Abstract
ABSTRACT In this paper the application of X-ray Computerised Tomography (CT) as a tool for analysis of cracks in asphalt layers is described. CT is a non-destructive method typically used in the field of medicine and metallurgy. The method makes it possible to display the face of an internal surface at any depth of a sample, and has previously been used to study air void distribution and material displacement in asphalt pavements. In this study, asphalt cylinders from a typical Swedish road have been cored. It was found that about 3/4 of the cores contained cracks, which appeared at the surface but not at the bottom, indicating an initiation of the crack at the road surface (top-down cracks). No correlation was found between the type of crack and the position on the road with respect to the wheel path. The 3D crack pattern was also studied and the method proved to be useful for detecting internal cracks as narrow as 0.2 mm. Even if the method seems to be promising, considerable amount of further research is needed before a more general conclusion can be drawn about the usefulness of the method in road engineering. Examples in this connection are development of advanced technique, which makes it possible to detect more narrow cracks, and studies showing if cracks visible at the surface may propagate further down in the asphalt layers.
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