Abstract
In the past few years, asphalt emulsion Cold In-Place Recycling (CIR) has been used successfully with asphalt emulsions in asphalt concrete pavement rehabilitation in China. However, there are currently no existing performance specifications using the Superpave Gyratory Compactor (SGC) in China for the development and verification of asphaltic CIR mix designs. The objective of this study was to develop performance based specifications through laboratory testing and field verification of three CIR projects. Laboratory testing was completed at different emulsion contents through the Marshall Stability and indirect tensile strength tests. In addition, the indirect tensile test, using a freeze/thaw cycle, and a rutting test were performed at the predicted optimal emulsion content. The test results were compared with field data recorded before and after the pavement rehabilitation process and incorporated into a set of performance specifications. The results confirmed that asphaltic CIR is an effective treatment for asphalt pavement preservation and maintenance.
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