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Cold in-place recycling and full-depth recycling with asphalt products (CIR&FDRwAP).
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    Final report
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  • Abstract:
    In the 60’s, 70’s, and 80’s, many Illinois local road agencies successfully used “conventional” asphalt emulsions for In-Place Recycling to produce Emulsion-Aggregate-Mixtures (EAMs). In more recent years, these emulsions have not been widely used for Cold-In-Place Recycling construction. A major constraint to the continued utilization of EAMs was the long “drying time” (loss of moisture following mixing and prior to compaction) associated with the process. The use of “foamed-asphalt” and improved emulsion compositions (called “engineered emulsions”) has alleviated (some suggest eliminated) some of the concerns that have limited the use of emulsions for Cold-In-Place Recycling. The project objective is to evaluate and contribute to the facilitation and implementation of currently available CIR&FDRwAP (ColdIn-Place Recycling and Full-Depth Recycling with Asphalt Products) technology. An “information/data” survey was conducted, ten selected CI&FDIRwAP projects were documented and evaluated, mixture properties (modulus, strength, fatigue) were established, thickness design options were evaluated, mixture design approaches were evaluated, and construction aspects considered. The mixture design procedures currently used by SemMaterials for Engineered Emulsions and the Wirtgen procedure (or procedures similar to the Wirtgen procedure) for foamed asphalt mixtures are recommended for interim use. Typical successfully used specifications for Full-Depth Recycling and Cold-in-Place-Recycling are presented. It is recommended that a “Working Group” be established to refine/further adapt the mixture design procedures and construction specifications for Illinois Local Roads and Streets utilization. Project information/findings/results support the recommendation that the CIR&FDRwAP process be considered a “standard procedure.” It currently is incorporated into a project as an “experimental feature.”
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