United States Department of Transportation
i
Improving lab compaction specifications for flexible bases within the Texas DOT.
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2009-04-01
[PDF-1.46 MB]
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Edition:Technical report; Sept. 2006-Aug. 2008.
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Abstract:In Test Methods Tex-113-E and Tex-114-E, the Texas Department of Transportation (TxDOT) employs an impact hammer method of sample compaction for laboratory preparation of road base and subgrade materials for testing. In this third and final report documenting efforts to improve the relationship between laboratory material compaction and field construction, Texas Transportation Institute (TTI) researchers present results from efforts to identify whether TxDOT should require Modified Proctor compaction for bases, and whether TxDOT should modify its existing laboratory compaction methods to improve the state-of-the-art. Efforts to evaluate whether a shift to Modified Proctor was warranted proved unfruitful due primarily to a lack of interest and lack of participation from field offices. However, prior work in this project and prior in-house investigations by TxDOT indicate little incentive exists for TxDOT to require Modified Proctor for its base materials. An immediate technique to enhance the state-of-the-art of sample compaction within TxDOT is to implement the Soil Compactor Analyzer (SCA) system developed in this project. The SCA permanently installs onto the laboratory automatic tamper and enables calibration of the applied compaction energy along with real-time monitoring of the important operating parameters of the tamper during the sample construction process.
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