When it comes to asphalt maintenance, there are four important aspects to consider. Water penetrating into the asphalt base is the main cause why asphalt begins to fail. In the course of time, the asphalt will become brittle and dry with the aggregate starting to wear away and this causes cracks that will let water penetrate into the base of the pavement. The base material will then move and settle when water seeps into the cracks. There will be a grid-like cracking on the surface when the base materials move and settle. Soon the pavement will crack and when this happen you should either replace the old asphalt or patch repair it.
When doing patch repair, you only consider isolated areas of the pavement. The pavement is removed used a backhoe and saw-cutting. Grinding machines can also be used for this purpose. New asphalt is put to replace the old asphalt that was removed. The amount that is removed is determined by the removal method. The depth of removal should be one and a half times the original thickness of the asphalt. The base rock may also have to be replaced so that it matches the adjacent areas to allow for a uniform base support. Your should remove asphalt up to 12 inches past the area that has failed.
Asphalt overlay maintenance is affordable and provides a new wearing surface. Before dealing with asphalt overlay, there are certain factors that you need to be aware of. The overlay should have a maximum thickness of 2.5 inches and a minimum of 1.5 inches. If you are going to grind down the existing pavement, do not do it on the overlay section to match the existing structure. This can weaken the overlay strength if you do it. They will grind the existing pavement down to where they meet flush together to prevent this.
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Inlay and pulverize in place are also areas of asphalt maintenance. You should use a milling machine to do these tasks. A depth of existing asphalt is removed during the inlay process. This depth is many times a previous overlay. The contractors will then 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.
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If you want to extend the life of asphalt, then seal coating is important and should not be neglected. Seal coating is a mixture of mineral fibers, emulsified asphalt, and water along with other admixtures. Seal coating the top layer of the asphalt will help prevent water from seeping in the surface of the pavement and this will help protect the top layer from wear for exposure to the sun and oxidation. This is where the asphalt gets its even black coating.