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    Volume 43, Issue 5 (September 2015)

    Evaluation of Measurement Methodologies Used for Establishing Water Retention Characteristic Curve of Fly Ash

    (Received 12 April 2013; accepted 16 June 2014)

    Published Online: 09 September 2015

    CODEN: JTEVAB

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    Abstract

    Fly ash (FA) has potential applications in geotechnical and geoenvironmental projects, where its water retention characteristic curve (WRCC) is important. The main objective of this study was to establish the inherent range of measured suction of FAs using four different tools: tensiometer (TM), matric potential sensor, equitensiometer (EQT), and WP4 dew point potentiameter with a varying measurement range. Based on the measured results, the variability of WRCC equation parameters of four FAs collected from different thermal power plants were studied. Further, the sensitivity of a different range of measured suction on WRCC equation parameters of FA was investigated. The study indicated that the possible range of measurable suction for FA is 1 to 1000 kPa, which can be measured conveniently with an EQT. The parameters of FA were not influenced by high suction measurements (>1000 kPa) of WP4. The suction data (>1000 kPa) obtained using the WP4 can be appended with a low-suction-range instrument such as a TM for a better representation of the WRCC of FA. However, the study indicated that WRCC parameterization of FA is influenced more by the low range of suction.


    Author Information:

    Abhijit, D.
    Dept. of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam

    Sreedeep, S.
    ASTM Member, Associate Professor, Dept. of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam


    Stock #: JTE20130091

    ISSN:0090-3973

    DOI: 10.1520/JTE20130091

    Author
    Title Evaluation of Measurement Methodologies Used for Establishing Water Retention Characteristic Curve of Fly Ash
    Symposium ,
    Committee D18