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Effect of silica particle size on the formation of calcium silicate hydrate using thermal analysis

Maddalena, Riccardo ORCID: 2019. Effect of silica particle size on the formation of calcium silicate hydrate using thermal analysis. Thermochimica Acta 672 , pp. 142-149. 10.1016/j.tca.2018.09.003

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Calcium silicate hydrate (C-S-H) is made by mixing calcium hydroxide (portlandite), silica and water at two calcium oxide to silica (C/S) ratios, using nanosilica and silica fume. We investigate how silica particle size influences the rate and extent of formation of C-S-H at room temperature by isothermal calorimetry, thermal analysis, Raman spectroscopy and X-ray diffraction. Rate of reaction increases as silica particle size decreases, and is five times greater with nanosilica than with silica fume. Final composition depends only on initial C/S ratio. Compositions at 28 days are estimated from thermogravimetric and X-ray diffraction data. There is a weak maximum in the reaction rate of nanosilica pastes about 20–30 h after mixing. The overall kinetics are well described by a simple exponential (first-order) reaction model. The early-time reaction rate around the rate maximum is described by an Avrami model.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0040-6031
Date of First Compliant Deposit: 28 November 2018
Date of Acceptance: 2 September 2018
Last Modified: 21 Dec 2022 16:14

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