Pavement Patching Practices (2014) / Chapter Skim
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3 This chapter introduces the synthesis topic and need for information on current pavement patching practices. It defines the scope of the project and the approach used to gather pertinent information.
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4 survey to identify states with the most information on particular aspects of patching practices. A total of 48 states plus the District of Columbia responded to the survey; a response rate of 96.1%.
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5 In concrete pavements, some of the distresses that can be addressed through patching include deterioration around cracks (such as durability "D" cracks, map cracking, and longitudinal or transverse cracks) , scaling, popouts, and blowups.
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6 Patch Materials A wide variety of materials is used for patching, especially for concrete pavements. Some form of asphalt mixture is commonly used to patch both asphalt and concrete pavements.
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7 picks and shovels, or milling machines)
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8 of concrete pavements as used in the SHRP research on partial depth spall repair include the following (6) : • Saw and patch -- where straight vertical faces are produced by sawing.
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9 stability and prevent draindown of the binder. Spray injection patching was defined in "Patch Preparation and Placement Methods." The "Local Materials" were generic, "every day" cold mixes (8)
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10 modified pocket penetrometer. Another acceptance test evaluates the cohesion of the patching material.
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11 • Installation temperature had minimal effect on performance except for the longitudinal cracking of polymer and cementitious patching materials in the dry-freeze region. • Type III cement performed comparably to proprietary cementitious patching materials.
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