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Effects of Different Creep and Recovery Times on the Rheological Properties of Modified Asphalt Binders

Grant number: 13/20483-6
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2014
Effective date (End): June 30, 2016
Field of knowledge:Engineering - Civil Engineering - Transportation Infrastructure
Principal Investigator:Adalberto Leandro Faxina
Grantee:Matheus David Inocente Domingos
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated scholarship(s):14/17584-8 - Repeated creep tests with Hot-Mix asphalt (HMA) mixtures: a case study involving modified asphalt binders with similar high-temperature performance grades, BE.EP.DR


The multiple stress creep and recovery (MSCR) test is a result of refinements in the repeated creep and recovery test by the United States Federal Highway Administration (FHWA) with the main objectives of (a) analyzing and controlling the stress dependence of asphalt binders; (b) quantifying the magnitude of the elastic reponse of the asphalt binder and its rutting potential; and (c) determining the adequate traffic level for each asphalt binder at the high pavement temperature. The standard test protocol (ASTM D7405, AASHTO TP70) utilizes a dynamic shear rheometer (DSR) to apply subsequent loading-unloading cycles (10 or 20 cycles, depending on the standard and the stress level) on an asphalt binder sample with a diameter of 25 mm and a gap height of 1 mm, such that each cycle includes a creep time of 1 s and a recovery time of 9 s.Although the MSCR test constitutes a substantial improvement over the dynamic oscillatory shear test and the determination of the Superpave® binder rutting parameter G*/sin´, the standard procedure has major limitations. One of these limitations is the recovery time of 9 s, which may not be long enough to fully capture the recoverable strain of asphalt binders. Another problem is the proportion 1:9 for the creep and recovery times, since research studies with asphalt mixtures showed that the recovery time must be from 20 to 30 times longer than the creep time to obtain a complete characterization of the rheological behavior of the asphalt binder.This research project is intended to contribute to the industry and the university sectors in the following aspects: (a) to present an in-depth study about the creep-recovery behavior of asphalt binders modified with different types of additives and the same high-temperature performance grade (PG 76-xx); (b) to clarify some issues concerning the effects of the delayed elasticity on the rheological properties of short-term aged asphalt binders; and (c) to determine, as a function of a predefined creep time, the recovery time at which the delayed elasticity of the asphalt binders is fully recovered and does not have any more influence on the rheological properties of the materials.

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
INOCENTE DOMINGOS, MATHEUS DAVID; FAXINA, ADALBERTO LEANDRO; BERNUCCI, LIEDI LEGI BARIANI. Modelling and permanent deformation analysis of low-density polyethylene (PE)-modified bitumens and asphalts. Road Materials and Pavement Design, FEB 2020. Web of Science Citations: 0.
INOCENTE DOMINGOS, MATHEUS DAVID; FAXINA, ADALBERTO LEANDRO. Alternative interpretation of the adequate traffic levels of modified bitumens on Superpave (R): a case study with crumb rubber and polyphosphoric acid (PPA). Road Materials and Pavement Design, v. 20, n. 2 JUN 2019. Web of Science Citations: 0.
INOCENTE DOMINGOS, MATHEUS DAVID; FAXINA, ADALBERTO LEANDRO; BARIANI BERNUCCI, LIEDI LEGI. Characterization of the rutting potential of modified asphalt binders and its correlation with the mixture's rut resistance. CONSTRUCTION AND BUILDING MATERIALS, v. 144, p. 207-213, JUL 30 2017. Web of Science Citations: 7.
DOMINGOS, M. D. I.; FAXINA, A. L. Susceptibility of Asphalt Binders to Rutting: Literature Review. JOURNAL OF MATERIALS IN CIVIL ENGINEERING, v. 28, n. 2 FEB 2016. Web of Science Citations: 10.

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