Determining Creep Compliance and Strength of Asphalt Mixtures at Low Temperatures

Friday, February 20, 2015 - 10:00am

About the Event

This presentation highlighted a study that examined the feasibility of obtaining asphalt mixture creep compliance and strength at low temperatures from tests performed on small mixture beams. An overview of both experimental work and theoretical considerations regarding representative volume element and size effects was provided.

The experimental component of the study consisted of three-point bending creep and strength tests performed on beams of different sizes. The researchers obtained detailed information on the internal structure of asphalt concrete from digital imaging, and they estimated spatial correlation functions of specimens of different sizes. The team analyzed creep response using micromechanics and analogical models and then proposed the use of a back-calculation method to obtain component asphalt binder creep compliance from asphalt mixture experimental data. Strength response was analyzed using finite weakest link model. The presentation closed with a discussion of how this approach could be implemented for routine laboratory testing of asphalt mixtures.

Speaker(s)

Mihai MarasteanuMihai Marasteanu is a professor of civil, environmental, and geo- engineering at the University of Minnesota. His major research interests involve applications of fundamental theories (viscoelasticity, rheology, plasticity, fracture mechanics, continuum damage mechanics, micromechanics) to bituminous materials characterization, modeling, and experimental testing. His current research activities include the characterization of low-temperature behavior of asphalt binders and mixtures and the characterization of asphalt emulsions in relationship to their field performance.