United States Department of Transportation
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Routine Maintenance Uses for Milled Reclaimed Asphalt Pavement (RAP)
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1992-12-01
[PDF-6.13 MB]
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Edition:Interim Report - Sept. 1987 to Oct. 1992
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Abstract:The overall objective of this study was to determine the most economical and effective routine maintenance uses-for asphalt pavement millings. Specific objectives include (1) determine existing effective uses of milled RAP, (2) determine effectiveness of new, untried ideas and improvements on existing uses through field experimentation, and (3) provide the Department with a mode of implementation. Most of the uses addressed in this study refer to routine maintenance applications; although other uses were reviewed. Districts were interviewed in Texas and other states to identify current methods for using RAP. The literature was also reviewed to identify new and innovative approaches. RAP was collected in three locations throughout the state to characterize its laboratory properties. Cold mix designs were performed using different emulsified admixtures. The effects of these emulsions were then evaluated on the properties of the blended RAP mixtures. Fourteen field projects were evaluated in this study. The objective of the field study was to identify and evaluate existing Departmental uses of RAP, investigate and assess the value of new uses for RAP, and to collect video footage of these activities for the production of videos to support their implementation by the Department. Samples of the field-produced RAP maintenance mixes were obtained and tested in the laboratory. Laboratory properties of the treated RAP mixtures were characterized as well as corresponding control maintenance mixtures. These properties will later be correlated to pavement performance. The Department has an ongoing study to monitor the performance of the maintenance field projects for a period of two years.
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