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Hydration Kinetics and Gel Morphology of C-S-H

TitleHydration Kinetics and Gel Morphology of C-S-H
Publication TypeConference Proceedings
Year of Publication2015
AuthorsIoannidou K, Masoero E, Levitz PE, Pellenq RJean-Marc, Del Gado E
EditorHellmich C, Pichler B, Kollegger J
SponsorRILEM American Society of Civil Engineers, Engn Mech Inst American Society of Civil Engineers, French Natl Res Ctr Lafarge
Conference Name10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete StructuresCONCREEP 10
VolumeCONCREEP 10: MECHANICS AND PHYSICS OF CREEP, SHRINKAGE, AND DURABILITY OF CONCRETE AND CONCRETE STRUCTURES
Pagination565-573
Date PublishedSep-17-2015
PublisherAmerican Society of Civil Engineers
Conference LocationSeptember 21–23, 2015, Vienna, AustriaReston, VA
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.

DOI10.1061/978078447934610.1061/9780784479346.069
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