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Hydration kinetics and gel morphology of C-S-H

Lookup NU author(s): Dr Enrico Masoero

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Abstract

Calcium-silicate hydrate (C-S-H) is the main binder in cement and concrete. It starts forming from the early stages of cement hydration and it progressively densifies as cement sets. C-S-H nanoscale building blocks form a cohesive gel, whose structure and mechanics are still poorly understood, in spite of its practical importance. Here we review a statistical physics approach recently developed, which allows us to investigate the C-S-H gel formation under the out-of-equilibrium conditions typical of cement hydration. Our approach is based on colloidal particles, precipitating in the pore solution and interacting with effective forces associated to the ionic environment. We present the evolution of the space filling of C-S-H with different particle interactions and compare them with experimental data at different lime concentrations. Moreover, we discuss the structural features of C-S-H in the mesoscale in terms of the scattering intensity. The comparison of our early stage C-S-H structures with small angle neutron scattering (SANS) experiments shows that long range spatial correlations and structural heterogeneties that develop in that early stages of hydration persist also in the hardened paste.


Publication metadata

Author(s): Ioannidou K, Masoero E, Levitz P, Pellenq RJM, Del Gado E

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures (CONCREEP 10)

Year of Conference: 2015

Pages: 565-573

Online publication date: 21/09/2015

Acceptance date: 01/01/1900

Publisher: ASCE

URL: https://doi.org/10.1061/9780784479346.069

DOI: 10.1061/9780784479346.069

Library holdings: Search Newcastle University Library for this item

ISBN: 9780784479346


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