Characterization of physical aging by time-resolved rheometry

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-11-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
745-756
Series
Rheologica Acta, Volume 57, issue 11
Abstract
Physical aging is a ubiquitous phenomenon in glassy materials and it is reflected, for example, in the time evolution of rheological properties under isothermal conditions. In this paper, time-resolved rheometry (TRR) is used to characterize this time-dependent rheological behavior. The fundamentals of TRR are briefly reviewed, and its advantages over the traditional Struik’s physical aging test protocol are discussed. In the experimental section, the TRR technique is applied to study physical aging in bituminous binders. Small-diameter parallel plate (SDPP) rheometry is employed to perform cyclic frequency sweep (CFS) experiments over extended periods of time (from one to 8.6 days). The results verify that the mutation of rheological properties is relatively slow during physical aging (mutation number N′mu << 1), thus allowing rheological measurements on a quasi-stable sample. The effects of temperature, crystallinity, and styrene-butadiene-styrene (SBS) polymer modification on the physical aging of bitumen are evaluated. The time-aging time superposition is found to be valid both for unmodified and for polymer-modified bitumen. Vertical shifts are necessary, in addition to horizontal time-aging time shifts, to generate smooth master curves for highly SBS-modified bitumen.
Description
Keywords
Bitumen, Physical aging, Sample mutation, Time-aging time superposition, Time-resolved rheometry
Other note
Citation
Laukkanen , O V , Winter , H H & Seppälä , J 2018 , ' Characterization of physical aging by time-resolved rheometry : fundamentals and application to bituminous binders ' , Rheologica Acta , vol. 57 , no. 11 , pp. 745-756 . https://doi.org/10.1007/s00397-018-1114-8