Abstract
This study presents the results of a series of creep-recovery experiments that were conducted on asphalt binders modified with polyphosphoric acid (AC+PPA) and Elvaloy® terpolymer combined with polyphosphoric acid (AC+Elvaloy+PPA) at the temperatures of 52, 58, 64, 70 and 76 °C. The multiple stress creep and recovery (MSCR) test was used to determine the percent recoveries (R), the non-recoverable compliances (J nr) and the percent differences in non-recoverable compliances (J nr, diff) of these modified asphalt binders and the ones of the 50/70-penetration grade base material. The base material is graded as PG 64-xx and the formulations with PPA and Elvaloy+PPA are graded as PG 76-xx. Two pairs of loading–unloading times were used in the MSCR tests, namely, 1/9 s and 2/18 s. The AC+Elvaloy+PPA shows not only the highest R values and the lowest J nr values, but also the lowest sensitivity to a sudden increase in the stress level inside the asphalt mixture. Although the results are not as promising as the ones found in the AC+Elvaloy+PPA, the AC+PPA may be taken as an alternative to replace the unmodified asphalt binder when the loading and/or the climate conditions are more severe.
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Abbreviations
- AASHTO:
-
American Association of state Highway and Transportation Officials
- AC:
-
Asphalt cement or asphalt binder
- ASTM:
-
American Society for Testing and Materials
- DSR:
-
Dynamic shear rheometer
- FHWA:
-
United States Federal Highway Administration
- MSCR:
-
Multiple stress creep and recovery
- PG:
-
Performance grade
- PPA:
-
Polyphosphoric acid
- RCRT:
-
Repeated creep and recovery test
- RTFO:
-
Rolling thin-film oven
- SARA:
-
Saturates, aromatics, resins and asphaltenes
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Acknowledgments
The first author acknowledges the Brazilian Federal Research Agency (CAPES) for providing a scholarship. The second author gratefully thanks the Research Agency of the Sao Paulo State (FAPESP) for providing financial funds (FAPESP process number 2006/55835-6).
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Inocente Domingos, M.D., Faxina, A.L. Rheological analysis of asphalt binders modified with Elvaloy® terpolymer and polyphosphoric acid on the multiple stress creep and recovery test. Mater Struct 48, 1405–1416 (2015). https://doi.org/10.1617/s11527-013-0242-y
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DOI: https://doi.org/10.1617/s11527-013-0242-y