Correlation Between Rheological Rutting Tests on Bitumen and Asphalt Mix Flow Number

Autor: Loretta Venturini, Muhammad Aakif Ishaq, Filippo Giustozzi
Rok vydání: 2021
Předmět:
Zdroj: International Journal of Pavement Research and Technology. 15:1297-1316
ISSN: 1997-1400
1996-6814
Popis: Selecting an asphalt binder that has the potential of withstanding permanent deformation in the field is a challenging task; in particular, relating the binder’s rutting resistance to the corresponding behaviour of the asphalt mixture can prove difficult. The main objective of this paper is to evaluate the correlation between rutting susceptibility of bitumen with that of the asphalt mixtures prepared using the same bitumen. The testing methods used in this study include laboratory experiments on bitumen and asphalt used by several agencies in their specifications, such as the percentage of recovery (%R) and non-recoverable compliance (Jnr) through multiple stress creep and recovery (MSCR) test, Superpave rutting parameter G*/sinδ through frequency sweep tests and the flow number of asphalt mixtures through uniaxial repeated load tests. Statistical comparisons across bitumen and asphalt test outcomes were made by analysing the correlations generated by several types of bitumen tested, i.e. both polymer-modified using various polymers (elastomers and plastomers) and standard unmodified bitumen. The G*/sinδ parameter at various frequency (0.1, 0.5, 1, 1.59, 5 and 10 Hz) and testing temperature (40 and 60 °C) and Jnr at various stress levels (0.1, 3.2, 6.4 kPa) and temperature (60 ℃) were correlated with flow number at 50, 55 and 60 ℃. The correlation was also analysed by grouping some of the materials tested to verify the statistical fit between tests on bitumen and on asphalt mixes. The results show how Jnr is a better indicator of rutting performance for asphalt materials than G*/sinδ; however, G*/sinδ provides a good correlation with the permanent deformation of asphalt groups prepared using similar binders (i.e. belonging to the same family of polymers).
Databáze: OpenAIRE
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