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

Thomas, JJ; Ghazizadeh, S; Masoero, E; (2017) Kinetic mechanisms and activation energies for hydration of standard and highly reactive forms of beta-dicalcium silicate (C2S). Cement and Concrete Research , 100 pp. 322-328. 10.1016/j.cemconres.2017.06.001. Green open access

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Abstract

The activation energy for hydration of β–C2S paste was measured as a function 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 investigating 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.

Type: Article
Title: Kinetic mechanisms and activation energies for hydration of standard and highly reactive forms of beta-dicalcium silicate (C2S)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cemconres.2017.06.001
Publisher version: https://doi.org/10.1016/j.cemconres.2017.06.001
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & technology, technology, construction & building technology, materials science, multidisciplinary, materials science, hydration, kinetics, dicalcium silicate, activation energy, tricalcium silicate, portland-cement, saturated solutions, phase-stability, temperature, strength, CA2SIO4, water
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10049775
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