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Asphalt Binder and Mixture Characterization

Session: Meet the Author - Poster Session PS-2

1374452 - Using fundamental mechanics to guide the development of a simple cracking indicator test for asphalt binders

Thursday, June 15, 2023

3:00 PM – 4:30 PM CST

Room: Governor's Grand Ballroom
Salon ABC

TRACK: Poster Presentation

Primary Author(s)

Kiran Mohanraj, P.E.

Project Manager
The Transtec Group
Austin, TX, United States

Presenter(s)

Kiran Mohanraj, P.E.

Project Manager
The Transtec Group
Austin, TX, United States

Co-Author(s)

Satyavati Komaragiri, PhD

Postdoctoral Fellow
The University of Texas at Austin, United States
Miomir Miljković, n/a

Assistant Professor
University of Niš
Niš, Serbia
Darren Hazlett, n/a

Research Associate
The University of Texas at Austin, United States
Amit Bhasin, Ph.D., P.E.

Professor
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX, USA
Austin, Texas, United States

The tensile properties of asphalt binders play an important role in the cracking performance of flexible pavements. Several studies have been performed to evaluate tensile strength of asphalt binders in thin films that represent a stress state experienced by asphalt binders in hot mix asphalt mixtures (HMA) in field. Some such studies have found formation of cavities at the failure plane as the key mechanism of crack propagation in asphalt binders. However, relationship of cavitation with other asphalt binder mechanical, chemical and rheological properties have not been studied in detail. This study examines the behavior of thin films of asphalt binders when tested in tension and the formation of cavities in the bulk are observed under near infrared (NIR) light using a digital microscope. Asphalt binders used in the study varied by type, crude source, modification types and levels, and aging. The images captured during the test were used to determine the area and shape of the cavities using image processing. The results were further used in studying the formation of cavities with respect to the stress-strain curve and the general shape of the cavities formed. Lastly, the calculated area of the cavities were used in comparing the engineering stress to true stress.

Learning Objectives:

Attendees can expect to learn the following from this session:

understand tensile properties and behavior of asphalt binders
understand failure mechanism of cracking in asphalt pavements
conduct testing of thin film of asphalt binders