United States Department of Transportation
i
Implementation of Small Samples for Developing Full-Depth Recycling Mix Designs
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2019-01-01
[PDF-883.85 KB]
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Edition:July 2014–August 2016
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Abstract:Oftentimes renewal of deteriorated pavements relies on stabilization to strengthen pavement materials. Typically, this process takes place with full depth recycling, where in-situ materials receive treatment and mixing with a stabilizing agent to result in a renewed and strengthened base or subbase material. A properly designed and constructed stabilized base or subbase mixture can significantly reduce the required total pavement thickness to meet pavement design requirements. Traditionally, these stabilized mixtures are designed in the lab based on unconfined compressive strength. However, given typical field material variability, different potential stabilizers, and different treatment levels, the lab mix design historically requires significant amounts of material and significant time to return results. This project focused on initial implementation of a small sample mix design approach using reduced sample sizes and indirect tensile strength. The small sample approach allows practitioners to screen multiple factors of material proportions and stabilizers all while requiring less material than traditional compressive strength methods. Additionally, the small sample approach can return test results in as little as 5 days.
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