Slippage Cracking

Description

Crescent or half-moon shaped cracks generally having two ends pointed into the direction of traffic.

Figure 1: Slippage cracking at a bus stop.

Figure 2: Slippage cracks at an intersection.

Problem

Allows moisture infiltration, roughness

Possible Causes

Braking or turning wheels cause the pavement surface to slide and deform. The resulting sliding and deformation is caused by a low-strength surface mix or poor bonding between the surface HMA layer and the next underlying layer in the pavement structure.

Repair

Removal and replacement of affected area.