Study of Asphalt Binders Fatigue with a New Dynamic Shear Rheometer Geometry

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Abstract

With the effort to predict precisely the lifetime of asphalt binders and subsequently optimize their utilization in a more economical way, the objective of this study was to introduce a new methodology to improve the fatigue characterization of asphalt binders through a new dynamic shear rheometer (DSR) sample testing geometry. Initially, numerical analyses were performed to study the geometry-related issues of standard DSR sample on time sweep tests and assisted on the effort to increase the understanding of DSR damage phenomena of asphalt samples. On the basis of these numerical analyses, a new testing geometry, the parallel hollow plate, was developed and its test results compared with the standard sample testing geometry. A single type of asphalt binder was assessed using amplitude sweep tests. The obtained results demonstrated a significant difference between the fatigue of the two sets of DSR sample geometries. On the basis of these, time sweep tests were conducted for the same sample geometries and the results demonstrated that the new testing geometry yields material response consistency under different loading conditions. The lifetime prediction of the standard parallel plates showed a significant difference with the newly developed DSR sample testing geometry by overestimating the total number of cycles until asphalt binder failure. The new testing geometry allowed the insolation of the damage area of asphalt binder by localizing the shear stresses in the samples’ periphery.
Original languageEnglish
Title of host publicationTransportation Research Board 97th Annual Meeting
Subtitle of host publication2018-1-7 to 2018-1-11, Washington DC, United States
PublisherTransportation Research Board (TRB)
Number of pages21
Publication statusE-pub ahead of print - 2018
EventTRB 2018: 97th Annual Meeting of the Transportation Research Board - Walter E. Washington Convention Center, Washington D.C., United States
Duration: 7 Jan 201811 Jan 2018
Conference number: 97

Publication series

NameTransportation Research Record
PublisherUS National Research Council
ISSN (Print)0361-1981

Conference

ConferenceTRB 2018: 97th Annual Meeting of the Transportation Research Board
Abbreviated titleTRB 2018
CountryUnited States
CityWashington D.C.
Period7/01/1811/01/18

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