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Kinetic mechanisms and activation energies for hydration of standard and highly reactive forms of β–dicalcium silicate (C2S)

Lookup NU author(s): Dr Enrico Masoero

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Abstract

The activation energy for hydration of β–C2S paste was measured as a func- tion of hydration time using a calorimetric method and was found to depend on the surface area and reactivity of the powder as well as on the addition of sodium silicate. For neat paste made with standard β–C2S (similar to that found in portland cement), the activation energy is approximately 32 kJ/mol and is constant with time. For neat paste made with reactive β–C2S (calcined at lower temperature and with high surface area), the activation energy is about 55 kJ/mol and is also constant with time. This large difference in activation energy reflects a difference in the rate-controlling step for hydration. After in- vestigating the effects of sodium silicate and synthetic calcium–silicate–hydrate on the kinetics, we hypothesize that the lower activation energy represents C2S dissolution, while the higher value represents nucleation and growth of hydration product.

Publication metadata

Author(s): Thomas JJ, Ghazizadeh S, Masoero E

Publication type: Article

Publication status: Published

Journal: Cement and Concrete Research

Year: 2017

Volume: 100

Pages: 322-328

Print publication date: 01/10/2017

Online publication date: 02/08/2017

Acceptance date: 08/06/2017

Date deposited: 13/06/2017

ISSN (print): 0008-8846

Publisher: Elseiver

URL: https://doi.org/10.1016/j.cemconres.2017.06.001

DOI: 10.1016/j.cemconres.2017.06.001

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