Abstract
Blending of Portland cement with silica-rich materials leads to changes in composition of the hydrated cement and of its pore solution. Blends rich in SiO2 result in the absence of portlandite and the formation of more C-S-H with a lower Ca/Si ratio. At higher SiO2 additions also monocarbonate is unstable and strätlingite might form. Blending with very high quantities of SiO2 can lead to a drop of pH to 11 or below and thus to the destabilization of ettringite. However, not only the quantity of SiO2 in the system is critical but also its reactivity.
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Acknowledgments
The partial financial support of the Cement Clay Interaction (CI) experiment at Mont Terri is gratefully acknowledged. Thanks to G. Le Saout (Empa), M. Ben Haha, E. Wieland (PSI), and B. Schwyn (nagra) for helpful discussions.
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Lothenbach, B. (2013). Hydration of Blended Cements. In: Bart, F., Cau-di-Coumes, C., Frizon, F., Lorente, S. (eds) Cement-Based Materials for Nuclear Waste Storage. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3445-0_4
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DOI: https://doi.org/10.1007/978-1-4614-3445-0_4
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