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Title
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Analysis of 4-mm DSR tests : calibration, sample preparation, and evaluation of repeatability and reproducibility
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Author
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Abstract
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| Rheological characterisation methods are important when it comes to a performance-based selection system for bituminous binders for road applications. Standardised methods exist for the determination of bitumen rheological behaviour based on a dynamic shear rheometer (DSR) at intermediate and high service temperatures and a bending beam rheometer (BBR) at low temperatures. Recently, a dynamic shear rheometer with 4 mm parallel plates (4-mm DSR), has been proposed by Western Research Institute (WRI), as a promising method to determine the rheological behaviour at low temperatures. Clear advantages of the 4-mm DSR are related to the small sample size, especially important for recovered and aged binders, and the ability to work with adequate stresses at very low temperatures. Furthermore, if 4-mm DSR can be used to assess the low temperature behaviour of bitumen, then the performance of a binder in the whole range of service temperatures, could be assessed by just one equipment, a DSR. This paper focuses on the challenges related to 4-mm DSR tests regarding equipment preparation, with a specific attention to the temperature assessment and calibration. Furthermore, a sample preparation method, assuring good adhesion to both plates is proposed and the repeatability and reproducibility of 4-mm DSR tests is evaluated. |
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Language
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English
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Source (journal)
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Road materials and pavement design : an international journal. - Paris, 2000, currens
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Publication
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Abingdon
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Taylor & francis ltd
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2019
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ISSN
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1468-0629
[print]
2164-7402
[online]
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DOI
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10.1080/14680629.2019.1634636
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Volume/pages
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15 p.
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ISI
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000474437400001
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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