Crack sealing and filling are cost-effective pavement preservation techniques that can improve pavement performance, increase remaining service life, and provide potential contracting opportunities for disadvantaged business enterprises. However, the Colorado Department of Transportation's (CDOT's) crack sealing policy manual hasn't been updated since it was developed in 1994 and is not applicable to the current state of the practice. This research will recommend a policy for application and use of crack sealing and filling; develop best practices, design guidelines, and specifications; and identify appropriate quality control/quality assurance (QC/QA) procedures.
To accurately estimate the cost for crack sealing on airport runway shoulders, an automatic approach using 3D line laser imaging technology, automatic crack detection, and width measurement algorithms is proposed. Based on their widths, cracks can be categorized in terms of the routing depths. Then, accurate cost estimation can be made according to the total length in each crack category using different routing depths.
Other than the cost estimation, the detected crack maps and the crack classification information can also be used to guide construction operations and provide a means for agencies' quality checking. Using the proposed method, a case study has been performed on a 30.5-m (100-ft) runway shoulder at Hartsfield-Jackson Atlanta International Airport. The results show that the proposed method is very promising for providing an automatic approach that cost-effectively and reliably generates categorized crack maps with different crack sealing methods and accurately estimates crack sealing cost.
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