Glass Transitions in Complex Bituminous Binders [PPT]

Abstract (2022)

Authors

P. Apostolidis Pavement Engineering - CEG
Laurent Porot Kraton Polymers B.V.
Michael Elwardany Western Research Institute
Stefan Vansteenkiste Belgian Road Research Centre (BRRC)
Emmanuel Chailleux Gustave Eiffel University
Research Group
Pavement Engineering (CEG) (TU Delft)
Copyright: © 2022 P. Apostolidis, Laurent Porot, Michael Elwardany, Stefan Vansteenkiste, Emmanuel Chailleux
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Published Date

2022

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Pavement Engineering

Abstract

The RILEM TC 272 PIM (Phase and Interphase behaviour of innovative bituminous Materials) – TG1 Binder has initiated an inter-laboratory program investigating the phase and interphase behaviour of bituminous binders. Five laboratories evaluated the low temperature properties of seven standard and complex binders with differential scanning calorimetry (DSC). DSC has been accepted as a powerful tool to evaluate, among others, the glass transitions, Tg, monitoring the endothermic or exothermic heat flow of a material under controlled temperature conditions. There are different ways to run the test, conventional temperature linear-DSC (TL-DSC), and temperature modulation-DSC (TM-DSC). The latter has been proven as an efficient method differentiating the structural relaxation phenomena from the heat capacity. In this study, emphasis was laid on comparing the Tg measured by TL- and TM-DSC improving the interpretation of binder glass transitions. To restrain the scope of this study, two SBS polymer modified binders (PmBs), a commercially available PmB and an highly modified PmB (7.5 % SBS) , were evaluated and compared with two neat bituminous binders. It was observed that the modification by 7.5% SBS resulted in a decrease of the Tg. This reduction of Tg reflects the positive influence of SBS at low temperatures.