Abstract
Pavement recycling techniques, including full depth reclamation, cold in-place recycling, and cold central plant recycling, are effective at rehabilitating existing pavements and constructing new pavements while reducing construction costs, environmental impacts, and construction time. Despite these benefits, these techniques are not used as often as they could be, in part because agencies are unable to assess rapidly the quality of the recycled material or to determine when a recycled pavement has sufficient structural capacity to handle traffic or construction equipment for surfacing, or both, without causing damage, especially at early ages. To describe better the time-critical properties of recycled materials, a series of tests was conducted to assess the stiffness, penetration resistance, and shear and raveling properties of laboratory-produced recycled mixtures sampled from field projects. These tests were conducted to evaluate their potential to discriminate among various factors affecting the behavior of the materials in the laboratory. The study found that penetration resistance tests were most sensitive to the factors assessed, followed by stiffness and then torque values from shear and raveling tests. These tests will be further validated using additional mixture types in the laboratory, and their performance in the field will be studied.
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