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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
Measuring the Effect of Moisture on Asphalt-Aggregate Bond with the Bitumen Bond Strength Test (11-3766)
Understanding moisture damage mechanisms in asphalt pavements and evaluating the right combination of materials that are resistant to moisture damage is important. Moisture damage can be defined as the loss of strength or stiffness in asphalt mixtures due to a combination of mechanical loading and moisture. A great number of test methods have been developed to evaluate loss of adhesion and cohesion in binders. However, a simple procedure to address moisture damage in the asphalt-aggregate interface is currently not available. The purpose of this paper is to investigate the feasibility of the newly developed Bitumen Bond Strength (BBS) test for moisture damage characterization. An experimental matrix, which included different binders, modifications, and aggregates, to account for different chemical and physical conditions in the aggregate-asphalt interface, was completed. Also, a statistical analysis was performed to verify reproducibility of the BBS test. The results indicate that the bond strength of asphalt-aggregate systems is highly dependent on modification and moisture exposure time. Polymers are found to improve the adhesion between asphalt and aggregate as well as the cohesion within the binder. Moreover, results from this study indicate that the BBS test is repeatable and reproducible. To further validate the effectiveness of this BBS test, a comparison between the BBS test results and the modified Dynamic Shear Rheometer (DSR) strain sweep test was conducted. The comparison shows that the BBS test can rank materials similarly to a more sophisticated and time consuming test.
Moraes, Raquel , University of Wisconsin, Madison
Velasquez, Raul Andres, Barr Engineering Company, Inc.
Bahia, Hussain U., University of Wisconsin, Madison
Transportation Research Board. 500 Fifth St. NW, Washington, D.C. 20001
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