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In addition, it has been observed that the presence of the chip seal can exacerbate distresses, as <br />illustrated from a survey of Blue Heron Road in Woodbury, MN, in Figure 14. In other words, a road with <br />sealed and unsealed sections may experience more block cracking in areas with the chip seal (Figure <br />14b) than in areas without the chip seal (Figure 14a). <br />(a) <br />(b) <br />Figure 14. Possible contribution of chip seal to advanced cracking in (a) unsealed and (b) chip -sealed pavement <br />on Blue Heron Road in Woodbury, MN <br />These observations raise questions about how a chip seal may create conditions that (A) contribute to <br />the incidence of stripping and (B) exacerbate other distress in the asphalt pavement. While the project <br />research was extensive, the scope did not include the complex phenomena that govern this problem. It <br />is possible that the chip seal may "trap" moisture/vapor in the asphalt layer immediately beneath the <br />seal. Freeze -thaw cycling may break down the asphalt at an accelerated rate due to the presence of <br />trapped moisture. This is an issue for future research. <br />36 <br />