United States Department of Transportation
i
Performance evaluation of subgrade stabilization with recycled materials.
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2016-02-29
[PDF-1.96 MB]
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Alternative Title:Appendix A
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Abstract:Due to rising costs of good quality acceptable materials for remove/replace options and traditional
subgrade stabilization materials, MDOT is in need to identify potential recycled materials to treat
unacceptable subgrade soils. Use of recycled materials may not only provide less costly
alternatives for subgrade stabilization, their use may also alleviate landfill disposal challenges.
This research study is aimed at identifying short-term and long-term advantages and
disadvantages associated with subgrade stabilization using recycled materials such as Cement
Kiln Dust (CKD), Lime Kiln Dust (LKD), flyash, concrete fines and mixtures of LKD and FA. An
extensive laboratory testing program was conducted to determine suitability of the above recycled
stabilizers for subgrade stabilization for common problematic soils found in Michigan. The
laboratory investigative program involved determining the basic soil properties, developing mix
designs to select proper stabilizer percentage for each soil type, CBR testing to determine
pavement design parameters, and laboratory freeze/thaw testing to determine durability of
stabilized subgrade sections. A limited field investigation was performed to assess insitu
performance of stabilized subgrades. Based on the findings of both investigations, stabilizers
were selected for long-term subgrade stabilization for different soil types and their associated
pavement design inputs were determined. A design matrix with cost considerations was also
developed to aid the selection of subgrade treatment options.
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