Physicochemical characterisation of severely aged crumb rubber modified bitumen
Jiayao Liu (Shaanxi Polytechnic University)
Qian Yang (Shaanxi Polytechnic University)
Yan Zhang (Shaanxi Polytechnic University)
Shaokun Wang (Shaanxi Polytechnic University)
Wei Wei (Shaanxi Polytechnic University)
Wenbin Su (Chang'an University)
Rui Wu (TU Delft - Civil Engineering & Geosciences)
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Abstract
Crumb rubber was incorporated into neat bitumen at a dosage of 15 wt% to mitigate the challenges of rising crude oil prices, high dependence on fossil fuels, and energy shortages. Both the unmodified bitumen and crumb rubber modified bitumen (CRMB) were subjected to short- and severe long-term ageing. The rheological properties were evaluated using a dynamic shear rheometer (DSR) and a bending beam rheometer (BBR) to investigate the high-, intermediate-, and low-temperature performance of the binders under different ageing conditions. Fourier-transform infrared spectroscopy (FTIR) was employed to characterise the chemical changes with modification and ageing. The results indicate that the incorporation of crumb rubber significantly enhances the high- and low-temperature performance of bitumen but slightly reduces its fatigue resistance and durability. Crumb rubber does not alter the oxidation pathway of bitumen. After severe long-term ageing, the chemical characteristics of CRMB remain comparable to those of neat bitumen.
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