Page 27 - UNIT 6 - HIGHWAY MAINTENANCE

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Crescent-shaped cracks

 Crescent – shaped cracks are half moon in shape commonly associated with shoving
usually occur at braking, turning and accelerating area.

 It is mainly associated with the bituminous layer only.
 Other terms : Parabolic , slippage @ shear cracks.

 Causes
 Lack of a good bond between surface layer and the course beneath due to dust,
oil, dirt, rubber, water and other non-adhesive material
 Tack coat has not been used
 Mixture has a high sand content
 Vehicular turning or stopping movements in pavements with a low-strength surface
mix

 Cures
 Crack Filling/Sealing

 Full-Depth Reclamation

Prepared by : SITI ZURAIFA BINTI MD SAH, zuraifa@pmu.edu.my