When looking at asphalt maintenance it can be divided into four areas. The primary cause of asphalt failing is the penetration of water into the asphalt base. Over time, it will become brittle and dry with the aggregate beginning to wear away and cause cracks that will let water penetrate into the base of the pavement. When the water seeps into the crack it causes the base material to move and settle. This leads to the surface cracking in a pattern that is grid-like When the payment has reached this stage there are only two options, which replace the old asphalt or patch repair it.
Patch repair
It deals with areas that are isolated. Using a backhoe and saw-cutting the pavement is removed. They can also use a grinding machine. Once the old asphalt is removed, it is replaced with new asphalt. The removal method determines the amount that is removed. The removal depth should be equal to one point five times the original thickness of the asphalt. You may also have to replace the base-rock to match the adjacent areas to allow for base support that is uniform. The amount of removal should be extended twelve inches past the area that failed.
Asphalt overlay
This asphalt maintenance is affordable and provides a new wearing surface. When dealing with asphalt overlay there is a certain factor you need to be aware of, which include:
• Overlay thickness-it should be a maximum of two point five inches with a minimum of one point five inches
• Smooth transitions-when you are considering where to grind the existing pavement down remember not to grind down the overlay section to match the existing structure. If you do this could weaken the strength of the overlay. They will grind the existing payment down to where they meet flush together to prevent this.
Inlay and pulverize in place
Both of these areas of asphalt maintenance are accomplished using a milling machine. During the process of inlay, it removes a depth of the existing asphalt, which is many times a previous overlay. This will let the contractors put the asphalt back to the pre-inlay elevation. The method of pulverize-in-place will reduce all of the asphalt to particles that are base-rock size.
Seal coating
This is an important part of extending the life of the asphalt and it should not be overlooked. Seal coating is a mixture of mineral fibers, emulsified asphalt, and water along with other admixtures. This will seal the top layer of asphalt to prevent water from penetrating the pavement surface and protecting the top layer from wear from sun exposure and oxidation. It is what gives the asphalt its even black surface.
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