder blending and diffusion in recycled asphalt mixture: An environmental-friendly solution using wooden cube and 3D fluorescence image technology

Cited by 25 publications

References 33 publications

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Quantitative evaluation of asphalt blending characteristics in epoxy‐modified hot recycled asphalt mixtures based on 3D confocal fluorescence technology

Homogeneity and Viscoelastic Behaviour of Bitumen Film in Asphalt Mixtures Containing RAP

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