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Appl. Sci. 2018, 8(4), 487; https://doi.org/10.3390/app8040487

Viscoelastic Behavior of Polymer-Modified Cement Pastes: Insight from Downscaling Short-Term Macroscopic Creep Tests by Means of Multiscale Modeling

1
F.A. Finger-Institute for Building Material Engineering, Bauhaus-Universität Weimar, 99423 Weimar, Germany
2
Institute for Mechanics of Materials and Structures, TU Wien—Vienna University of Technology, 1040 Vienna, Austria
3
BATir Department, Université libre de Bruxelles (ULB), 1050 Bruxelles, Belgium
Current address: Coudraystraße 11 A, 99423 Weimar, Germany.
*
Author to whom correspondence should be addressed.
Received: 28 February 2018 / Revised: 16 March 2018 / Accepted: 21 March 2018 / Published: 23 March 2018
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Abstract

Adding polymers to cementitious materials improves their workability and impermeability, but also increases their creep activity. In the present paper, the creep behavior of polymer-modified cement pastes is analyzed based on macroscopic creep tests and a multiscale model. The continuum micromechanics model allows for “downscaling” the results of macroscopic hourly-repeated ultra-short creep experiments to the viscoelastic behavior of micron-sized hydration products and polymer particles. This way, the increased creep activity of polymer-modified cement pastes is traced back to an isochoric power-law-type creep behavior of the polymers. The shear creep modulus of the polymers is found (i) to be two orders of magnitude smaller than that of the hydrates and (ii) to increase considerably with increasing material age. The latter result suggests that the creep activity of the polymers decreases with the self-desiccation-related decrease of the relative humidity inside the air-filled pores of cement paste. Furthermore, its decrease is most likely related to the penetration of cementitious hydrates into compliant polymer agglomerates. View Full-Text
Keywords: polymer modification; cement paste; creep; micromechanics; viscoelasticity polymer modification; cement paste; creep; micromechanics; viscoelasticity
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Göbel, L.; Königsberger, M.; Osburg, A.; Pichler, B. Viscoelastic Behavior of Polymer-Modified Cement Pastes: Insight from Downscaling Short-Term Macroscopic Creep Tests by Means of Multiscale Modeling. Appl. Sci. 2018, 8, 487.

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