期刊
SUSTAINABILITY
卷 14, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/su14116915
关键词
SBS-modified bitumen; short-term ageing; UV irradiation; FTIR analysis
资金
- Italian Ministry of University and Research [PRIN 2017 USR342]
- ERDF Regional Operational Programme Sicily 2014-2020 (POR FESR Sicilia 2014-2020), Action 1.1.5 SMARTEP
This study investigates the ageing behavior of different penetration-grade bitumens and SBS-modified bitumens. The results demonstrate that SBS addition improves the thermal stability and UV ageing resistance of the bitumen.
To obtain road bitumen with improved temperature and fatigue resistance, polymers and/or rubbers could be added to it. A particularly suitable polymer for bitumen modification is styrene-butadiene-styrene (SBS) copolymer but limited information is available about the ageing behaviour of modified binders. In this work, two neat bitumens, with different penetration grades, and two SBS-modified bitumens, containing different SBS amounts, were selected, and their short-term and UVB ageing behaviour were investigated considering dynamic shear rheometry and Attenuated Total Reflectance-Fourier Transformation InfraRed spectroscopy (ATR-FTIR). Short-time ageing behaviour was investigated performing the rolling thin film oven test (RTFOT), while artificial UV ageing was examined/investigated using UVB lamps. The structural changes in bitumen were monitored at different UV exposure times. All the results suggest that the bitumen having higher penetration grade is more stable than the one with a lower penetration grade in the RTFOT ageing condition, and SBS addition exerts a beneficial effect on thermal stability during processing. Further, SBS addition also has a beneficial effect on the UV ageing resistance of bitumen, reducing its oxidation tendency.
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