Effect of ageing on bitumen chemistry and rheology |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, School of Engineering, University of Connecticut, 261 Glenbrook Road, Unit 3037, Storrs, CT 06269-3037, USA;2. Road and Bridge Research Institute, Warsaw, Poland;1. School of Transportation, Southeast University, No. 2 Sipailou, Nanjing 210096, China;2. Department of Civil Engineering, The Catholic University of America, Washington, DC 20064, USA;1. Indian Institute of Technology, Kharagpur, West Bengal 721302, India;2. CSIR-Central Road Research Institute, New Delhi 110025, India |
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| Abstract: | Effect of ageing on bitumen chemistry and rheology was studied. Seven bitumens were aged according to the thin film oven test (TFOT) and the rolling thin film oven test (RTFOT). The binders were characterised using infrared spectroscopy, chromatography and dynamic mechanical analysis. Statistical correlation between different chemical parameters, as well as between chemical and rheological parameters, was examined. The relationship between TFOT and RTFOT was also investigated. It was observed that ageing influenced bitumen chemistry and rheology significantly. However, chemical and rheological changes were generally not consistent, and consequently, ageing susceptibility of bitumens may be ranked differently when different evaluation methods are used. Regardless of the type of the parameters measured, a strong correlation was observed between TFOT and RTFOT, and the two ageing procedures show similar severity. |
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