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Evaluation of soil moisture barrier.

File Language:
English


Details

  • Creators:
    Browning, Gary
  • Corporate Creators:
    Mississippi. Dept. of Transportation. Research Division
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/MS-DOT-RD-99-21 & 23
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Mississippi
  • Edition:
    Final report.
  • Corporate Publisher:
    Mississippi. Dept. of Transportation
  • Abstract:
    This report is an extension report and examines one of the measures being tried to stabilize the development

    of pavement damage on expansive soils, which is the use of horizontal moisture barriers. The moisture barrier

    will not stop horizontal flow, but is designed to stop rainwater from penetrating into the subgrade soils

    thus reducing soil swelling, measured by a reduction in the moisture variance.

    On both sides of the roadway, the moisture barrier begins 9' (2.74 m) from the pavement centerline, extends to

    6' (1.83 m) beyond the bottom of the ditch, and is under a minimum of 18" (0.46 m) of soil. The performance

    of the moisture barrier was measured twice yearly by moisture sampling and four times yearly by roadway

    roughness measurements.

    The moisture barriers on both project did not reduce the IRIs or the moisture variance, as they were expected

    to do. Future use of this design of horizontal moisture barriers on pavements is not recommended. The

    moisture barrier did not produce a smoother ride than the unprotected pavement in the roughness tests or reduce

    the moisture variance.

  • Format:
    PDF
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:577d79d20753c92164fa2f160bcb53a72d04f7ee05dff53ed2d3a15e5c176e73b903ee21ed22b318f47ce1b425a498c310494424984d90c9c6d69eee1d03d431
  • Download URL:
  • File Type:
    Filetype[PDF - 1.21 MB ]
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