United States Department of Transportation
i
Characterizing Existing Asphalt Concrete Layer Damage for Mechanistic Pavement Rehabilitation Design
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2018-08-01
[PDF-5.80 MB]
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OCLC Number:1057366368
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Abstract:Designing rehabilitation strategies for flexible pavements exhibiting various types and levels of distress is a challenge. An important factor related to the design of a rehabilitation strategy is the use of a reliable procedure to evaluate the in-place condition of pavements. A project-level pavement evaluation program should consist of multiple activities to assess structural condition, identify the types of pavement deterioration, and determine the cause of deficiencies that need to be addressed during pavement rehabilitation.
One of the critical steps for evaluating the in-place structural condition of existing pavement layers is deflection-basin testing. Deflection basins are used to backcalculate the elasticlayer modulus of existing asphalt concrete (AC) layers, which is considered input level 1 for rehabilitation designs in accordance with the Mechanistic-Empirical Pavement Design Guide.(1) Most agencies measure deflection basins as part of their pavement evaluation programs, but few actually use the data to determine the in-place condition of the AC layers. Deflection data are used to establish analysis sections and/or estimate the resilient modulus of the subgrade soils. However, more recently, agencies have started to use the backcalculated elastic layer modulus to determine the amount of in-place fatigue damage in the existing AC layers.
This report evaluates the use of deflection-basin data to determine the in-place structural condition of AC layers for rehabilitation design in accordance with the Mechanistic-Empirical Pavement Design Guide—A Manual of Practice.(2) A common use of deflection data is to backcalculate in-place layered elastic modulus values.
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