Measurement and modeling of the surface potential evolution of hydrated cement pastes as a function of degradation

Journal of Colloid and Interface Science
I PointeauNathalie Coreau

Abstract

Hydrated cement pastes (HCP) have a high affinity with a lot of (radio)toxic products and can be used as waste confining materials. In cementitious media, elements are removed from solution via (co)precipitation reactions or via sorption/diffusion mechanisms as surface complexation equilibria. In this study, to improve the knowledge of the surface charge evolution vs the degradation of the HCP particles, two cements have been studied: CEM-I (ordinary Portland cement, OPC) and CEM-V (blast furnace slag and fly ash added to OPC). Zeta potential measurements showed that two isoelectric points exist vs HCP leaching, i.e., pH. Zeta potential increases from -17 to +20 mV for pH 13.3 to pH 12.65 (fresh HCP states) and decreases from 20 to -8 mV for pH 12.65 to 11 (degraded HCP states). The use of a simple surface complexation model of C-S-H, limited in comparison with the structural modeling of C-S-H in literature, allows a good prediction of the surface potential evolution of both HCP. Using this operational modeling, the surface charge is controlled by the deprotonation of surface sites (>SO(-)) and by the sorption of calcium (>SOCa(+)), which brings in addition a positive charge. The calcium concentration is controlled by portlandi...Continue Reading

References

Sep 21, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Bo JönssonH Wennerström

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Citations

Dec 15, 2010·Journal of Colloid and Interface Science·Marta MedalaAndré Nonat
Nov 20, 2009·Journal of Colloid and Interface Science·Andrew S KinselaIan White
Aug 14, 2012·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Gareth Wynn-JonesMichael P Hofmann
Apr 9, 2014·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Gareth Wynn-JonesMichael P Hofmann

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