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    Volume 45, Issue 5 (September 2017)

    Use of Geogrid Encasement to Increase the Ductility of Cement-Mixed Clay

    (Received 14 January 2016; accepted 27 June 2016)

    Published Online: 2016

    CODEN: JTEVAB

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    Abstract

    Improvement of soft clay by mixing with cement is widely adopted in Thailand to increase the strength and reduce the settlements. The improved soft clay exhibits better strength and permeability properties; however, the improved soil exhibits low tensile strength and brittle behavior. On the other hand, it is known from the literature that geosynthetics have been used for soft soil improvement in conjunction with stone column (SC) and sand compaction pile (SCP) techniques. The lateral deformation of SC and SCP could be significantly decreased by geosynthetic encasement; therefore, the vertical load could be efficiently transferred to deeper soil layers. In this study, a series of unconfined compression tests were performed on cement-mixed clay specimens with a diameter of 75 mm and height of 150 mm. Cement contents used were 10 %, 15 %, and 20 % by dry mass of clay. The water-to-cement ratio used was 0.6 and total clay water contents were 105 % for the normal-water-content case and 160 % for the high-water-content case. A polyester geogrid was used to encase the specimens. Prior to the test, specimens were cured for 7, 14, and 28 days. It is found that the geogrid encasement has enabled the soil samples to sustain the axial stress for large axial deformations, even after the local failure in the cement-mixed clay matrix. On the other hand, the unreinforced specimens exhibited strain-softening behavior with a great reduction in axial stress with increasing strain. Encasements with geogrids were found to substantially increase the ductility of cement-mixed clay.

    Author Information:

    Kaewsresai, K.
    Dept. of Civil Engineering, Faculty of Engineering, King Mongkut's Univ. of Technology Thonburi, Bangkok,

    Kongkitkul, W.
    Dept. of Civil Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok,

    Jongpradist, P.
    Dept. of Civil Engineering, Faculty of Engineering, King Mongkut's Univ. of Technology Thonburi, Bangkok,

    Horpibulsuk, S.
    School of Civil Engineering, and Center of Excellence in Innovation for Sustainable Infrastructure Development, Suranaree Univ. of Technology, Nakhon Ratchasima,


    Stock #: JTE20160030

    ISSN:0090-3973

    DOI: 10.1520/JTE20160030

    Author
    Title Use of Geogrid Encasement to Increase the Ductility of Cement-Mixed Clay
    Symposium ,
    Committee D18