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Microstructure evaluation of polymer-modified bitumen by image analysis using two-dimensional fast Fourier transform
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0003-1779-1710
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0001-7333-1140
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0003-3968-6778
2018 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 137, p. 164-175Article 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, p. 164-175
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-218190DOI: 10.1016/j.matdes.2017.10.023ISI: 000414669500016Scopus ID: 2-s2.0-85032973707OAI: oai:DiVA.org:kth-218190DiVA, id: diva2:1162455
Note

QC 20171204

Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2017-12-04Bibliographically approved

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Zhu, JiqingBalieu, RomainKringos, Nicole

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