With the development and use of the asphalt pavement more and more often, then the pavement surface will occur to many different types of cracks. Longitudinal cracks are parallel to the pavement's centerline or lay-down direction. They may be caused by:
Shrinkage of the asphalt surface due to low temperatures or hardening of the asphalt and/or daily temperature changes;
Reflective cracking caused by cracking beneath the asphalt surface course;
Cracks may appear beneath the earth and pavement when earth-like material such as clay, peat, or the sub base starts to deteriorate from the bottom up;
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