Page 6 - EBS Pavement Protection System Brochure

Whether to apply a full Pavement Protection Overlay Sealant
or if a Crack Repair System is needed

Pavement selection is important in determining the success or
failure of a protection sealant or a repair crack sealing project. For
this purpose the PASER Evaluation Method was developed. The Paser
method defines defects; evaluates and rates pavement surfaces; and
provides a remedy which meets US and international road construction
specifications. The following classifications and remedies are excerpts
from Paser Asphalt Road Manual – Pavement Surface Evaluation and
Rating 2002.

There are a number of defects that occur in pavement surfaces.
These include:

Surface defects
Raveling - Progressive loss of pavement material
from surface downward caused by stripping of the
bituminous film from the aggregate, asphalt hardening
due to ageing and poor compaction. Slight raveling has
loss of fines. Severe raveling has loss of coarse aggregate.
Solution: Thin overlay seal coat with EBS

Flushing – Excess asphalt on the surface caused by poor initial asphalt
mix design or by paving over flushed surface.
Solution: Overlaying a new asphalt layer with EBS Surface Sealant.

Polishing - A smooth slippery surface caused by traffic wearing off sharp edges of aggregate.
Solution: Repair with an EBS Seal coat overlay with a sand seal if required.

Surface deformation

Rutting - Displacement of material creating channels in wheel paths caused by traffic
compaction or displacement of unsuitable material.
Solution: Minor rutting repair with overlays using EBS. For severe rutting, mill the old
surface, reconstruct the bed and then re-surface and seal with EBS.

Distortion - Shoving or rippling of surface material in displaced crossways, which effect the
direction of traffic. It can develop in to wash boarding when the asphalt mixture is unstable
because of poor quality aggregate or improper mix design.
Solution: By milling smooth with EBS and overlaying with a stable asphalt mix and EBS
Surface Seal.

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