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Repeated creep tests with Hot-Mix asphalt (HMA) mixtures: a case study involving modified asphalt binders with similar high-temperature performance grades

Grant number: 14/17584-8
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): October 01, 2014
Effective date (End): December 31, 2014
Field of knowledge:Engineering - Civil Engineering - Transportation Infrastructure
Principal researcher:Adalberto Leandro Faxina
Grantee:Matheus David Inocente Domingos
Supervisor abroad: Hussain U. Bahia
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Research place: University of Wisconsin-Madison (UW-Madison), United States  
Associated to the scholarship:13/20483-6 - Effects of Different Creep and Recovery Times on the Rheological Properties of Modified Asphalt Binders, BP.DR


Since the development of the multiple stress creep and recovery (MSCR) test by the US Federal Highway Administration, research studies have been conducted to display and examine the rheological properties of asphalt binders at high in-service temperatures and test conditions other than those established by the American standards. To further explore the potential of the MSCR test as a high-temperature binder test and verify its capability of predicting the rutting resistance of the mixture in the laboratory, this research study mainly aimed at analyzing and describing the creep-recovery behavior of dense-graded hot-mix asphalt (HMA) mixture samples prepared with several modified asphalt binders. One 50/70-penetration grade base material (PG 64-xx) from the Lubnor-Petrobras refinery, crumb rubber, polyphosphoric acid (PPA) and five types of polymers (Elvaloy®, SBS, SBR, EVA and PE) were used to prepare 12 formulations with the same high-temperature performance grade (PG 76-xx), six of which have just one modifier (AC+modifier) and the other six have one modifier and PPA (AC+modifier+PPA). It is expected that the great variety of materials, together with the promising results obtained in the literature regarding the repeated creep tests with binders and the correlations between the results of asphalt binders and asphalt mixtures, will lead to (1) a more precise estimate of the contribution of the modifier type (s) on the susceptibility of the mixture to rutting; (2) an indication of the mixtures with better and worse performances; and (3) an accurate identification of the similarities and differences among these varied dynamic creep responses. (AU)

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Scientific publications
(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; 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.

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