Abstract The present study concerns the immobilisation of hexavalent chromium (Cr (VI)) ions in the cement matrix. Both the water-soluble and acid-soluble Cr (VI) ions in cement were measured using the spectrophotometer. As a result, the concentration of water-soluble Cr (VI) in cement ranged from 12.3 to 19.0 mg/kg-cem, and the dissolution of acid soluble Cr (VI) was strongly dependent on the pH of solvent, ranging from 172.4 to 318.2 mg/kg-cem. Simultaneously, the influence of cement hydration on the Cr (VI) solubility was investigated. After a cement hydration for 28 days, the water-soluble Cr (VI) was sharply decreased to about 2.0 mg/kg-cem, whilst no particular change in the acid-soluble Cr (VI) was observed. The reduction of water-soluble Cr (VI) may be attributed to a physical adorption of Cr (VI) ions in the cement matrix then to immobilise them, rather than chemical reaction with C3A or ettringite, being postulated in previous studies.


    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 II: Toxic substance


    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 :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    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 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 III: Alkali leaching

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


    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