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Role of sulfates on highway heave in Lake County, Ohio.

File Language:
English


Filetype [PDF - 10.28 MB]

Details

  • Creators:
    Weir, Monica ; Mandell, Angelic ; Farver, John
  • Corporate Creators:
    Bowling Green State University. Dept. of Geology
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/OH-2014/4
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Ohio
  • Corporate Publisher:
    Ohio. Dept. of Transportation. Office of Statewide Planning and Research
  • Abstract:
    Samples from borings in areas of heave on Route 2, Lake County, OH were analyzed for the amount, mineral form, ; and distribution of sulfates. In addition, samples of non-stabilized (NSS) and cement-stabilized (CSS) soils from ; three stations along Route 2 were analyzed for mineralogy and sulfate content. Finally, swell tests were run using ; the NSS samples to evaluate the degree of swelling and the role of ettringite. The sulfate content in the natural ; subgrade soil samples range from low (<3000 ppm) to unacceptable risk (>10,000 ppm) for heaving based on the ; TxDOT guidelines, and 36% tested above the moderate risk level (>5000 ppm). Gypsum and/or anhydrite were ; detected in 64% of the samples. The CSS samples contained white precipitates that were largely calcite, but with ; measurable amounts of ettringite as well. The NSS did not contain ettringite but had sulfate levels of moderate to ; high risk (4880 to 6107 ppm). Swelling of up to 8% was observed in the swell test samples; however, the amount of ; swelling did not correlated with the amount of sulfate present in the soil. Ettringite crystals were found in all of the ; swell test specimens after the experiment. In some cases the crystals were flat and coated the soil particles while ; others were long needle-like crystals that radiate out from bundles. This difference in crystal shape is thought to ; relate to the difference between primary and secondary ettringite growth in the samples.
  • Format:
    PDF
  • Funding:
    SJN 134694
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/28619/dot_28619_DS1.pdf
  • File Type:
    Filetype[PDF - 10.28 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:5c790c0240e0023183588dc331026abe83dd53a9c0f6dc1c87f6ed91d748bad3
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