Modelling the effects of waste components on cement hydration

R.J. van Eijk, Jos Brouwers

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    Abstract

    Ordinary Portland Cement (OPC) is often used for the Solidification/Stabilization (S/S) of waste containing heavy metals and salts. These waste componenents will precipitate in the form of insoluble compounds onto unreacted cement clinker grains preventing further hydration. In this study the long term effects of the presence of contaminants in solidified waste is examined by numerically simulating cement hydration after precipitation of metal salts on the surface of cement grains. A cement hydration model was extended in order to describe porewater composition and the effects of coating. Calculations were made and the strength development predicted by the model was found to agree qualitatively with experimental results found in literature. The complete model is useful in predicting the strength and leaching resistance of solidified products and developing solidification recipes based on cement.
    Original languageUndefined
    Title of host publicationWaste Materials in Construction. Science and Engineering of Recycling for Environmental Protection Proceedings of Waste Materials in Construction WASCON 2000, 31 May-2June. G.R. Woolley, J.J.J.M. Goumans and P.J. Wainwright, eds. WMS Vol. 1, Pergamon
    Place of PublicationHarrogate, England
    Pages685-694
    Number of pages10
    Publication statusPublished - 31 May 2000
    EventWASCON 2000, the 4th International Conference on the Science and Engineering of Recycling for Environmental Protection - Harrogate, UK
    Duration: 31 May 20002 Jun 2000

    Conference

    ConferenceWASCON 2000, the 4th International Conference on the Science and Engineering of Recycling for Environmental Protection
    Period31/05/002/06/00
    Other31 May - 2 June 2000

    Keywords

    • METIS-125327
    • IR-21577

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