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Factors Influencing and Predicting Saw-cut Widths for Reflective Cracking in Composite Pavements

Stephen A. Arhin, Errol Noel, Dwight Wright, Melissa F. Anderson, Regis Stinson

Abstract


One of the common problems that most composite highway pavements experience is reflective cracking. It is caused by cyclical movements of the underlying concrete base with hot-mix-asphalt (HMA) overlay due to climatic and traffic conditions. A saw and seal method, which involves making transverse and longitudinal saw-cuts in the overlaying asphalt (above the concrete joints), and sealing them with a compressible rubberised low modulus material, has been used to mitigate reflective cracking in newly constructed pavements. In this article, a 4½ year field study was undertaken to monitor the widths of the both types of saw-cuts made in the HMA. The widths of the saw-cuts were measured at 22 saw-cut points on a quarterly basis. Statistical tests of the relationship between the saw-cuts and the changes in average daily air temperature, average daily traffic (ADT), and pavement age were conducted. From the results, the maximum daily temperature and ADT had a statistically significant effect on changes in both of saw-cut types.

Keywords


reflective cracking, saw-cut sealant, pavement distress, HMA overlay, air temperature, average daily traffic

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References


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