Cold in-place recycling, cold central plant recycling, and full depth reclamation are cost-effective, environmentally conscious pavement rehabilitation or reconstruction techniques. Although these techniques are not new, they have not been widely adopted among state agencies. There has, however, been a recent resurgence in interest in these techniques. To date there are no national specification guidelines for these processes to assist in their widespread implementation, and those specifications that do exist often have a wide range of requirements. This paper presents the results of a review of state and local agency specifications for pavement recycling techniques and offers suggestions to help agencies achieve a better and longer-lasting product when specifying pavement recycling techniques.

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In 2019 a series of test sections were constructed on 70th Street in Albertville/Otsego, MN. The existing roadway was badly deteriorated with an international roughness index value above 300 in./mi, which places it in a “poor” performance category. A combination of treatments including cold in-place recycling (CIR), cold central plant recycling (CCPR), and full depth reclamation (FDR) stabilized with foamed or emulsified asphalt were used to evaluate performance in cold regions. Sections including a typical hot mix asphalt (HMA) mill and fill were also evaluated. All sections contained a 1-in. HMA thinlay as the wearing surface. This paper presents the laboratory testing data for the mixtures, including application of HMA tests not typically applied to CIR, CCPR, and FDR, the field performance to date, and a new approach to connecting laboratory data to field performance.