01157586

Component

https://doi.org/10.3141/2141-08

http://scholar.google.com...rtis&publication_year=2010

The performance and properties of cement-based materials can potentially be altered by the addition of nano-sized inclusions. In this study, the effect of chemically nonreactive anatase TiO2 nanoparticles on early-age hydration of cement was investigated. First, the effects of different percentage addition rates of TiO2 to portland cement on early-age behavior were examined through isothermal calorimetry and measurements of chemical shrinkage. On the basis of accelerations in hydration observed in TiO2 portland cements, additional experiments were performed with tricalcium silicate (C3S), the main strength-giving mineral component of portland cement, to determine whether the influence of TiO2 could be adequately described by a kinetic model that relies on boundary nucleation theory. Comparison of the experimental results and the modeling showed that (a) an increase in addition rates of TiO2 accelerates the rate of cement hydration and (b) the heterogeneous nucleation effect rather than the dilution effect was dominant. The result of the boundary nucleation model reinforces the concept of the heterogeneous nucleation effect and demonstrates that the surface area provided by nano-TiO2 particles increases the rate of hydration reaction. This research forms the foundation for future studies aimed at optimizing photocatalytic and other nanoparticle-containing cements.

01157583

NANO10-0026

English

pp 41-46

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309142762

Print

Figures (5) ; References (22) ; Tables (3)

Hydration; Nanostructured materials; Nucleation; Portland cement; Shrinkage; Tricalcium silicate

Anatase titanium dioxide; Calorimetry; Early age concrete; Early cement hydration

Materials; I32: Concrete

TRIS, TRB

May 25 2010 1:34PM

• Atomic Force Acoustic Microscopy to Measure Nanoscale Mechanical Properties of Cement Pastes
• Atomic Force Microscopy Examinations of Mortar Made by Using Water-Filled Lightweight Aggregate
• Comparative Study of the Effects of Microsilica and Nanosilica in Concrete
• Homogenization Model Examining the Effect of Nanosilica on Concrete Strength and Stiffness
• Influence of Micro- and Nanoclays on Fresh State of Concrete
• Influence of Nano-SiO2 Addition on Microstructure and Mechanical Properties of Cement Mortars for Ferrocement
• Micro- and Nanoscale Characterization of Effect of Interfacial Transition Zone on Tensile Creep of Ultra-High-Performance Concrete
• Nanoindentation of Alkali-Activated Fly Ash
• Nanostructure and Microstructure of Cement Concrete Incorporating Multicementitious Composites
• Nanotechnology: New Tools to Address Old Problems
• Observation of Cement Paste Microstructure Evolution
• Performance of Cement Systems with Nano-SiO2 Particles Produced by Using the Sol–Gel Method
• Photocatalytic Properties of Cement-Based Plasters and Paints Containing Mineral Pigments
• Seeding Effect of Nano-CaCO3 on the Hydration of Tricalcium Silicate
• Small Changes Can Make a Great Difference
• The Fresh State: From Macroscale to Microscale to Nanoscale