Asphalt improvement
Some of the important factors that
can cause roads asphalt pavement (surface) damage are mentioned below:
-
The
quality and the kind of the material of that area’s ground and the subgrade
-
The
weight and the amount of the through traffic on the road surface (the weight
and the amount of heavy vehicles against the amount of light vehicles is very
important)
-
The
climate condition in which the road is located, the number of cold days, the
amount of the environment heat, and the most important one, the changes in the
temperature in different seasons and during the day.
-
Whether
the leadership principles and the required controls (like bitumen quality, the
used materials in asphalt, the characteristics of the base layer and sub-base
layer, the kind of the grading materials, and the density of the materials)
have been done by the contractor and the control system during the building
period is very important.
-
The
done actions for in-time maintenance and the repairs of the asphalt surface are
important for increasing the asphalt service life.
-
The
regional topography especially the amount of road slope is also very important
in the asphalt surface service life.
-
The
crossing of the vehicles that have snow tires or snow chains in the cold
seasons and the cold areas is effective in asphalt damaging.
The
asphalt surface damage is divided into two categories that contain the superficial damages and fundamental damages.
Superficial
damages only contain roads asphalt surfaces issues like bleeding, raveling,
chemical reactions in the asphalt bitumen, and inadequacy of the concerned
stone material. But the fundamental damages contain the lower layers of asphalt
like the base and the sub-base layers and also the lower layers.
Using
the asphalt improvement method depends on the damage type so recognizing the
type of the asphalt damage is important in repairing and improvement of it.
Repairing
and improvement are only considered and used in superficial damages. However,
in the fundamental damages, not only the asphalt surface should be repaired,
but also the lower layers should be repaired as well.
Technically,
the road surface repairment is done for two reasons:
1.
To
increase the bearing capacity
2.
To
fix the roughnesses, cracks, and transformations of the asphalt surface.
The damage type can contain:
-
Reflection
cracking
-
Shear
-
A
cracking between two asphalt lanes
-
Shrinkage
cracking
-
Shear
cracking
-
Alligator
cracking
-
Asphalt
edge cracking
-
Waves
-
Hollows
and wheel traces
-
Local
land subsidence
-
Inflation
-
Asphalt
bleeding and bitumen leakage
-
Asphalt
raveling (when the asphalt particles jump out from their own place)
-
Asphalt
pavement polishing
After diagnosing each one of those,
their own cure is needed, and repairing each one has its own method which is
out of the question here.