Title

Interfacial failure behavior of concrete-asphalt Bi-materials

Document Type

Conference Proceeding

Date of Original Version

11-19-2007

Abstract

Bi-material layered systems composed of concrete and asphalt are often used in roadway pavements. A study has been conducted to investigate static and dynamic interfacial failure between these two materials. Construction practices often lead to imperfect bonding resulting in interface cracks, and thus static failure behaviors were interpreted within the framework of fracture mechanics theory. Laboratory material has been used to construct bi-material samples for testing. Samples included central and edge interface crack geometries with loadings applied both normal and inclined to the crack surface. Experimental data indicated that the age of each material played a role in determining interfacial strength, with older material showing higher strength. An idealized analytical solution was used to determine the interfacial stresses and stress intensity factors for the samples used in the static experiments. Results indicated that cracking failure was not completely interfacial, an outcome likely due to the material's heterogeneous particulate nature. Dynamic behaviors were investigated using special lap-joint specimens tested in a Split Hopkinson Pressure Bar (SHPB). Interfacial shear strength was determined at loading rates on the order of MN/s. It was found that dynamic shear strength was about 4 times the corresponding static value.

Publication Title

Proceedings of the SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2007

Volume

3

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