Volume 36, Issue 3 (May 2013)

    Preliminary Laboratory-Scale Model Auger Installation and Testing of Carbonated Soil-MgO Columns

    (Received 16 April 2012; accepted 28 November 2012)

    Published Online: 2013

    CODEN: GTJOAD

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    Abstract

    This paper presents details of the installation and performance of carbonated soil-MgO columns using a laboratory-scale model auger setup. MgO grout was mixed with the soil using the auger and the columns were then carbonated with gaseous CO2 introduced in two different ways: one using auger mixing and the other through a perforated plastic tube system inserted into the treated column. The performance of the columns in terms of unconfined compressive strength (UCS), stiffness, strain at failure and microstructure (using X-ray diffraction and scanning electron microscopy) showed that the soil-MgO columns were carbonated very quickly (in under 1 h) and yielded relatively high strength values, of 2.4–9.4 MPa, which on average were five times that of corresponding 28-day ambient cured uncarbonated columns. This confirmed, together with observations of dense microstructure and hydrated magnesium carbonates, that a good degree of carbonation had taken place. The results also showed that the carbonation method and period have a significant effect on the resulting performance, with the carbonation through the perforated pipe producing the best results.


    Author Information:

    Yi, Yaolin
    Ph.D. Candidate, Institute of Geotechnical Engineering, Southeast University, Nanjing,

    Liska, Martin
    Research and Development Manager, David Ball Group, Cambridge,

    Akinyugha, Akinyemi
    Ph.D. Candidate, Dept. of Engineering, Univ. of Cambridge, Cambridge,

    Unluer, Cise
    Postdoctoral Associate, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA

    Al-Tabbaa, Abir
    Reader, Dept. of Engineering, Univ. of Cambridge, Cambridge,


    Stock #: GTJ20120052

    ISSN: 0149-6115

    DOI: 10.1520/GTJ20120052

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    Author
    Title Preliminary Laboratory-Scale Model Auger Installation and Testing of Carbonated Soil-MgO Columns
    Symposium , 0000-00-00
    Committee D18