![]() ![]() This chapter mainly introduces materials, design, construction, construction quality control, quality inspection and acceptance of the thin overlay and ultra-thin overlay. Using warm mixing technology and dense grading Ultra-thin overlay Ultra-thin overlay technology using modified emulsified asphalt and open grading (represented by Shell Novachip) At present, the ultra-thin overlay commonly used in China can be divided into three categories, including: The ultra-thin overlay can greatly reduce the cost of pavement maintenance engineering under the premise of achieving the same performance of the road surface, so it has gradually replaced the thin overlay technology. The ultra-thin overlay is an upgraded version of the technology of the thin overlay. Clean the pavement to remove any dirt, gravel, or trash that may have appeared since the preliminary cleaning. Close the work area to traffic by erecting barricades, tape, or other control devices. ![]() The main functions of the thin cover are to improve the flatness, restore the surface roughness, make the original surface damage (such as potholes, cracks, ruts, etc.) of the pavement to a certain extent, and extend the service life of the pavement. When the day arrives to install your asphalt overlay, the contractor will see that the following steps are completed. Generally, the hot-mixed asphalt concrete cover with a compacted thickness of 30 mm ± 5 mm is called a thin overlay. During the winter that moisture freezes and continues to break the concrete down. When concrete deteriorates, it draws and holds moisture. It will, however, require a little more maintenance than a typical asphalt overlay. Thin overlay is a thinner overlay compared to traditional overlay (usually more than 40 mm thick). An asphalt overlay is cheaper to install than replacing concrete and can provide a smooth ride over deteriorating concrete. ![]()
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