Improving and Developing Pavement Design Inputs and Performance Functions for Cold Recycled Pavement Layers in Minnesota

Status:  Active
Project Start Date:  11/23/2022


Cold recycling technologies are being used for flexible pavement rehabilitation because of their economic and environmental benefits. The three main cold recycling methods for rehabilitating pavement layers in Minnesota are cold in-place recycling (CIR), cold central plant recycling (CCPR), and stabilized full depth reclamation (SFDR). The recycled layers contain reclaimed asphalt pavement (RAP) and aggregate base (in the case of SFDR), stabilized with asphalt emulsion or foamed asphalt and optionally active fillers (cement or lime). Due to the composition of these mixtures, they behave as partially bonded (in between granular base and hot-mix asphalt) materials. Currently, this material behavior is inadequately characterized, resulting in overdesigned pavement structures. The main goal of this research is to improve the current pavement analysis and design methodologies to appropriately characterize and evaluate cold recycled pavement layers.

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