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Open AccessArticle

The Effect of Silica Fume and Organosilane Addition on the Porosity of Cement Paste

1
Fachgebiet Technische Physik II/Polymerphysik, Institute of Physics, Technische Universität Ilmenau, 98684 Ilmenau, Germany
2
Department of Physics and Chemistry, Technical University of Cluj-Napoca, RO-400114 Cluj-Napoca, Romania
*
Authors to whom correspondence should be addressed.
Academic Editor: David Faux
Molecules 2020, 25(8), 1762; https://doi.org/10.3390/molecules25081762
Received: 19 March 2020 / Revised: 8 April 2020 / Accepted: 10 April 2020 / Published: 11 April 2020
(This article belongs to the Special Issue Fluids in Porous Media)
The present work systematically investigates the influence of silica fume and organosilane addition on the hydration dynamics and the capillary pore formation of a cement paste. The cement samples were prepared with two water-to-cement ratios with increasing amounts of silica fume and of (3-Aminopropyl)triethoxysilane (APTES) organosilane. Low-field 1H nuclear magnetic resonance (NMR) relaxation measurements were performed during the hydration of the samples and after hydration, in order to reveal the dynamics of water molecules and the pore distribution. Increasing concentrations of silica fume impact the perceived hydration dynamics through the addition of magnetic impurities to the pore solution. However, there is a systematic change in the capillary pore size distribution with an increase in silica fume concentration. The results also show that the addition of APTES majorly affects the hydration dynamics, by prolonging the dormancy and hardening stages. While it does not influence the pore size distribution of capillary pores, it prevents cyclohexane from saturating the capillary pores. View Full-Text
Keywords: portland cement; silica fume; APTES; organosilane; porosity; 1H NMR portland cement; silica fume; APTES; organosilane; porosity; 1H NMR
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MDPI and ACS Style

Crețu, A.; Mattea, C.; Stapf, S.; Ardelean, I. The Effect of Silica Fume and Organosilane Addition on the Porosity of Cement Paste. Molecules 2020, 25, 1762.

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