10- Block and Transverse Cracking ----------------------------------------- Description: Block cracks are interconnected cracks which divide the pavement into large rectangular pieces or blocks. Block size may range from 1 m by 1 m (3 ft. by 3 ft.) upwards to 3 m by 3 m (10 ft. by 10 ft.). Transverse cracking is cracks at approximately right angles to the pavement centerline. ------------------------------------------- Possible Causes: -------------------- 1- thermal shrinkage of the asphalt binder. 2- Binder age hardening ------------------------------------------- Severity Level: ------------------ Low: Average crack width less than 6 mm (1/4 inch) with no raveling or distortion along crack edges. Medium: Average crack opened or raveled to a width between 6 mm to 25 mm (1/4 to 1 inch) along at least half its length. High: Average crack opened or raveled to a width greater than 25 mm (1 inch) along at least half its length. ------------------------------------------- Extent Level: ---------------- Occasional:Less than 20% of the section length is affected by this distress. Frequent: Between 20% and 50% of this section length is affected by this distress. Extensive: More than 50% of this section length is affected by this distress.
Posted on: Sat, 27 Sep 2014 20:44:12 +0000
Trending Topics
© 2015