Abstract The present study concerns the leaching of alkali ions in terms of leaching capacity and leaching rate. Tests were performed in two conditions: air-tight and aerated. As a result, it was found that the leaching capacity was strongly dependent on binder type rather than the W/C. 30% PFA and 60% GGBS had lower leaching capacity, compared to OPC. The pH of media was crucial to leaching rate. At 11.4 and 12.4 in the pH, alkali metallic and hydroxyl ions are mainly extracted from the specimen respectively. The alkali leaching converted the pH profile in the cement matrix. After the alkali leaching, the pH in the vicinity of the surface was even lower than in the inner matrix, where no influence of leaching reached. In an aerated condition, the pH of media was increased initially within several hours, but decreased to 8.31–9.08, presumably due to a precipitation of leached ions.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Risk of environmental contamination arising from concrete structures, Part III: Alkali leaching


    Contributors:
    Jung, M. S. (author) / Hwang, J. P. (author) / Kim, J. H. (author) / Lee, C. K. (author) / Ann, K. Y. (author)

    Published in:

    Publication date :

    2014-12-19


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Risk of environmental contamination arising from concrete structures, Part III: Alkali leaching

    Jung, M. S. / Hwang, J. P. / Kim, J. H. et al. | Online Contents | 2015


    Risk of environmental contamination arising from concrete structures, Part II: Toxic substance

    Jung, M. S. / Hwang, J. P. / Kim, J. H. et al. | Springer Verlag | 2014


    Risk of environmental contamination arising from concrete structures, Part II: Toxic substance

    Jung, M. S. / Hwang, J. P. / Kim, J. H. et al. | Online Contents | 2015


    Risk of environmental contamination arising from concrete structures, Part I: CO2 emission

    Hwang, J. P. / Jung, M. S. / Lee, C. K. et al. | Springer Verlag | 2014


    Risk of environmental contamination arising from concrete structures, Part I: $ CO_{2} $ emission

    Hwang, J. P. / Jung, M. S. / Lee, C. K. et al. | Online Contents | 2015