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Characterization of Asphalt Drainage Course Layers
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    Asphalt Drainage Courses (ADCs) have generally been required under all four-lane flexible pavements in Mississippi. Asphalt drainage courses are designed in Mississippi using No. 57 limestone, sandstone or granite combined with 2.5 percent asphalt binder. This research study had two primary objectives related to ADCs. First, the research was to characterize ADC layers for default input values into Mississippi’s ME pavement design system. Secondly, the research was to characterize ADC layers in the field to provide inputs for ADC layers in ELMOD5. In order to investigate the first objective, six different aggregates were obtained and tested. The exact test method selected for testing these materials was based upon a literature review and discussions with industry experts on the testing of these materials. Based upon the testing of these materials, a default modulus value of 60,000 psi was recommended for use with the new M-E pavement design system. In order to investigate the second objective, falling weight deflectometer (FWD) testing was conducted on six in-place pavements in which an ADC layer was included. Data from these six pavements were analyzed and recommendations provided for inclusion into ELMOD5. These recommendations were based upon the conditions of the edge drains for the pavements and had input modulus values ranging from 60 ksi to 200 ksi.

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