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Guide to Asphalt Maintenance There are four areas to consider when it comes to asphalt maintenance. Asphalt begins to fail when water penetrates into the asphalt base. Asphalt gets brittle and dry in the course of time, and when this happens the material wears away and begins to crack which then allows water to seep into the base of the pavement. There is movement in the pavement’s base material when water slowly seeps into the base through 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. A grinding machine can also be used. 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 1.5 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. You should extend the amount of removal up to a foot past the area that has failed. The maintenance method using asphalt overly is one that is affordable and provides a new wearing surface. There are certain factors that one needs to be aware of when dealing with asphalt overlay. The overlay should have a maximum thickness of 2.5 inches and a minimum of 1.5 inches. Grinding down the pavement should not be done on the overlay section so that he existing structure will be matched. This can weaken the overlay strength if you do it. The existing pavement will be ground down to where they meet flush together in order to prevent this.
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Inlaying and pulverizing in place is another aspect of asphalt maintenance. This is accomplished using a milling machine. During the inlay process, a depth of the existing asphalt is removed. This depth is many times a previous overlay. Contractors will then put back asphalt back to the pre-inlay elevation. Pulverize in place method reduces all of the asphalt to base rock sized particles.
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If you want to extend the life of asphalt, then seal coating is important and should not be neglected. The contents of seal coating is a mixture of mineral fibers, emulsified asphalt, and water together 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 gives the asphalt its even black coating.