Water dynamics of Portland cement paste with nano-additives

Researchers have recently shown that the concentration of nano-silica (NS) governs the early-age hydration process in Portland cements.

Grey paste.
A recent study provides new insights into the water dynamics of Portland cement paste. Source: M.Dörr & M.Frommherz – stock.adobe.com. -

Early-age hydration kinetics of Portland cement with nano-additives such as nano-silica (NS) was examined using quasielastic neutron scattering (QENS). Cement pastes with different ratios of Portland cement to NS were prepared. The concentration of the NS played a major role in controlling the free and bound water during the hydration of the cement paste.

Influence of the NS concentration on the degree of hydration

Additionally, the effects of metakaolin (MK) with NS in Portland cements revealed that MK acts as a retarder by decreasing the bounding water capacity during the early age of hydration. An increase in the concentration of NS affected the degree of hydration by reducing the amount of free and mobile water in the gel pores when compared to Portland cement paste.

The study is published in: Journal of Materials Science  March 2019, Volume 54, Issue 6, pp 4710–4718.

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