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Microstructure evaluation of polymer-modified bitumen by image analysis using two-dimensional fast Fourier transform
Swedish National Road and Transport Research Institute, Infrastructure, Pavement Technology. KTH.
KTH.
Nynäs AB.
KTH.
2018 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 137, 164-175 p.Article in journal (Refereed) Published
Abstract [en]

Aiming to quantitatively evaluate the microstructure of polymer-modified bitumen (PMB) for roads, this paper employs the two-dimensional fast Fourier transform (2D-FFT) to process the microscopic and numerical images of four PMBs. The related derivative parameters, including the characteristic frequency and wavelength, are computed from the 2D-FFT power spectrum. The results show that the absence/presence of a characteristic frequency (range) on the power spectrum can indicate the lack/existence of the corresponding periodical structural pattern(s) in the original PMB image. A lower characteristic frequency usually represents a coarser PMB microstructure while a higher one implies a finer PMB microstructure. The 2D-FFT method is thus valid for differentiating various PMB microstructures. The proposed method is also capable of quantitatively evaluating the effects of temperature and the temporal evolution of PMB microstructure during phase separation. As the separation continues, the decrease of characteristic frequency indicates the coarsening process of a PMB microstructure. Additionally, the numerical reproduction of the observed phase separation is evaluated with the same method. The quantitative comparison with the experimental results reveals that the simulations fairly reproduced the microscopy observation results despite some deviation. The proposed method provides a foundation for the microstructure-based modelling of PMB performance in the future.

Place, publisher, year, edition, pages
2018. Vol. 137, 164-175 p.
Keyword [en]
Polymerization, Modification, Bitumen, Image analysis, Structure (physicochem), Coarse (mater)
National Category
Other Materials Engineering
Research subject
50 Road: Materials, 51 Road: Bituminous materials and binders
Identifiers
URN: urn:nbn:se:vti:diva-12435DOI: 10.1016/j.matdes.2017.10.023OAI: oai:DiVA.org:vti-12435DiVA: diva2:1149420
Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-11-02Bibliographically approved

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Zhu, Jiqing

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • de-DE
  • en-GB
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  • nn-NB
  • sv-SE
  • Other locale
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Output format
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