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

• Grant number: 13/20483-6
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: April 01, 2014
• End date: June 30, 2016
• Field of knowledge: Engineering - Civil Engineering - Transportation Infrastructure
• Principal Investigator: Adalberto Leandro Faxina
• Grantee: Matheus David Inocente Domingos
• Host 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

Abstract

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

(6)

(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)

DOMINGOS, M. D. I.; FAXINA, A. L.. Literature Review of the Multiple Stress Creep and Recovery, Performance-Related Test. JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS, v. 147, n. 1, MAR 1 2021. (13/20483-6)

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. (14/17584-8, 13/20483-6)

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, v. 22, n. 8, p. 1860-1880, AUG 3 2021. (13/20483-6, 14/17584-8)

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, p. 15-pg., 2019-06-20. (13/20483-6)

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. (13/20483-6)

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. (13/20483-6)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

DOMINGOS, Matheus David Inocente. The importance of the creep and recovery times on the rheological behavior and the susceptibility of modified asphalt binders to rutting. 2017. Doctoral Thesis - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) São Carlos.