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Optimization of Recycled Asphalt Concrete and Base Materials for Bases of New Asphalt Concrete Pavements
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2000-12-01
[PDF-15.86 MB]
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Abstract:Asphalt pavement rehabilitation techniques used in South Dakota include the process of reclaiming the existing asphalt, and a part of the underlying aggregate base, for use as a new aggregate base material. The reclamation process is often called Process in Place (PIP). The use of millings as an unbound base, termed salvage for this report, was also evaluated. The South Dakota Department of Transportation has experienced some problems with PIP, either during construction or poor performance once the project is in service. This research was to evaluate the performance of PIP, both during and after construction. The research included a literature search, interviews, the evaluation of 10 sections selected from existing projects that used reclaimed asphalt in the base, and the construction of test sections using three reclaimed asphalt to aggregate blend ratio, three construction processes, and two compaction efforts. In addition, laboratory tests were conducted to identify properties that may be unique to reclaimed asphalt. Reclaimed asphalt does relax, or consolidate with time, which can reduce its structural capacity, and/or contribute to rutting. PIP was found to be a valuable alternative to use for the rehabilitation of asphalt pavements. The reclaimed material, as used in PIP, provides less structural support than aggregate base. Limited the asphalt content and densification during construction are keys to satisfactory performance. PIP was found to be able to bridge very soft subgrade conditions that other forms of construction such as the salvage process, would have problems with.
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