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TRB 90th Annual Meeting (January 23-27, 2011)
Characterization of Moisture Susceptibility in Hot and Warm Asphalt Mixtures
Jan 25 2011 2:30PM- 5:00PM
Marriott, Salon 2
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.
Ban, Hoki , University of Nebraska, Lincoln
Kim, Yong-Rak , Kyung Hee University, South Korea
Pinto, Ingryd , University of Nebraska, Lincoln
Transportation Research Board. 500 Fifth St. NW, Washington, D.C. 20001
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