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Modelling the effects of waste components on cement hydration
1University of Twente, Department of Civil Engineering and Management, Enschede, The Netherlands. r.j.vaneijk@sms.utwente.nl
Waste Management (New York, N.Y.)
|March 31, 2001
Summary
This study numerically simulates cement hydration in solidified waste. The model predicts strength development and leaching resistance, aiding in developing effective cement-based waste stabilization recipes.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Ordinary Portland Cement (OPC) is widely used for waste solidification/stabilization (S/S).
- Heavy metals and salts in waste can precipitate on cement grains, hindering hydration and long-term stability.
- Understanding contaminant effects on cement hydration is crucial for effective waste management.
Purpose of the Study:
- To numerically simulate cement hydration in the presence of precipitated contaminants.
- To extend existing cement hydration models to account for pore water composition and cement grain coating.
- To predict the long-term performance of solidified waste.
Main Methods:
- Numerical simulation of cement hydration.
- Extension of a cement hydration model to include contaminant effects.
- Analysis of pore water composition and cement grain surface precipitation.
Main Results:
- The model qualitatively predicted strength development consistent with experimental data.
- The simulation successfully incorporated the impact of precipitated metal salts on cement hydration.
- The developed model provides insights into long-term strength and leaching behavior.
Conclusions:
- The extended cement hydration model accurately predicts the performance of solidified waste.
- The model is valuable for developing optimized cement-based solidification recipes.
- This approach enhances the prediction of strength and leaching resistance in contaminated waste.