Page 7 - Pavement Protection System Brochure

Pavement Surface Defects

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Transverse Cracks - at approximately right angles to the centerline is a transverse
crack. They are often regularly spaced. The cause is movement due to
temperature changes and hardening of the asphalt with aging. Transverse
cracks will initially be widely spaced (over 50 feet or 15 meters). Additional
cracking will occur with aging until they are closely spaced (within several feet or
a meter). These usually begin as hairline or very narrow cracks, with aging they
widen. If not properly sealed and maintained, secondary or multiple cracks
develop parallel to the initial crack. The crack edges can further deteriorate by
raveling and eroding the adjacent pavement. Prevent water intrusion and
damage by sealing cracks, which are more than 1/4" (6mm) wide.

Reflection cracks - cracks in overlays reflect the crack pattern in the pavement
underneath. Difficult to prevent and correct.
SOLUTION: Thick Overlay with EBS mixed with soil, reconstruction of wearing
course layer usually required with a new EBS Seal on top.

Slippage Cracks - A crescent of rounded cracks in the direction of traffic, caused
by slippage between the overlay and underlying pavement, Slippage is most
likely to occur at intersections where traffic is stopping and starting.
SOLUTION: Repair by removing the top surface, ensure compaction, and re-
surfacing using EBS overlay sealant.

Longitudinal Cracking - Cracks running in the direction of traffic, these centerline or
lane cracks are caused by inadequate bonding during construction and reflect
cracks in underlying pavement. Longitudinal cracks in the wheel path indicate
fatigue from heavy vehicle loads; cracks within one foot (30cm) of the edge are
caused by insufficient shoulder support, poor drainage, or frost. Cracks start as
hairline and widen and erode with age. Without crack filling they will “ravel”,
develop multiple cracks, and become wide enough to require filling.
SOLUTION: Filling and sealing cracks with EBS will reduce moisture penetration and
prevent further subgrade weakening. Multiple cracks in the wheel path indicate a
need for strengthening with an overlay or reconstruction followed by an EBS surface
seal.

S O I L S O L U T I O N SO I L S O L U T I O N SO I L S O L U T I O N S
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