Paper Details

TRB 90th Annual Meeting (January 23-27, 2011)

Event Number:	546
Event Title:	Characterization of Moisture Susceptibility in Hot and Warm Asphalt Mixtures
Event Date:	Jan 25 2011 2:30PM- 5:00PM
Event Location:	Marriott, Salon 2
Event Description:
Event Agenda:

Integrated Experimental-Numerical Approach for Estimating Material-Specific Moisture Damage Characteristics of Binder-Aggregate Interface (11-1240)

This paper presents an integrated experimental-numerical approach to estimate the material-specific moisture damage characteristics of binder-aggregate interfaces. To this end, a pull-off test using a Pneumatic Adhesion Tensile Testing Instrument (PATTI) is conducted to determine the bond strength between asphalt film and the aggregate surface to which different types of anti-stripping additives are applied with different levels of moisture conditioning. A sequentially coupled moisture diffusion–mechanical analysis is implemented using a finite element technique to model the bond strength and progressive interfacial degradation due to moisture diffusion followed by mechanical pulling pressure. To simulate the adhesive fracture at the binder-aggregate interface, a cohesive zone model is incorporated into the approach. The integrated approach presented herein results in a degradation function that characterizes interfacial damage due to moisture uptake with two model parameters representing the remaining bond strength and the degradation trend. With the two model parameters, moisture damage mechanisms and damage resistance potential, both of which are material specific, can be estimated.

Authors
     Ban, Hoki , University of Nebraska, Lincoln
     Kim, Yong-Rak , Kyung Hee University, South Korea
     Pinto, Ingryd , University of Nebraska, Lincoln