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Evaluation of Chemically Stabilized Subgrades with High Sulfate Concentrations

Kennedy, Kalub S.
http://orcid.org/0000-0003-2627-2509
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554807825765069

Abstract Details

2019, Master of Science (MS), Ohio University, Civil Engineering (Engineering and Technology).
This thesis evaluates natural and chemically stabilized subgrade soils from five project sites throughout Ohio. Three of the five project sites were historically known to have moderate to high sulfate concentrations in the natural soils (DEF-24-2.67-W, LAK- 2-7.76-W, MRW-71-3.17-N), while the other two sites were known to have little to no sulfate levels (CLA-70-13.98-W, CLI-73-6.52-E), and were used as controls. The main objective of the study was to compare in-situ and laboratory test results to determine if there were formations of ettringite or thaumasite in the soil, which can lead to sulfate heave and premature failure of pavement. Several field tests were performed such as PSPA, FWD, LWD, DCP, and SPT. Standard soil tests were performed on natural and chemically stabilized samples, such as gran size analysis, Atterberg limits, organic content, moisture content, and pH, as well as a chemical analysis comprising of neutralization potential, sulfate concentration, and X-ray diffraction (XRD). Analysis showed no major differences of moduli for pavement or soil layers between control and non-control. Results showed that sites where sulfates were known to exist, the chemically stabilized layers had sulfate concentrations greater than 3000 ppm and the pH was just barely greater than 10, which is an indication of concern for ettringite and thaumasite formation. However, the chemical analysis did not indicate formation of either mineral, therefore all conditions were not met.
Issam Khoury (Advisor)
240 p.
Civil Engineering; Geotechnology; Soil Sciences
Sulfate-induced heave; ettringite; thaumasite; subgrade stabilization; cement stabilization; lime stabilization; PSPA; DCP; FWD; LWD; SPT; XRD

Recommended Citations

Citations

  • Kennedy, K. S. (2019). Evaluation of Chemically Stabilized Subgrades with High Sulfate Concentrations [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554807825765069

    APA Style (7th edition)

  • Kennedy, Kalub. Evaluation of Chemically Stabilized Subgrades with High Sulfate Concentrations. 2019. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554807825765069.

    MLA Style (8th edition)

  • Kennedy, Kalub. "Evaluation of Chemically Stabilized Subgrades with High Sulfate Concentrations." Master's thesis, Ohio University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554807825765069

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Ohio University and OhioLINK.