United States Department of Transportation
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Abstract:There is a considerable emphasis on waste management at national, State, and local levels. Government at various levels has passed or is considering legislation or ordinances that mandate the recycling of waste materials or by-products. Reusing or recycling old, deteriorated pavement structure in the rehabilitation or reconstruction of a new structural section is nothing new. Forms of asphalt pavement recycling date back as far as 1915. However, asphalt pavement recycling in its present form first took place in the mid-1970s, when interest in asphalt pavement recycling was sparked by inflation of construction prices and by the oil embargo. In response to these economic pressures, the Federal Highway Administration (FHWA) initiated Demonstration Project 39, Recycling Asphalt Pavements, in June 1976. The project showed that asphalt pavement recycling was a technically viable rehabilitation technique, and it was estimated that the use of reclaimed asphalt pavement would amount to approximately 15% of the total hot mix asphalt production by the mid-1980s. It was expected that most of the asphalt pavement removed would be reused in new pavement construction or overlays. This publication reports on a project initiated in mid-1992 to assess the state-of-the-practice of recycled hot mix asphalt production. The scope of this project included site visits to 17 State highway agencies, with at least two state highway agencies in each FHWA region. Field contacts included discussions with design, research, and construction individuals from States, contractors, and industry. This report summarizes the state-of-the-practice for the use, materials mix design, structural design, construction, and performance of recycled hot mix asphalts.
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