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Modelling the effects of waste components on cement hydration

Authors
  • van Eijk, R.J.
  • Brouwers, H.J.H.
Type
Book
Journal
Waste Management
Publication Date
Jan 01, 2000
Volume
1
Pages
685–694
Identifiers
DOI: 10.1016/S0713-2743(00)80078-1
ISBN: 978-0-08-043790-3
Source
Elsevier
License
Unknown

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.

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