Quantifying The Mode I Energy Release Rate for Interface Fracture of Portland Cement Concrete Bonded to Asphalt

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Title: Quantifying The Mode I Energy Release Rate for Interface Fracture of Portland Cement Concrete Bonded to Asphalt

Author(s): Feng Mu, Julie M. Vandenbossche, and Donald J. Janssen

Publication: Special Publication

Volume: 300

Issue:

Appears on pages(s): 1-16

Keywords: Interface Bond, Interface fracture, Mode I energy release rate, Whitetopping, Wedge splitting test, Milling

Date: 3/11/2015

Abstract:
The performance of ultra-thin and thin concrete overlays on existing asphalt pavements, commonly referred to as whitetopping, requires the bond between the two layers to be maintained throughout the service life. Tensile stresses generated at the interface and adjacent to the joints due to slab curvature and the continuous nature of the underlying HMA contribute to the localized debonding of these two layers. A wedge splitting test was employed in this study to quantify the mode I loading induced fracture along the Portland cement concrete/hot mix asphalt interface of specimens designed specifically for this test. An analytical model is developed to characterize the response of the specimen under this loading condition. The model is used to assist in identifying the initiation as well as the growth of the interfacial crack, and for establishing the interfacial energy release rate. Using this model, the initiation as well as the growth of the interfacial crack is predicted for specimens with different surface textures at the interface.