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Le Châtelier’s conjecture: Measurement of colloidal eigenstresses in chemically reactive materials

TitleLe Châtelier’s conjecture: Measurement of colloidal eigenstresses in chemically reactive materials
Publication TypeJournal Article
Year of Publication2018
AuthorsAbuhaikal M, Ioannidou K, Petersen T, Pellenq RJean-Marc, Ulm F-J
JournalJournal of the Mechanics and Physics of Solids
Volume112
Pagination334 - 344
Date PublishedMar-2018
ISSN00225096
KeywordsPoromechanics; Colloidal stresses; Cement-based materials; Expansion; Shrinkage
Abstract

Volume changes in chemically reactive materials, such as hydrating cement, play a critical role in many engineering applications that require precise estimates of stress and pressure developments. But a means to determine bulk volume changes in the absence of other deformation mechanisms related to thermal, pressure and load variations, is still missing. Herein, we present such a measuring devise, and a hybrid experimental-theoretical technique that permits the determination of colloidal eigenstresses. Applied to cementitious materials, it is found that bulk volume changes in saturated cement pastes at constant pressure and temperature conditions result from a competition of repulsive and attractive phenomena that originate from the relative distance of the solid particles- much as Henry Louis Le Chatelier, the father of modern cement science, had conjectured in the late 19th century. Precipitation of hydration products in confined spaces entails a repulsion, whereas the concurrent reduction in interparticle distance entails activation of attractive forces in charged colloidal particles. This cross-over from repulsion to attraction can be viewed as a phase transition between a liquid state (below the solid percolation) and the limit packing of hard spheres, separated by an energy barrier that defines the temperature-dependent eigenstress magnitude. (C) 2017 Elsevier Ltd. All rights reserved.

Fig. 1. Pressure vessel measurement device for volume changes under constant pressure…

Fig. 2. Bulk Volume Change measurement results under drained and fluid saturated…

Fig. 3. Eigenstress Scaling: (a) Normalized eigenstress (|σ*|/max|σ*|) vs

Fig. 4. Eigenstress interpretation: (a) volume fractions vs

URLhttps://linkinghub.elsevier.com/retrieve/pii/S0022509617309985
DOI10.1016/j.jmps.2017.12.012
Short TitleJournal of the Mechanics and Physics of Solids
Full Text

Fig. 1. Pressure vessel measurement device for volume changes under constant pressure…

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