Quantitative relationship of fundamental rheological properties of bitumen with the empirical Ring and Ball softening point
| Autor: | Jiqing Zhu, Michael Langfjell, Xiaohu Lu, Anders Gudmarsson |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
softening point
Ring (mathematics) Infrastrukturteknik Materials science Softening point Rheometer High Energy Physics::Phenomenology rheological property dynamic shear rheometer Infrastructure Engineering Viscoelasticity Condensed Matter::Soft Condensed Matter Shear modulus Rheology Bitumen Dynamic shear rheometer Ball (bearing) temperature sweep Composite material Civil and Structural Engineering |
| Zdroj: | Road Materials and Pavement Design. 22:S345-S364 |
| ISSN: | 2164-7402 1468-0629 |
| DOI: | 10.1080/14680629.2021.1900898 |
| Popis: | This paper employs the linear viscoelastic parameter G '/tan delta as the quantitative criterion for identifying a common relationship with the Ring and Ball softening point of both unmodified and polymer-modified bitumen (PMB). Temperature sweep was conducted at 10 rad/s with dynamic shear rheometer to determine the complex shear modulus G* and phase angle delta of bitumen. The parameter G '/tan delta could be obtained. Logarithmic interpolation was applied for G '/tan delta to determine the equivalent softening temperature T-s (_G '/tan delta ) at which G '/tan delta equals the proposed criterion values. With this method, a good agreement could be reached between T-s (_G '/tan delta ) and the softening point for both unmodified bitumen and PMB. While keeping high accuracy for unmodified bitumen, the accuracy of T-s (_G '/tan delta ) as an estimation of the softening point of PMB was largely improved when compared to the iso-modulus approach. The reliability of this quantitative relationship is preliminarily verified and its implementation is discussed in the Black space. |
| Databáze: | OpenAIRE |
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