Effect of Polyacrylamide on Rheology of Fresh Cement-Pastes (2015-05)¶
10.1016/j.cemconres.2015.05.012
, Baumann Robert, Schmitz Marc, Radler Michael,
Journal Article - Cement and Concrete Research, Vol. 76, pp. 98-106
Abstract
In this paper, we study the effects of polyacrylamide (PAM) on both aqueous solutions and fresh cement pastes. Our solution viscosity and hydrodynamic radii measurements in various solutions suggest that calcium ions lead to a cross-linking of anionic PAM and to the formation of PAM micro-gels. Our adsorption measurements show that themajority ofthese micro-gels adsorb on cement grains whereas our rheological measurements on cement pastes suggest that these micro-gels are able to adsorb simultaneously on several cement grains and bridge them increasing therefore the macroscopic yield stress of the suspension. Finally, we show that the contribution of PAM to yield stress is very sensitive to shear history, as the paste structure seems to progressively lose its ability to rebuild with each shearing or re-mixing cycle. Wesuggest that this feature could find its origin in the progressive flattening of the micro-gels at the surface of the cement grains.
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BibTeX
@article{bess_baum_schm_radl.2015.EoPoRoFCP,
author = "Hela Bessaies-Bey and Robert Baumann and Marc Schmitz and Michael Radler and Nicolas Roussel",
title = "Effect of Polyacrylamide on Rheology of Fresh Cement-Pastes",
doi = "10.1016/j.cemconres.2015.05.012",
year = "2015",
journal = "Cement and Concrete Research",
volume = "76",
pages = "98--106",
}
Formatted Citation
H. Bessaies-Bey, R. Baumann, M. Schmitz, M. Radler and N. Roussel, “Effect of Polyacrylamide on Rheology of Fresh Cement-Pastes”, Cement and Concrete Research, vol. 76, pp. 98–106, 2015, doi: 10.1016/j.cemconres.2015.05.012.
Bessaies-Bey, Hela, Robert Baumann, Marc Schmitz, Michael Radler, and Nicolas Roussel. “Effect of Polyacrylamide on Rheology of Fresh Cement-Pastes”. Cement and Concrete Research 76 (2015): 98–106. https://doi.org/10.1016/j.cemconres.2015.05.012.