Cracks in the asphalt along expansion joints will not cause the surface to fail, but it will need to be crack sealed over time to maintain a water resistance. Mechanistic Responses of Asphalt Concrete Overlay Over Jointed Plain Concrete Pavement Using Finite Element Method. Asphalt concrete structural overlay design can be broadly categorized into the following (modified after Monismith and Finn, 1984 1 ): Engineering judgment. Therefore, they are considered rehabilitation, although they typically have some maintenance-type benefits as well. When you pave over concrete with asphalt, these expansion joints will cause the asphalt surface to shift over time potentially creating cracks and bumps. Structural overlays are used to increase pavement structural capacity. Because concrete is a harder surface that does not have as much give as asphalt, expansion joints are cut into the surface to help prevent cracking from seasonal expansion. These new layers are generally about 1.5- to 3-inches thick, depending on the demands on the asphalt and the depth of surface asphalt removed. Asphalt overlay is an option for some asphalt surfaces that are in disrepair, but paving asphalt over concrete comes with some catches.Ĭoncrete paved surfaces are not compressed and compacted like asphalt is, rather the concrete adheres and fills voids and irregularities with the soil and subgrade beneath it. An asphalt overlay is a layer of new asphalt applied over the existing base layer of asphalt on a driveway, parking lot or road. When a concrete surface deteriorates there is not an easy option to repave the surface with concrete without ripping the surface up entirely. A Concrete Overlay raised our pavement elevation out of the high-water table (e.g. In certain situations, asphalt overlay can be applied to a concrete paved surface. A Concrete Overlay kept us out of the subgrade vs.
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