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المؤلفMenapace, Ilaria
المؤلفd'Eurydice, MarcelNogueira
المؤلفGalvosas, Petrik
المؤلفHunter, Mark W.
المؤلفSirin, Okan
المؤلفMasada, Eyad
تاريخ الإتاحة2020-09-20T08:35:37Z
تاريخ النشر2017
اسم المنشورMaterials Characterization
المصدرScopus
الرقم المعياري الدولي للكتاب10445803
معرّف المصادر الموحدhttp://dx.doi.org/10.1016/j.matchar.2017.01.029
معرّف المصادر الموحدhttp://hdl.handle.net/10576/16179
الملخصIn this study, a recently developed methodology to assess aging of pavements by using Low Field Nuclear Magnetic Resonance (LF-NMR) was applied to asphalt mix samples at different aging states. The ultimate objective of this method is to monitor the long-term aging of asphalt binder in mixture cores without binder extraction. The asphalt samples were long-term aged at 70C for different durations. At the end of this process, specimens were heated again to 70C and measured in the LF-NMR while cooling to room temperature. Lower cumulative amplitudes were found in samples that were aged for longer durations. An NMR probe that can detect shorter transverse relaxation times T2 was used in order to increase the accuracy of the method. The unaged asphalt binder was measured as temperature dropped from 80 to 40C and it was observed that the cumulative amplitude was fairly constant throughout the process. The corresponding change in the binder viscosity was expressed by the T2 shifts to shorter times. This means that the faster NMR probe was capable to minimize the NMR signal losses and therefore it is a suitable tool to investigate asphalt samples. Asphalt binders were extracted from the aged samples and subjected to LF-NMR measurements with the fast NMR probe. It was possible to detect aging trends in the binders, which were in agreement with viscosity trends measured with the Dynamic Shear Rheometer (DSR). The differences in the cumulative amplitude among binders with different aging states mainly depend on the hydrogen nuclei to weight ratio (chemistry) and less on the temperature and measurable limit of the NMR device. This improves the accuracy of the method in the estimation of the binder aging state. In addition, the employed aggregates were separately investigated using LF-NMR.
راعي المشروعThis work was supported by the Qatar National Research Fund (QNRF) through the Post-Doctoral Research Award PDRA 1-120913010 to Texas A&M University at Qatar. All statements are those of the authors and do not represent QNRF.
اللغةen
الناشرElsevier Inc.
الموضوعAging
Asphalt
Low Field Nuclear Magnetic Resonance
Relative Hydrogen Index
Viscosity
العنوانAging evaluation of asphalt samples with Low Field Nuclear Magnetic Resonance
النوعArticle
الصفحات165-175
رقم المجلد128
dc.accessType Abstract Only


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