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    Volume 40, Issue 6 (November 2017)

    The Use of Carbonation Depth Techniques on Stabilized Peat

    (Received 12 September 2016; accepted 8 May 2017)

    Published Online: 2017

    CODEN: GTJODJ

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    Abstract

    The phenolphthalein indicator method, the pH of slurries method, X-ray powder diffraction analysis (XRD), and Fourier transform infrared spectroscopy (FTIR) are all commonly associated with evaluating the carbonation front depth in concrete. Recent research (using a closed chamber method) has indicated that stabilized peat is a net sink of carbon dioxide (CO2) (at least in the short term), as the binder takes in CO2 both from the atmosphere and any CO2 released by oxidized peat. Therefore, the application of carbonation depth techniques to stabilized peat are of interest and are explored in this paper for the first time as a precursor to developing a greater understanding of the carbonation process in this material. The carbonation fronts obtained by XRD, loss on ignition, and FTIR all arose at similar depths, as these methods all identify the depth at which the calcium carbonate concentration is elevated with respect to the baseline (i.e., the maximum advancement of the carbonation front). In contrast, the phenolphthalein method underestimated the carbonation front considerably. The pH of the stabilized peat slurries method gave the depth at which leaching of calcium hydroxide and calcium ions occurred, rather than a carbonation depth, and exceeds the depths determined from the other techniques. Advantages and disadvantages of all techniques are discussed.

    Author Information:

    Duggan, Alan R.
    Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway,

    Goggins, Jamie
    Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway,

    Clifford, Eoghan
    Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway,

    McCabe, Bryan A.
    Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway,


    Stock #: GTJ20160223

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160223

    Author
    Title The Use of Carbonation Depth Techniques on Stabilized Peat
    Symposium ,
    Committee D18