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6506-21 - Description Hot In-Place Recycling(HIR...

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Hot In-Place Recycling (HIR) Construction Methods & Equipment (From “Pavement Recycling Guidelines for State and Local Governments” by NCAT) Description On site, Hot In-Place Method That Rehabilitates Deteriorated Asphalt Pavements and Thereby Minimizes Use of New Materials Depth Recycled: 20-50 mm (25 mm Most Common) 4 Basic Steps Softening Pavement with Heat Scarification or Mechanical Removal of Softened Material Mixing with Recycling Agent, New Aggregate, New Binder, or New Mix Laydown and Paving Advantages of HIR Pavement Geometrics Preserved Corrects Surface Distresses Not Caused by Structural Inadequacy Can Modify Existing Surface Mix Advantages of HIR Can Improve Surface Frictional Resistance Relatively Cheap Needs Minimal Traffic Control HIR Processes Surface Recycling Repaving Remixing
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Surface Recycling Rehabilitation Process That Restores Cracked, Brittle, and Irregular Pavement in Preparation for a Final Thin Wearing Course Depth of 20-25 mm Most Common (50 mm Possible) Surface Recycling
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