Influence of TiO2 Nanoparticles on Early C3S Hydration

By Bo Yeon Lee, Kimberly E. Kurtis. SP-267: Nanotechnology of Concrete: The Next Big Thing is Small, 2009

205 citations recorded by the source corpus.

The effect of nanoanatase titanium dioxide (TiO2) powder on early-age hydration kinetics of tricalcium silicate (C3S) was investigated. Isothermal calorimetry was performed on C3S pastes with 0%, 5%, 10%, and 15% of TiO2 addition by weight, and two mathematical models—the Avrami (or JMAK) model and the boundary nucleation model (BN model)—were fitted to the data. For all of the mixes, the addition of TiO2 increased the peak reaction rate, and increased the degree of hydration at 12 and 24 h. The rate of hydration of 10% and 15% TiO2 pastes were accelerated, while the 5% TiO2 paste was delayed, lengthening the induction period as compared with the control paste. The model fits demonstrate that the BN model captures the kinetics of the reaction better, particularly in the deceleration period, than the Avrami model. This is related to the ratio of rate parameters (kB/kG) of the BN model, that the increasing ratio gives a more unsymmetrical shape of a rate curve. The increase in kB/kG with TiO2 addition at 5%, 10%, and 15% suggests that hydration product is formed on or near the surfaces of TiO2 particles, as well as on the C3S surface. These results demonstrate that the addition of TiO2 nanoparticles accelerates the early hydration by providing additional nucleation sites, forming the foundation for future optimization of photocatalytic and other nanoparticle-containing cements.

Subfields: Civil and Structural Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/4adaaad638bff8a231b16ca6080ded0f09e54854

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In Civil and Structural Engineering

1. D. Macphee
2. E. Gartner
3. V. Vishwakarma
4. D. Ramachandran
5. J. Provis
6. F. Winnefeld
7. A. Palomo
8. B. Lothenbach

Citations in the corpus

• Green Concrete mix using solid waste and nanoparticles as alternatives – A review (2018, background): “TiO2 nanoparticles accelerate the rate of hydration of cement and thus enhance the strength of the concrete because of its filler effects [98].”
• A physico-chemical basis for novel cementitious binders (2011, background): “Rates of heterogeneous nucleation also vary in a very nonlinear way with supersaturation but the probability of nucleation also depends on the nature of the surfaces already present, and can be increased greatly by the presence of suitable surfaces [27] (e.”