Volume 35, Issue 1 (January 2012)

    In Situ Matric Suction and Moisture Content Measurements in Expansive Clay during Seasonal Fluctuations

    (Received 16 November 2010; accepted 19 July 2011)

    Published Online: 2011

    CODEN: GTJOAD

      Format Pages Price  
    PDF 9 $25   ADD TO CART


    Abstract

    In the design of flexible pavements using the mechanistic-empirical pavement design guide (MEPDG), water flow analyses are used to predict changes in the mechanical behavior of unsaturated subgrade soils. However, the water flow analyses in the MEPDG are not well validated using field measurements of moisture content and matric suction with time. A research study was initiated to measure the variation in matric suction and moisture content in an expansive soil during seasonal fluctuations. Specifically, a thermal conductivity-based suction sensor was fully evaluated and calibrated in the laboratory and was later installed with moisture sensors at different sites in Texas. This paper presents a summary of field measurements of matric suctions and moisture contents from a site in Houston. Comparisons of field measurements of matric suctions are compared with those interpreted from the soil water characteristic curve using field moisture content measurements, and a decent match was obtained up to matric suctions close to 800 kPa.


    Author Information:

    Puppala, Anand J.
    The Univ. of Texas at Arlington,

    Manosuthkij, Thammanoon
    PTT Research and Technology Institute,

    Nazarian, Soheil
    Center for Transportation Infrastructure Systems, The Univ. of Texas at El Paso,

    Hoyos, Laureano R.
    The Univ. of Texas at Arlington,

    Chittoori, Bhaskar
    The Univ. of Texas at Arlington,


    Stock #: GTJ103597

    ISSN: 0149-6115

    DOI: 10.1520/GTJ103597

    ASTM International is a member of CrossRef.

    Author
    Title In Situ Matric Suction and Moisture Content Measurements in Expansive Clay during Seasonal Fluctuations
    Symposium , 0000-00-00
    Committee D18