![]() ![]() There are 3 different phases of performance a pavement can evolve into after being constructed. This article provides guidance on when to choose thin overlays, how to select materials and design the mixes, construction and quality control, and what type of performance benefits to expect. Thin asphalt overlays are popular approaches to pavement preservation because of their ability to provide improved ride quality, reducing pavement distresses, maintaining surface geometrics, reducing noise levels, reducing life cycle costs and providing long-lasting service. Thin Asphalt Overlays for Pavement Preservation Unfortunately, many contractors skip this step and thus they have less than acceptable results. This is the “glue” that is used to adhere the new asphalt layer to the existing asphalt. Prior to doing an asphalt overlay, a tack coat primer should be applied to the surface where the asphalt will be laid. What is the first step of an Asphalt Overlay? It is called Tack Coat If the new layer of asphalt is laid on top of a really deteriorated asphalt, the new layer will follow the old asphalt cracks (deep cracking) and sprays in a very short period of time. An asphalt overlay process should not be done on a driveway or parking lot that is relentlessly fractured, disintegrating, and curly or has plummeting, soft spots. Contingent on the amount of cracking, disintegrating or lower areas, those areas can be cut out or patched and then a new layer of asphalt can be paved. An overlay can be done when the existing asphalt pavement is still in good shape, even if there are areas where the conditions are not so good. ![]() Know When to Overlay: Guidelines for Effective Asphalt PavingĪn asphalt overlay is basically paving a second layer of asphalt over an existing asphalt layer. ![]()
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