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    Volume 43, Issue 6 (November 2015)

    Assessment of Process Variables that Can Impact Results of Soluble Sulfate Evaluated by the Tex-145E Method

    (Received 24 January 2014; accepted 2 July 2014)

    Published Online: 26 November 2015

    CODEN: JTEVAB

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    Abstract

    Sulfate-induced heave has become an expensive problem in many states when expansive soils containing high levels of sulfate are stabilized with calcium based stabilizers such as lime or cement. Colorimetric assessment of soluble sulfate concentrations (SSC) is the most accepted indicator to predict the degree of risk associated with using chemical stabilization to treat expansive soils. Questions surrounding the effects of sulfate source, water to soil ratio, contact time, and separation methods were investigated. Samples of a soil from northeastern Ohio were spiked with ferrous sulfate heptahydrate (FeSO4·7H2O) to yield 300 and 3000mg sulfate/kg soil and with gypsum (CaSO4·2H2O) to yield 300, 3000, 6000, and 12 000mg sulfate/kg soil. Subsamples of the spiked soil were then mixed with water at a 1:20 ratio of soil:water, shaken, and allowed to rest from 12 to 24h. A sample of the soil solution from each mixture was obtained by four different methods and analyzed for sulfate by colorimetric method. There was no significant difference for the contact time used; however, a 24h contact time is recommended. Results of colorimetric testing indicated use of partial and full filtration provided the most accurate SSC readings.


    Author Information:

    Freese, Kevin
    Department of Civil Engineering, The Univ. of Akron, Akron, OH

    Abbas, Ala
    Department of Civil Engineering, The Univ. of Akron, Akron, OH

    Senko, John
    Department of Geosciences, The Univ. of Akron, OH

    Cutright, Teresa J.
    Department of Civil Engineering, The Univ. of Akron, Akron, OH


    Stock #: JTE20140027

    ISSN:0090-3973

    DOI: 10.1520/JTE20140027

    Author
    Title Assessment of Process Variables that Can Impact Results of Soluble Sulfate Evaluated by the Tex-145E Method
    Symposium ,
    Committee D04