Jamming rheology of model cementitious suspensions composed of comb-polymer stabilized magnesium oxide particles

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机构：

[1] Murray, Lisa R.

[2] Erk, Kendra A.

来源：

Erk, K.A. (erk@purdue.edu) | 1600年 / John Wiley and Sons Inc卷 / 131期

关键词：

The colloidal microstructure of concentrated suspensions containing anionic comb-polymer-stabilized magnesium oxide (MgO) particles in water was analyzed by shear rheometry for indications of changes in particle microstructure based on particle size and comb-polymer usage. As the suspensions were sheared at different rates; jamming in the sheared MgO suspensions was observed as shear stress overshoots. The shear-induced evolution of the suspension's microstructure was strongly related to the perceived interactions between neighboring MgO particles in the suspension. In the jammed state; interactions are believed to be enhanced by the formation of entanglements between opposing comb-polymer side-chains. Steric repulsion between side-chains was lessened for large particles on account of their diameters; which further enabled side-chain entanglement during close particle contact under shear. Suspensions with relatively wide particle size distributions (0.5-400 μm) were theorized to form hydrocluster aggregates; while suspensions with narrower particle size distributions (0.5-40 μm) most likely resulted in networked microstructures under the influence of the chain entanglements from the adsorbed comb-polymer. © 2014 Wiley Periodicals; Inc;

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Journal article (JA)

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