Many millions square metres of pavement have been rehabilitated with Cold In-place Recycling in North America since it first started in the State of California in the late 1970s, with, approximately four million tonnes currently being recycled every year.. In many areas the primary cause of pavement distress and failure is thermal cracking. Before the utilization of Cold In-place Recycling, the only effective treatment for cracked pavements was the total removal of the bituminous concrete layers. Cold In-Place Recycling uses the in-place bituminous pavement as a source of materials. The existing bituminous concrete pavement is reclaimed, transformed into a bituminous aggregate, which is then mixed with a new binder and laid down in-place. Cold In-place Recycling restores the longitudinal and transverse profile of the roadway. Recycled bituminous mixtures obtained from Cold In-place Recycling have mechanical properties that improve with time. They provide more fatigue resistance but less stiffness than regular standard hot bituminous mixtures at a young age. In addition, recycled bituminous mixtures offer improved mitigation of reflective cracking. This paper presents an overview of Cold In-place Recycling and a discussion of project selection, design practices, process equipment, construction procedures and the performance of recycled bituminous mixtures.
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