9- Wheel Track Cracking: ------------------------------ Description: Cracks located within or near the wheel tracks. For evaluation purposes each wheel track shall be considered 1 m (3 feet) in width. Wheel track cracking usually starts as intermittent, single longitudinal cracks progressing to multiple longitudinal cracking, and eventually interconnected or alligator cracking. ------------------------------------------- Possible Causes: -------------------- Wheel track cracking usually results from fatigue failure of the asphaltic layer. ------------------------------------------- Severity Level: ------------------ Low: Single or intermittent multiple cracking with average crack width less than 6 mm (1/4 inch). Medium: Single or multiple cracking (may also include regions of intermittent alligator cracking) with average crack width greater than 6 mm (1/4 inch) with little spalling or loose pieces. High: Multiple cracking with extensive alligator cracking. Raveling is fairly common with average crack width greater than 6 mm (1/4 inch), and some alligator blocks are easily removed. ------------------------------------------- Extent Level: ---------------- Occasional: Less than 20%. Frequent: Between 20% and 50%. Extensive: More than 50%.
Posted on: Sat, 27 Sep 2014 20:43:07 +0000
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