50 Micro-Surfacing ($$$$) Micro-surfacing is a more advanced form of slurry seal that uses a mixture of polymer-modified asphalt emulsion, graded aggregate, mineral filler, water and other additives. It is applied to existing road surfaces to create a new wearing surface and to address a variety of surface imperfections. Here’s a step-by-step process of micro-surfacing: 1. Surface Preparation: The existing pavement is cleaned to remove debris and loose particles to ensure the micro-surfacing material adheres properly. 2. Mixing: Micro-surfacing material is mixed on-site in specialized equipment known as a micro-surfacing mixing machine. The mix includes a polymer‑modified asphalt emulsion, which provides enhanced performance characteristics compared to traditional slurry seals. 3. Application: The mixed micro-surfacing material is spread onto the pavement surface using a specialized spreader box attached to the machine. The spreader box ensures an even application at the specified thickness. 4. Setting and Curing: Micro-surfacing sets and cures quicker than traditional slurry seals due to the use of fast-setting polymers. This allows for a shorter period before the roadway can be reopened to traffic. 5. Traffic Ready: Typically, micro-surfacing can accommodate traffic within a couple of hours after application, which minimizes disruption and road closure time. The benefits of micro-surfacing include: • Rutting and Raveling Reduction: It can fill wheel ruts and prevent the loss of aggregate (raveling). • Skid Resistance: The aggregate used in micro-surfacing provides a skid‑resistant surface that improves safety. • Quick Traffic Return: Due to its rapid setting time, micro-surfacing allows roads to return to service faster compared to other treatments. • Versatility: It can be applied to various pavement types, including high-traffic roadways, residential streets and airport runways. • Cost-Effectiveness: As a maintenance treatment, micro-surfacing is less expensive than more extensive repairs and can extend the life of the pavement. • Weather and Aging Protection: It shields the pavement from the effects of weather and delays the aging process of the asphalt binder. Micro-surfacing is suitable for addressing surface-level pavement issues such as oxidation, loss of friction and minor rutting. Microsurfacing is an exceptional product to fill ruts up to 1” thick due to failed asphalt with structurally sound base. It is not intended to repair structural damage or to correct significant base failures.
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