TxDOT Research Library - TxDOT Research Project

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Using Small Sample Sizes in Full Depth Reclamation (FDR) Laboratory Mix Designs

What Was the Need?

Currently, single laboratory Full Depth Reclamation (FDR) design takes between 300 and 400 lbs. of existing highway material for sampling. The current process is problematic as it leaves patches requiring future maintenance and limits the ability to perform dual stabilizer treatments as well as multiple location testing. In addition, the current test methods for a single design take a significant period of time to complete (1 month in some situations).

Project Summary

This project focused on initial implementation of a small sample mix design approach using reduced sample sizes and indirect tensile strength. Researchers evaluated the recommended stabilization level based on results from UCS-based mix designs and the small sample mix design procedure. Researchers also evaluated the attained specimen density in the small sample procedure as compared to the Tex-113-E maximum density

What's the Solution?

The project illustrates how, with the amount of material required for one UCS specimen, the small sample procedure can perform an entire mix design. This reduction in material quantity requirements offers a major advantage since many times four to eight different mixture designs may be under consideration. The small sample design procedure offers a quick method to determine viable stabilization options; if desired, the most promising treatments can then be cross-checked with UCS.

Project Number

5-6271-03

Status

Completed

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