Evaluation of ageing in asphalt cores using low-field nuclear magnetic resonance
| Autor: | Eyad Masad, Ilaria Menapace, Emad Kassem, Georgios Papavassiliou |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
business.industry 020209 energy 0211 other engineering and technologies 02 engineering and technology Low field nuclear magnetic resonance Asphalt concrete Viscosity Mechanics of Materials Ageing Transverse Relaxation Time Asphalt 021105 building & construction Dynamic shear rheometer 0202 electrical engineering electronic engineering information engineering Air voids Composite material business Civil and Structural Engineering |
| Zdroj: | International Journal of Pavement Engineering. 17:847-860 |
| ISSN: | 1477-268X 1029-8436 |
| DOI: | 10.1080/10298436.2015.1019503 |
| Popis: | This paper introduces an innovative methodology for estimating the ageing of asphalt concrete cores without extracting the binder. Asphalt concrete samples at different ageing stages (unaged, 3-month and 6-month aged) and with different percent air voids (4%, 7% and 10%) were analysed with low-field nuclear magnetic resonance (NMR). The transverse relaxation time T2 and relative hydrogen index (RHI) obtained from NMR measurements were related to the viscosity of the asphalt binder. The samples were analysed during cooling from 70°C to room temperature, showing increase in viscosity with decreasing temperature. There was a clear trend indicating higher viscosities in samples that were aged for a longer period and samples with higher percent air voids. The RHI and T2 values obtained from low-field NMR measurements and the viscosity data calculated from measurements using a dynamic shear rheometer were correlated to develop a model that relates viscosity with RHI. |
| Databáze: | OpenAIRE |
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