Crack Development in Linear Tracking Test Pavements from Visual Survey to Pixel Analysis

Abstract

Cracking is one of the most common and important types of pavement distress. This includes structural cracking, originating at the bottom of the bound layers and growing toward the surface, and surface-originated cracking. Descriptions of cracking and its development, both for research and for pavement management and maintenance, are limited to some global nonnumerical characterization, which is not sufficient for detailed computerized analyses. The crack pattern of the linear tracking device (LINTRACK) test Lane I was originally recorded nonnumerically on photographs and transparent plastic sheets. These data were digitized to enable scientific analysis and interpretation. Crack length, crack direction, growth speed, and percentage of cracked area were calculated from the digital data.

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